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Synesso MVP, Technical Manual

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Synesso MVP Technical Manual Download Page 36

 

36

 

1 Group MVP Hydra Electrical Box

 

1

 

13

 

6

 

5

 

8

 

7

 

ELECTRICAL SYSTEM 

 

Electrical Box Components Continued:

 

5. 

Pump Relays: 

Switch high voltage onto the pump motors. 

 

6. 

Element Breaker: 

Disconnects voltage from all heating elements.

 

7. 

Electronics Power Switch:

 

Turns the machine off and on. If the machine is plugged into an electrical 

source, the switch will be illuminated when in the 

“

On

” 

position.

 

8. 

Conduit Tube: 

Protects power and signal lines from abrasion and other damage. (Not Shown)

 

9. 

Main Electronics Board, MVP: 

Controls all automated systems throughout the machine. 

 

10. 

Ribbon Cable: 

Connects the hand held display to the Main Electronics Board. 

 

11. 

Level Probe Wires and Connectors: 

Connect level probes to power board and ground. 

 

12. 

Temperature Probe Connections: 

Connect temp probes to display board. 

 

13. 

Steam Tank Element Relays: 

Switch high voltage onto the steam tank heating elements.

 

14.

 

Heat Sink:  Fanned Aluminum Block: 

Dissipates heat produced by the element relays. Located on lid. 

Sealed with silicon to protect against water penetration.

 

15.

 

Flow Meter Wires: 

Main Electronics board to Flow Meters

 

16.

 

Pump Relay Connections: 

connects electronics to pump relays

 

17.

 

Fuse:  

2 amp, 250 Volt1 

Fuse:  

2 amp, 250 Volt

 

18.

 

USB Type B Connector: 

Used for connecting a computer and installing firmware updates

 

Summary of Contents for MVP

Page 1: ...eattle WA 98108 USA Tel 1 206 764 0600 Fax 1 206 764 0601 Ordering Parts parts synesso com Information info synesso com www synesso com MVP MVP HYDRA TECHNICAL MANUAL VERSION 2020 1 3 Group MVP Last update September 2020 ...

Page 2: ... 42 Hot Water Tap 41 42 Auto Backflushing Machine 42 Error Codes 43 Error Troubleshooting Flow Charts 44 50 Menu Level 2 Settings 51 58 Access Menu Level 2 51 Save Lockout 51 Programs Activate Deactivate 51 Temperature Fahrenheit Celsius 52 Line Pressure Boost System 52 53 Brew Steam Offsets 53 54 System Clock 55 Heating Elements Activate Deactivate 55 Power Save Mode 56 Error Log 57 58 Return to ...

Page 3: ...n all hoses 8 Flexible ID drain hose hose clamp attached Fitting 1 4 male NPT x 90 x 3 8 Compression if not CE Accessory Package Portafilters per customer specification blind basket Synesso 3 oz 90ml shot glass 4oz jar cleaning detergent 58 4mm tamper 4 rubber leg pads Electrical plugs are ONLY included on CSA Certified machines Canada For all other machines the owner of the machine must purchase ...

Page 4: ...n Brew coffee tanks are hydrostatically tested to 375 psi Steam tanks are pressure tested to 75 psi The electrical system is subject to an electrical withstand test of 1 20 kV AC for 1 sec ond with a 7 mA limit IMPORTANT Information for Synesso Espresso Machines DISCONNECT FROM POWER BEFORE SERVICING Read the entire manual before operating this machine Steam and condensation from the steam wand di...

Page 5: ... directions ensure that the machine is switched off at the electrical box and the machine is unplugged Depressurizing the Steam Tank 1 Turn off the element circuit breaker located under the machine 2 Open the steam valve by moving the steam actuator lever forward 3 The steam tank is depres surized when the steam gauge reads zero Note the steam gauge is rated 0 60 psi Depressurizing the Brew Tanks ...

Page 6: ... steam valve seat Wrenches 2x11 32 1 4 5 16 3 8 2x7 16 1 2 2x9 16 5 8 11 16 3 4 12mm 17mm Adjustable wrenches Medium size 1 1 4 opening and Small for tight spots Pliers Channel Lock Standard pliers and Side Cutters Philips Head Screwdrivers 2 short 2 long and 1 Flat Head Screwdrivers 2 short 2 medium length 1 medium 0 medium A large flat head screwdriver or small flat nail puller to use as a pry b...

Page 7: ... Valves Thermal Overload Switch with Manual Reset Brew and Water Control Valves In addition to the standard 2 Year Plus Warranty Synesso will cover the following items under a Limited 5 year Warranty Steam Valve Actuator Machine Body Machine Frame Sight Glass Heating Elements Wire Harness Flow Meters Copper Tubes Brass Fittings Temperature Probes Lifetime Warranty on Group Head Actuator Assemblies...

Page 8: ...ruction installation and or use of products for certain purposes which may vary from area to area While Synesso attempts to assure that its products comply with such codes it cannot guarantee compliance and cannot be responsible for how the product is used or installed Synesