Miele COFFEE SYSTEM CVA 4068 Technical Information Download Page 19

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Technical Information

CVA 4062/CVA 4066/CVA 4068 Coffee Systems

4 Service

4.1

Removing the Appliance from a Cabinet

1.  Turn off the water supply (CVA 4066).
2.  Disconnect the appliance from power.
3.  Open the door.
4.  Remove the containers and drip tray.
5.  Remove the four retaining screws (Figure 010-1, Item 1).

Figure 010-1:

Removing the Appliance from a Cabinet

6.  Slide the appliance out of its cabinet.
7.  Disconnect the appliance from the water supply (CVA 4066).
8.  Disconnect the power connections.

Summary of Contents for COFFEE SYSTEM CVA 4068

Page 1: ...TECHNICAL INFORMATION CVA 406x Coffee Systems 2012 Miele USA ...

Page 2: ...ner Panel 24 021 Coffee Hot Water Dispenser 25 2 Function 26 2 1 Adjusting the Dispenser Height 26 3 Fault Repair 26 3 1 Coffee or Espresso Too Cold 26 3 2 Milk Froth Unsatisfactory or Sputtering 26 025 Door Outer Panel Control Display Electronic 28 2 Function 29 2 1 Optical Interface MDU 29 2 2 Control Display Electronic EPWZ N5 29 2 3 Touch Controls 29 3 Fault Repair 29 3 1 Diagnostic Support Ca...

Page 3: ...ting the Grinder Setting 46 2 2 Filling Ground Coffee 46 4 Service 46 4 1 Grinder M25 Removal 46 050 Flow Thru Heaters 50 2 Function 51 2 1 Steam System 51 4 Service 51 4 1 Removing the Coffee Hot Water Heater 2R1 51 4 2 Removing the Temperature Limiter Fuse Temperature Sensor from the Coffee Hot Water Heater 53 4 3 Removing the Steam Heater 1R1 54 4 4 Removing the Temperature Limiter Temperature ...

Page 4: ...28 Too Much Ground Coffee in Brew Unit 82 3 8 F41 EEPROM Faulty Data Fault 83 3 9 F42 Line Frequency Not Registered 83 3 10 F47 No Communication Between Control and Power Electronics 83 3 11 F73 Brew Unit Fault 83 3 12 F74 Ceramic Valve Fault 84 3 13 F76 Fault during Pressing in Brew Unit 85 3 14 F77 Ceramic Valve Initialization Fault 85 3 15 F80 Coffee Hot Water Heater 2R1 Not Heating 85 3 16 F81...

Page 5: ...8 Component Layout 16 Figure D 4 CVA 4066 Component Layout 17 Figure 010 1 Removing the Appliance from a Cabinet 19 Figure 010 2 CVA 4066 Plumbing 20 Figure 010 3 CVA Feet Adjustment 21 Figure 010 4 CVA Mounting Locations 21 Figure 010 5 Door Hinge Adjustment 22 Figure 021 1 Dispenser Height Adjustment 26 Figure 025 1 Optical Interface for Diagnostic Support and Program Updating 29 Figure 025 2 Ri...

Page 6: ... Components on Steam Heater 55 Figure 050 10 Temperature Regulating Components on Steam Heater 56 Figure 051 1 CVA Water Path Overview 58 Figure 051 2 Coffee Water Path 59 Figure 051 3 Hot Water Path 60 Figure 051 4 Hot Milk Path 60 Figure 051 5 Milk Froth Path 61 Figure 051 6 Support Plate Retaining Screws 62 Figure 051 7 Rinsing and Hot Water Solenoids 63 Figure 051 8 Hot Water Solenoid 63 Figur...

Page 7: ...r Retaining Screws 103 Figure 080 3 Water Inlet Valves 104 List of Tables Table C 1 Technical Data 13 Table 030 1 Switch Cam Settings 37 Table 070 1 Software IDs 79 Table 070 2 X Servings until Descaling versus Water Hardness 88 Table 070 3 Customer Programming Settings 93 Table 070 4 Service Programming Settings 94 Table 070 5 Service Mode 99 Table 070 6 Brew Unit Positions 100 ...

Page 8: ...switched off voltage may exist on some components After work has been completed as a matter of standard practice a visual as well as an operational check should be performed Note Prior to starting service or repair work remove all containers and the drip tray with the spill guard grid from the appliance 2 Risk of Burning or Scalding Some components may be very hot such as heaters Also some compone...

Page 9: ...emaker kit not included with the coffee system with either copper or plastic tubing will work efficiently when installed correctly The length of this tubing should not exceed 5 feet 1 5 meters A shutoff valve with customer access should be provided with a plumbed CVA 4066 coffee system Water pressure for proper operation must be between 14 5 and 145 pounds per square inch If the water pressure is ...

Page 10: ...pt for the brew unit beans container stainless steel milk container and lid and main dispenser cover Regular cleaning in the dishwasher is important so that components do not clog over time B Modification History When Who What 7 2 2012 Jessica Naples Tech service bulletins added 2 1 2012 Jessica Naples Tech service bulletins added 1 8 2010 Jessica Naples Revision 11 6 2009 Jessica Naples Revision ...

Page 11: ...t in Tall unit X X X Wall unit Dresser unit X X X Door hinge Left Left Left Dimensions Appliance dimensions Height 17 6 17 6 17 6 Width 22 0 22 0 22 0 Depth 18 1 20 1 20 1 Depth with door open 41 7 41 7 41 7 Niche dimensions for built in appliances Height 17 6 17 8 17 6 17 8 17 6 17 8 Width 22 0 22 4 22 0 22 4 22 0 22 4 Depth 19 7 21 6 21 6 ...

Page 12: ...X Pumps 2 2 2 Stainless steel flow thru heaters 2 2 2 Height adjustable coffee dispensing nozzle for cup height 2 6 5 7 2 6 5 7 2 6 5 7 Hot water spout X X X System lock X X X Power consumption in standby mode 1W 1W 1W Can be combined with built in dish warmer No No No Electrical connection Rated load 1 2kW 1 2kW 1 2kW Fuse rating 10A 10A 10A Voltage 120V 120V 120V Frequency 60Hz 60Hz 60Hz No of p...

Page 13: ... 1 1 Advice sheet Coffee residue 1 1 1 Wiring diagram 1 1 1 Allen keys for niche 4 4 4 Drink sizes See Section 070 4 1 and Table 070 3 Drink temperatures At flow thru heater See Section 070 4 1 and Table 070 3 At dispenser 1 Espresso 187 5 F 187 5 F 187 5 F Coffee 187 5 F 187 5 F 187 5 F Table C 1 Technical Data 1 Measure the temperature half an inch 1 centimeter below the dispenser not in the cup...

Page 14: ... On Off touchpad 7 Door grip 2 Display 8 Hot water dispenser 3 Left arrow to scroll through program options 9 Lighting 4 OK touchpad to confirm selected program options and save settings 10 Drip tray 5 Right arrow to scroll through program options 11 Main dispenser height adjustable 6 Hot Water touchpad 12 Stainless steel milk container ...

Page 15: ...ew of Appliance 1 Main switch 7 Water tank 2 Storage drawer 8 Brew unit 3 Ground coffee chute 9 Waste container 4 Grind adjustment lever 10 Main dispenser connector connects the brew unit to the main dispenser 5 Beans container 11 Stainless steel milk container 6 Drip tray with no spill grid for transport ...

Page 16: ...ch 7 Control display electronic EPWZ 24 Steam solenoid 8 On Off switch 25 Coffee hot water NTC 9 Coffee hot water heater temperature limiter 26 Coffee hot water heater 10 Dispensing area light 27 Coffee hot water heater fuse 11 Dispensing monitoring switch 28 Steam heater 12 Dispensing area light 29 Steam heater NTC 13 Brew unit drive with 2 brew unit position switches and 1 brew unit presence swi...

Page 17: ... 8 On Off switch 26 Rinsing solenoid 9 Coffee hot water heater temperature limiter 27 Coffee hot water NTC 10 Dispensing area light 28 Coffee hot water heater 11 Dispensing monitoring switch 29 Coffee hot water heater fuse 12 Dispensing area light 30 Steam heater 13 Float switch water container maximum level 31 Steam heater NTC 14 Brew unit drive with 2 brew unit position switches and 1 brew unit ...

Page 18: ...Technical Information 18 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 010 Housing ...

Page 19: ...ply CVA 4066 2 Disconnect the appliance from power 3 Open the door 4 Remove the containers and drip tray 5 Remove the four retaining screws Figure 010 1 Item 1 Figure 010 1 Removing the Appliance from a Cabinet 6 Slide the appliance out of its cabinet 7 Disconnect the appliance from the water supply CVA 4066 8 Disconnect the power connections ...

Page 20: ...se burns and damage to surrounding areas Allow an additional depth of 2 for CVA 4066 installations see Figure 010 2 Figure 010 2 CVA 4066 Plumbing 4 2 1 Installation Procedure Note Make sure power is not supplied to the appliance while installation or maintenance work is being preformed Disconnect the power supply to the work area by unplugging the appliance and tripping the circuit breaker The co...

Page 21: ...ck into the cabinet and center it If the cabinet has 19mm side walls mark the four holes for mounting See Figure 010 4 Items 1 and 2 for location 7 Take the appliance out of the cabinet and carefully drill four holes at the screw marks 1 16 2mm diameter 3 16 4 5mm 8 Push the appliance back into the cabinet until fully seated 9 Open the front of the appliance and turn the 4 screws tightening them a...

Page 22: ...g the Door Hinges The door hinges can be adjusted if the door cannot be opened easily To adjust the door sideways turn the screw as shown in Figure 010 5 Item 1 To adjust the door forwards or backwards turn the screw as shown in Figure 010 5 Item 2 Figure 010 5 Door Hinge Adjustment ...

Page 23: ...Technical Information 23 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 011 Exterior Side Panels ...

Page 24: ...Technical Information 24 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 020 Door Inner Panel ...

Page 25: ...Technical Information 25 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 021 Coffee Hot Water Dispenser ...

Page 26: ...s Note Measure the temperature half an inch 1 centimeter below the dispenser not in the cup The temperature should be 187 F 3 F 1 Pre warm cups 2 Set the temperature for coffee and espresso to maximum see Section 070 4 1 and Table 070 3 3 Set the grinding setting at least one level lower finer 4 Increase the grind ground coffee amount see Section 070 4 1 and Table 070 3 5 Activate pre brewing see ...

Page 27: ...spenser back in the machine Cause Rubber stoppers in the dispenser nozzles were not removed when the dispenser was cleaned Remedy Remove both rubber stoppers from the dispenser nozzles Clean the stoppers and the nozzles see the operating manual Advise the customer about the cleaning instructions in the operating manual Cause Milk container inserted incorrectly If the milk container is crooked or n...

Page 28: ...Technical Information 28 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 025 Door Outer Panel Control Display Electronic ...

Page 29: ...ication cable and controls the messages in the display 2 3 Touch Controls Select a program using the and touchpads See Figure D 1 Items 3 and 5 Confirm selections with the OK touchpad Figure D 1 Item 4 Use Back to go back to the previous screen 3 Fault Repair 3 1 Diagnostic Support Cannot Establish a Connection Symptom The connection cannot be made via the optical interface Cause Diagnostic suppor...

Page 30: ...ile Receiver Display Faulty See DTD for XIC 2000 3 7 Machine Runs Automatically and Chirps When the Door is Opened Cause Faulty grounding of the fascia panel The ground spring in the upper door hinge does not have contact with the stainless steel panel Remedy Note The fascia panel is coated with Cleansteel and is thus nonconductive so measure resistance on the edge of the panel 1 Use an ohmmeter t...

Page 31: ...ction from the control display electronic blue wire see Figure 025 3 Item A 11 Remove the stainless steel cover from the front of the main dispenser Figure 025 3 Hose and Wire Connections 12 Release the plastic elbow with water line from its guide in the upper right hand corner of the control display electronic s cover near Item 2 in Figure 025 4 13 Release all hoses and wires from their guides in...

Page 32: ...tem 1 17 Disconnect the power electronic connection Figure 025 5 Item 2 18 Remove the control display electronic cover Figure 025 5 Control Display Electronic Cover and Power Electronic Connection 19 Disconnect all electrical connections from the control display electronic see Figure 025 6 Items 1 2 and 3 20 Carefully remove the housing containing the control display electronic 21 Unsnap at the bo...

Page 33: ...icroswitch from the housing 4 3 Dispensing Area Light 1H3 2H3 Removal Note Refer to Figure D 2 or D 3 Items 10 and 12 for component location 1 Remove the side cover 2 Remove the central cover 3 Unsnap the appropriate lighting unit from its holder 4 Disconnect the wiring harness 4 4 Door Removal 1 Disconnect the appliance from power 2 Turn off the water supply CVA 4066 3 Open the door 4 Remove the ...

Page 34: ...crews Note The Teflon hoses are different colors to prevent crossing the lines during reassembly Warning In order to avoid possible water system faults e g clogging or blocking of valves grease oil or other slip lubricants should never be used when assembling and installing water system parts ...

Page 35: ...Technical Information 35 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 030 Drive Brew Unit ...

Page 36: ...4 microswitches Figure 030 1 The drive system and actuator disk are in the neutral position when the left hand actuator of the double cam is activating the upper microswitch Figure 030 1 Item 3 This is the initial default position of the brew unit When the brew unit is correctly installed the brew unit present microswitch Figure 030 1 Item 2 is activated After the brew unit has been activated if o...

Page 37: ...Switching Cam Ground Quantity Compensation Microswitch The further the switch cam advances the greater the ground quantity in the brew unit Five different settings can be registered Position Microswitch Position Switching Process 1 In front of the first cam Off 2 On the first cam Off On 3 Between the two cams Off On Off 4 On the second cam Off On Off On 5 Behind the second cam Off On Off On Off Ta...

Page 38: ...ate during the next grinding cycle Because the maximum ground quantity compensation is 1 6 seconds this adjustment can be repeated up to 8 times 2 1 3 Brew Unit Drive Home Position If the brew unit is in the home position the left cam of the double cam element activates the top microswitch the bottom microswitch is not switched Figure 030 5 The pawl is in the home position Figure 030 6 Figure 030 ...

Page 39: ...closes the drain valve The ground coffee is slightly compressed and brewed Figure 030 7 Compressing Position Rear View Figure 030 8 Compressing Position Front View 2 1 5 Brew Unit Drive Drain Position After the coffee is brewed the drive moves back until the first cam of the double cam element activates the bottom microswitch and the top microswitch is switched Figures 030 9 and 030 10 The tension...

Page 40: ...rain Position Front View 3 Fault Repair 3 1 Coffee Grounds Next to the Brew Unit Symptom After approximately 5 coffee servings there is a large amount of coffee grounds next to the brew unit Cause The grind amount compensation is set to maximum See the function description for grind amount compensation Section 030 2 1 2 ...

Page 41: ...Table 070 3 4 Service 4 1 Brew Unit Drive M26 Removal 1 Remove the appliance from its cabinet See Section 010 4 1 2 Carefully remove the top cover retaining screws The larger T20 screws have metal washers underneath that can easily be misplaced 3 Remove the top cover 4 Remove the three service door retaining screws see Figure 030 11 Item 1 Figure 030 11 Service Door Screws 5 Release the wiring har...

Page 42: ...from the power electronic 9 Open the appliance door 10 Remove all containers from the appliance 11 Release the brew unit Push in on the handle and slide it to the left Remove the brew unit from the machine See Figure 030 13 Figure 030 13 Brew Unit Removal 12 Remove the five T10 screws securing the brew unit drive see Figure 030 14 Item 1 1 Grind amount compensation microswitch 2 Brew unit drive ...

Page 43: ...three service door retaining screws see Figure 030 11 Item 1 5 Release the wiring harness black cable connecting the control and power electronics from its guide 6 Open the service door See Figure 030 12 7 Disconnect the microswitch electrical connection see Figure 030 12 Item 1 for location 8 Release the microswitch from its retaining tabs to remove 4 3 Removing the Brew Unit Position Microswitch...

Page 44: ...8 Coffee Systems 6 Open the service door See Figure 030 12 7 Unsnap the cover containing the microswitches and the double cam element 8 Disconnect the appropriate microswitch s wiring harness 9 Release the microswitch from its retaining tabs to remove ...

Page 45: ...Technical Information 45 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 040 Grinder ...

Page 46: ...uch as decaffeinated coffee 1 Pull the container for the ground coffee out of the appliance and lift the funnel lid Figure 040 2 Item 1 2 Place one spoonful of ground coffee into the funnel Figure 040 2 Item 2 using the supplied spoon and close the lid 3 Push the container into the appliance and close the door Figure 040 2 Ground Coffee Funnel and Lid For more information see Preparing drinks Coff...

Page 47: ...ase the wiring harness black cable connecting the control and power electronics from its guide 6 Open the service door See Figure 040 4 Figure 040 4 Service Door Open 7 Open the appliance door 8 Remove the bean container 9 Remove the five T10 screws securing the bean container guide see Figure 040 5 Item 1 ...

Page 48: ...ver handle see Figure 040 6 Figure 040 6 Adjustment Lever Handle 11 Remove the bean container guide and disconnect the wiring harness 12 Slide the adjustment lever all the way to the right see Figure 040 7 13 Remove the three grinder retaining screws T10 see Figure 040 7 Item 1 Remove the three rubber bushings and brass rods underneath the screws ...

Page 49: ...040 7 Item A and remove the chute Figure 040 7 Grinder Retaining Screws 15 Remove the grinder halfway 16 Disconnect all electrical connections to the grinder 17 Carefully remove the grinder from the appliance Note When re installing the grinder first install the rubber bushings in their notches on the grinder then slide the brass rods into place ...

Page 50: ...Technical Information 50 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 050 Flow Thru Heaters ...

Page 51: ... the appliance must heat up first to produce steam The steam system is turned on by default 4 Service 4 1 Removing the Coffee Hot Water Heater 2R1 1 Remove the appliance from its cabinet See Section 010 4 1 2 Carefully remove the top cover retaining screws The larger T20 screws have metal washers underneath that can easily be misplaced 3 Remove the top cover 4 Remove the three service door retaini...

Page 52: ...r heater water line connections arrows Figure 050 3 10 Remove the four heater bracket retaining screws T10 see Figure 050 3 Item 1 11 Remove the heater bracket assembly Figure 050 3 Coffee Hot Water Heater 12 Unscrew the temperature sensor temperature limiter and fuse from the heater see Figure 050 4 Items 1 2 and 3 13 Disconnect the heater electrical connection yellow green wire sometimes secured...

Page 53: ...ter see Section 050 4 1 Figure 050 5 Temperature Regulating Components on Coffee Hot Water Heater 2 To remove the temperature limiter unscrew its mounting bracket from the heater Disconnect the electrical connections and unsnap the temperature limiter from the mounting bracket 3 To remove the fuse unscrew its mounting bracket from the heater Disconnect the electrical connections Remove the T20 scr...

Page 54: ...t can easily be misplaced 3 Remove the top cover 4 Remove the three service door retaining screws see Figure 050 6 Item 1 Figure 050 6 Service Door Screws 5 Release the wiring harness black cable connecting the control and power electronics from its guide 6 Open the service door See Figure 050 7 Figure 050 7 Service Door Open Showing Heaters 7 Remove the two spring clips from the heater water conn...

Page 55: ...miter and fuse from the heater see Figure 050 9 Items 1 2 and 3 11 Disconnect the heater electrical connection yellow green wire sometimes secured with a screw Figure 050 9 Temperature Regulating Components on Steam Heater Warning In order to avoid possible water system faults e g clogging or blocking of valves grease oil or other slip lubricants should never be used when assembling and installing...

Page 56: ...imiter unscrew its mounting bracket from the heater Disconnect the electrical connections and unsnap the temperature limiter from the mounting bracket 3 To remove the temperature sensor unscrew it from the heater and disconnect its wiring harness 4 To remove the fuse unscrew its mounting bracket from the heater Disconnect the electrical connections Remove the T20 screw securing the mounting bracke...

Page 57: ...Technical Information 57 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 051 Pumps Solenoids Flow Meters ...

Page 58: ...ew 1 Steam heater 10 Coffee hot water heater 2 Steam pump 11 Ceramic valve 3 Water tank 12 Pressure relief valve 4 Flow meter 13 Drain valve 5 Coffee hot water pump 14 Decompression vessel 6 Milk container 15 Brew unit 7 Hot milk dispenser 16 Milk froth dispenser 8 Rinsing solenoid 17 Drip tray 9 Hot water solenoid 18 Large cleaning container ...

Page 59: ...ffee puck drops into the waste container and the residual water runs via the drain valve 13 into the drip tray 17 Figure 051 2 Coffee Water Path 3 Water tank 12 Pressure relief valve 4 Flow meter 13 Drain valve 5 Coffee hot water pump 15 Brew unit 10 Coffee hot water heater 17 Drip tray 2 1 3 Water Path Hot Water The highlighted path in Figure 051 3 details the flow of water for hot water producti...

Page 60: ...ess When hot milk is selected the steam pump 2 draws water from the water tank 3 The water is then pumped through the steam heater 1 The steam is now sent through the ceramic valve 11 after which it mixes with milk from the milk container 6 The hot milk is dispensed via the hot milk dispenser 7 into the cup Any remaining vapor is drained out through the decompression vessel 14 Figure 051 4 Hot Mil...

Page 61: ...pump 2 will draw water from the water tank 3 The water is then pumped through the steam heater 1 The steam is now sent through the ceramic valve 11 after which it mixes with milk from the milk container 6 The milk froth is dispensed via the milk froth dispenser 16 into the cup Any remaining vapor is drained out through the decompression vessel 14 Figure 051 5 Milk Froth Path 1 Steam heater 11 Cera...

Page 62: ...4 Service 4 1 Hot Water Solenoid Y61 Removal 1 Remove the appliance from its cabinet See Section 010 4 1 2 Remove the two screws securing the support plate one T10 and one T20 see Figure 051 6 Item 1 3 Open the support plate Figure 051 6 Support Plate Retaining Screws ...

Page 63: ... connections see arrows Figure 051 8 5 Remove the solenoid 6 Disconnect all solenoid electrical connections Figure 051 8 Hot Water Solenoid Warning In order to avoid possible water system faults e g clogging or blocking of valves grease oil or other slip lubricants should never be used when assembling and installing water system parts 1 Rinsing solenoid 2 Hot water solenoid ...

Page 64: ...stems 4 2 Rinsing Solenoid Y62 Removal 1 Remove the appliance from its cabinet See Section 010 4 1 2 Remove the two screws securing the support plate one T10 and one T20 see Figure 051 9 Item 1 3 Open the support plate Figure 051 9 Support Plate Retaining Screws ...

Page 65: ...ater connections see Figure 051 11 5 Remove the solenoid 6 Disconnect all solenoid electrical connections Figure 051 11 Rinsing Solenoid Warning In order to avoid possible water system faults e g clogging or blocking of valves grease oil or other slip lubricants should never be used when assembling and installing water system parts 1 Rinsing solenoid 2 Hot water solenoid ...

Page 66: ... metal washers underneath that can easily be misplaced 3 Remove the top cover 4 Remove the three service door retaining screws see Figure 051 12 Item 1 Figure 051 12 Service Door Screws 5 Release the wiring harness black cable connecting the control and power electronics from its guide 6 Open the service door See Figure 051 13 Figure 051 13 Service Door Open 7 Remove the two bottom rear panel reta...

Page 67: ...ure 051 15 Item 1 11 Disconnect the two pump electrical connections 12 Remove the four pump retaining screws T10 see Figure 051 15 Item 2 13 Remove the pump 14 Pull the silicone hose off of the pump see arrow Figure 051 15 15 Release the temperature limiter retainer using needlenose pliers and remove the temperature limiter See Figure 051 15 Item 3 16 Unscrew the pressure relief valve see Figure 0...

Page 68: ...elease the wiring harness black cable connecting the control and power electronics from its guide 6 Open the service door See Figure 051 13 7 Remove the two bottom rear panel retaining screws 8 Remove the bottom rear panel 9 The steam pump is shown in Figure 051 14 Item 2 10 Disconnect the pump electrical connections 11 Remove the four pump retaining screws T10 see Figure 051 16 Item 1 12 Remove t...

Page 69: ...Section 010 4 1 2 Carefully remove the top cover retaining screws The larger T20 screws have metal washers underneath that can easily be misplaced 3 Remove the top cover 4 Remove the three service door retaining screws see Figure 051 12 Item 1 5 Release the wiring harness black cable connecting the control and power electronics from its guide 6 Open the service door See Figure 051 13 7 Remove the ...

Page 70: ...10 Disconnect the flow meter wiring harness 11 Remove the flow meter from its plastic support See Figure 051 18 Item 2 Figure 051 18 Flow Meter 1 and Plastic Support 2 Warning In order to avoid possible water system faults e g clogging or blocking of valves grease oil or other slip lubricants should never be used when assembling and installing water system parts ...

Page 71: ... If necessary remove the bottom rear panel retaining screws and bottom rear panel 9 Pull off the drain tube from the decompression vessel See Figure 051 19 Item 1 10 Remove the 2 T10 screws securing the decompression vessel See Figure 051 19 Item 2 Remove the vessel Figure 051 19 Decompression Vessel and Ceramic Valve 4 7 Ceramic Valve Removal 1 Remove the appliance from its cabinet See Section 01...

Page 72: ...is located at Figure 051 19 Item 3 10 Remove the 2 spring clips from the 2 water lines at the front of the ceramic valve See Figure 051 20 Item 1 Disconnect the water lines Figure 051 20 Ceramic Valve Removed from Machine 11 Remove the 2 T10 screws securing the ceramic valve to the side panel screws are located next to the solenoid mounting bracket 12 Free the ceramic valve then remove the 2 sprin...

Page 73: ...Technical Information 73 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 060 Containers Drip Tray Accessories ...

Page 74: ...der will be displayed when the machine is turned on In CVA 4066 systems the water can be filled automatically with fresh cold water See Section 060 2 2 2 Note Never add hot water or any other liquids except cold water to the water tank Do not use deionized or mineral water Mineral water leads to heavy calcium buildup in the machine that can cause damage 2 2 1 Manually Filling the Water Tank 1 Open...

Page 75: ...nfirm with OK Note When Plumbed is set to Off the water tank must be filled manually with fresh tap water Refer to Section 2 2 1 for filling instructions When Plumbed is set to On the water tank is automatically filled 2 3 Filling the Beans Container The beans container is to be filled with fresh coffee or espresso beans No flavored coffee beans or caramelized pre treated or ground coffee should b...

Page 76: ...ect Rinse the milk pipework and touch OK 4 Select Start and touch OK 5 When prompted fill the large plastic container with cold water to the max mark and then press OK 6 When prompted again fit the lid from the stainless steel milk container on the large plastic container then turn it counterclockwise until it engages with the container Insert it in the coffee system where the stainless steel milk...

Page 77: ...ontainer Note It is important to keep the neck and seals of this container clean Any soiling can lead to malfunction of the milk container 1 Clean the stainless steel milk container and lid by hand with soap and hot water 2 Rinse the handle under running water and then clean it thoroughly with a damp cloth to remove all milk residue 3 If the milk pipework in the milk container lid is clogged clean...

Page 78: ...Technical Information 78 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 070 Electronic Modules ...

Page 79: ...559550 CVA 4066 07559590 Table 070 1 Software IDs 3 Fault Repair 3 1 F1 Coffee Hot Water NTC 2R30 Short Circuited Cause Coffee hot water NTC 2R30 short circuited Remedy 1 Check the connection leads 2 Replace the connection leads if necessary 3 Check the temperature sensor via service mode Note The approximate resistance values of this NTC are 100kΩ at 77 F 25 C 5 5kΩ at 212 F 100 C and 1kΩ at 320 ...

Page 80: ...Note The approximate resistance values of this NTC are 100kΩ at 77 F 25 C 5 5kΩ at 212 F 100 C and 1kΩ at 320 F 160 C 4 Check the resistance of the temperature sensor at different temperatures and compare to the above values 5 Replace the temperature sensor if necessary 3 4 F4 Steam NTC 1R30 Open Circuited Cause Steam NTC 1R30 open circuited Remedy 1 Check the connection leads 2 Replace the connec...

Page 81: ...ter Cause Coffee hot water pump 2M7 defective Remedy 1 See Coffee Hot Water Pump Removal Section 051 4 3 2 Install a new coffee hot water pump Cause Water paths need to be descaled Remedy 1 Descale the appliance see the operating instructions 2 Replace the coffee hot water heater including the brew unit hose and spout Cause Brew unit jammed Remedy Follow the remedy procedure outlined in F73 Brew U...

Page 82: ...mp Removal Section 051 4 3 Cause Water paths need to be descaled Remedy 1 Descale the appliance see the operating instructions 2 Replace the coffee hot water heater including the brew unit hose and spout Cause Brew unit jammed Remedy Follow the remedy procedure outlined in F73 Brew Unit Fault Page 83 Warning In order to avoid possible water system faults e g clogging or blocking of valves grease o...

Page 83: ... Remedy 1 Check the wiring harness between the control electronic and the power electronic 2 Replace the wiring harness if necessary 3 11 F73 Brew Unit Fault Figure 070 1 Brew Unit Positioning Microswitches After the brew unit is activated if one of the two microswitches has not been activated within approximately 10 seconds fault code F73 is indicated Cause Brew unit jammed Remedy 1 Switch off th...

Page 84: ...nnection leads 2 Replace the connection leads if necessary 3 Check the microswitch via the service mode see Table 070 5 in Section 070 4 3 4 If the microswitch is electrically defective replace the microswitch 5 If the microswitch is mechanically defective cam worn down replace the cam 6 If the cam is not available as a separate part replace the entire brew unit drive See Brew Unit Drive M26 Remov...

Page 85: ... ceramic valve in the service mode see Table 070 5 in Section 070 4 3 2 Replace the ceramic valve if necessary refer to Section 051 4 8 Cause Ceramic valve reference switch S51 1 defective Remedy Replace the ceramic valve See Section 051 4 8 3 15 F80 Coffee Hot Water Heater 2R1 Not Heating Cause Coffee hot water heater 2R1 not heating Remedy 1 Test the coffee hot water heater in service mode 2 Rep...

Page 86: ...erature is greater than 356 F 180 C Remedy If the steam heater is on steadily and operating temperature limiter F1 5 replace the power electronic see Section 070 4 4 3 19 F94 Water Intake Fault Cause During commissioning the appliance water intake shutoff valve was closed Remedy 1 Shut the appliance off at the main switch 2 Open the shutoff valve 3 Confirm the fault message with OK 4 Switch on the...

Page 87: ...are incorrectly installed Remedy Check the contact spring connectors 3 21 Empty Drip Tray Message Even Though Drip Tray Is Not Full Cause The inserted drip tray or drip tray overflow is occasionally not detected The drip tray contact springs are dirty or covered with film rinse aid from the dishwasher The contacts in the machine are corroded The spring pressure of the contacts is insufficient Reme...

Page 88: ...Servings until Descaling versus Water Hardness Remedy Descale the appliance see the operating instructions 3 22 Empty Waste Container Message But Waste Container Is Not Full Cause If the waste container has not been emptied in the past 48 hours the message Empty waste container will automatically appear Remedy No fault Advise the customer of this automatic message Cause The waste container was emp...

Page 89: ... re install jets in the main dispenser 3 26 Fit Cover over Central Spout Message Displayed Cause The stainless steel cover is missing from the main dispenser Remedy Install or re install the stainless steel cover over the main dispenser then confirm with OK 4 Service 4 1 Customer Programming Mode Initial requirements Switch the appliance on Accessing 1 Press or until Settings appears in the top ro...

Page 90: ...rman english espanol Spanish francais French hrvatski Croatian italiano Italian magyar Hungarian nederlands Dutch norsk Norwegian polski Polish português Portuguese slovenscina Slovene Slovenian suomi Finnish svenska Swedish türkce Turkish griechisch Greek russisch Russian ukrainisch Ukranian chinesisch Chinese Time Display On The clock is permanently displayed On for 60 seconds When the machine i...

Page 91: ...he amount will be saved for all future preparations When the maximum amount of water or milk is reached the machine will automatically stop dispensing Coffee 30 250 mL 125mL Cappuccino Espresso 30 250 mL 60mL Milk froth 1 60 s 15 s Latte Macchiato Espresso 30 250 mL 60mL Milk froth 1 60 s 15 s Hot milk 1 80 s 45 s Milk froth 1 60 s 42 s Hot water 30 250 mL 125mL Amount of coffee Espresso 1 7 4 Gri...

Page 92: ...em is switched on The appliance uses two heating systems so that milk froth hot milk and coffee espresso can be prepared at the same time Off The steam system is switched off If milk froth or hot milk is rarely required then the steam system can be switched off in order to save energy If milk froth or hot milk is selected while the steam system is switched off then the appliance must heat up first...

Page 93: ... Demo program The appliance can be used but will not heat The message Demo mode for dealer only or Demo mode is active for dealer only will be displayed if demo mode has been activated Press OK to confirm the message Off Demo mode is off Factory Default All settings All settings that can be modified in customer programming only will be restored to their factory settings The language will remain an...

Page 94: ... remain demo mode will stay switched on and the fault memory will not be cleared Service Model Variants Plumbed Water Supply With hard plumbing The machine is hooked up to plumbing 1 W out hard plumbing The machine is not hooked up to plumbing Dish Warmer W dish warmer A dish warmer is connected W out dish warmer No dish warmer Descale 2 Reset Release the descale lock Back Go back w out lifting de...

Page 95: ...o select the function 2 After selecting a function touch or to scroll to the desired option See Table 070 5 Press OK to select the option 3 To go back to the previous menu touch or until Back is marked Press OK Service Function Option Description ID Number EPX ID number ID number of control electronic Mat no var The material number of the variant file for the control display electronic is displaye...

Page 96: ...is moved into the home position Closed position The ceramic valve is moved into the closed position Hot milk position The ceramic valve is moved into the hot milk position Pressure release position 1 The ceramic valve is moved into pressure release position 1 Milk froth pressure release The ceramic valve is moved into the milk froth pressure release position Milk froth The ceramic valve is moved i...

Page 97: ...rrent temperature at the steam heater will be displayed Only switch on the heater briefly so that it does not get too hot and thus melt the fuse Off The steam heater is switched off 2R1 Coffee Hot Water Heater On The coffee hot water heater heats The current temperature at the coffee hot water heater will be displayed Only switch on the heater briefly so that it does not get too hot and thus melt ...

Page 98: ...is empty Press OK to end the process To ensure error free circulation always fill the system before initial operation Sensor Test B3 14 Bean Container 0 The bean container is empty or not inserted 1 The bean container is inserted and full S12 1 Water Container Minimum Level Switch 0 The water container is empty or not inserted 1 The water container is inserted and full S12 2 Drip Tray Level Switch...

Page 99: ... but not locked in place 1 The brew unit is inserted and locked in place S87 4 Waste Container Presence Switch 0 The waste container is not inserted 1 The waste container is inserted S87 5 Ground Coffee Funnel Presence Switch 0 The ground coffee funnel is open 1 The ground coffee funnel is closed S87 6 Dispenser Presence Switch 0 The dispenser is missing or was not pushed in to the switching point...

Page 100: ...n End position top 1 1 Closed Closed End position bottom Table 070 6 Brew Unit Positions 4 4 Power Electronic EPL N4 Removal 1 Remove the appliance from its cabinet See Section 010 4 1 2 Remove the three top rear panel retaining screws two T10s one T20 3 Remove the top rear panel 4 Disconnect all electrical connections from the power electronic 5 Remove the four power electronic retaining screws T...

Page 101: ...Technical Information 101 CVA 4062 CVA 4066 CVA 4068 Coffee Systems 080 Water Intake CVA 4066 Only ...

Page 102: ...ed in series in the water path One solenoid is controlled by the power electronic and one by the control display electronic Power electronic N4 control display electronic N5 If one electronic is defective the second solenoid will be closed by the other electronic Water container monitoring with 2 float switches S12 1 S12 3 The bottom float switch monitors the minimum level in the water container T...

Page 103: ...om its cabinet See Section 010 4 1 2 Remove the top cover retaining screws 3 Remove the top cover 4 Remove the service door retaining screws see Figure 080 2 Item 1 Figure 080 2 Service Door Retaining Screws 5 Release the wiring harness black cable connecting the control and power electronics from its guide 6 Open the service door 7 Unscrew the brass elbow from the rear of the coffee system see ar...

Page 104: ...he valve on the right is the primary valve valve on the left the secondary valve See Figure 080 3 Item 1 9 Remove the two water inlet valve retaining screws T20s with washers see Figure 080 3 Item 2 10 Pull off the hose see Figure 080 3 Item 3 Figure 080 3 Water Inlet Valves 1 Water inlet valve electrical connections 2 Water inlet valve retaining screws 3 Hose ...

Page 105: ...ass one half of the AC sine wave to the heater continuously either the coffee or steam heater This means that the affected heater is being fed with 50 voltage as long as the machine is plugged in and the main power switch is on Diagnosis The machine must be plugged in main power switch on and in standby mode clock display visible only Remove the top panel if the machine has been in standby mode fo...

Page 106: ...nge suddenly back to 12 00 without any warning or user intervention This applies specifically to the CVA 4062 and CVA 4066 models Other functions of the coffee system are not affected This is a software issue To resolve it please apply the firmware update provided in the latest version of the MDU software V4 5 11 19 2009 If you experience any difficulty when connecting to the CVA with the optical ...

Page 107: ...n the following pages As of November 2010 the following part numbers apply 07735300 Cover including conversion instructions 07735320 Central spout connection 07879151 Central spout 07873460 Removable milk pipework Danger Safety glasses must be worn for this procedure Before starting any service work the machine must be disconnected from the power supply Even with the machine switched off voltage m...

Page 108: ...tem 2 6 Remove the central cover 7 Remove the screw securing the coupling piece Figure 1 Item 3 Figure 1 8 Remove the screw securing the hose holder Figure 2 Item 3 9 Remove the hose holder 10 Pull off the hose from the coupling piece Figure 2 Item 2 11 Remove the coupling piece 12 Remove the screw securing the sensor holder Figure 2 Item 1 13 Remove the milk container sensor 14 Pull off the milk ...

Page 109: ... fascia piece from the central spout 16 Remove the central spout from the front 17 Slide the height adjustment mechanism upwards 18 Remove the 2 retaining spring clips Figure 3 Item 1 19 Pull out the hoses with ground connections 20 Unclip the microswitch with its housing from below Figure 3 Item 2 and remove it ...

Page 110: ...CVA 4068 Coffee Systems Figure 3 21 Remove the 4 screws securing the holder Figure 4 Item 1 22 Disconnect the connection to the left light Figure 4 Item 2 Figure 4 23 Remove the holder as well as the complete height adjustment mechanism Figure 5 ...

Page 111: ...igure 5 24 Remove the 2 screws securing the central spout connection Figure 6 Item 1 25 Remove the central spout connection Figure 6 26 Install the new central spout connection Figure 7 in position and carefully tighten the 2 retaining screws Figure 6 Item 1 by hand only ...

Page 112: ...gure 4 Item 1 28 Reconnect the connection to the left light Figure 4 Item 2 29 Remove the 2 O rings from the old central spout connection and slide them onto the 2 hose connections Figure 8 Item 1 Figure 8 30 Re install the ground connections Figure 9 Item 1 on the hose connections 31 Install the hose connections on the central spout connection and re install the 2 retaining spring clips Figure 9 ...

Page 113: ...l connections in their guides 34 To ensure that the new cover can be secured the screw boss Figure 10 Item 1 must be shortened by exactly 15 mm using diagonal cutters or an appropriate tool Particular care should be take to work precisely as otherwise the cover will be pressed out or retracted Figure 10 35 To ensure that height adjustment is possible use diagonal cutters or an ...

Page 114: ...Install the new cover and re install the 5 retaining screws Figure 1 Item 2 42 Install the new removable milk pipework in the new cover 43 Install the right cover and re install the 3 retaining screws Figure 1 Item 1 44 Install the milk container 45 Slide the new central spout upwards from the front until clicking of the microswitch can be heard 46 Re install the front stainless steel fascia piece...

Page 115: ...at this is a new part 8 CVA 406X Hot Milk Temperatures In some cases customers prefer to have hotter milk temperatures when making cappuccino or latte macchiato The temperature of the hot milk froth should be 54 C 4 C 122 136 F If the temperatures are not in this range replace the coupling connector part number 07735341 23 24 on the parts diagram In order to get the best temperature results when d...

Page 116: ...L 125mL 9 Understanding CVA 40xx Temperature Fuses The CVAs have temperature fuses on both the coffee and steam heaters These fuses are SODs single operation devices designed to protect the system from a runaway heater scenario The heaters are controlled by NTC feedback to the electronic and energized via a TRIAC TRIACS are power transistors designed to switch high current AC devices on and off As...

Page 117: ...offee 12 7Ω and be sure to check both ends of the element against the heater case ground This should read infinity If either of these tests fail the heater is bad The heater may have caused the electronic to fail 2 Disconnect the heater and see if voltage is present with the machine turned off via the electronic not the mains switch If voltage is present the electronic is bad 3 Ohm out the NTC sen...

Page 118: ...Technical Information 118 CVA 4062 CVA 4066 CVA 4068 Coffee Systems ...

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Miele COFFEE SYSTEM CVA 4068, Technical Information, Page: 19 / 118

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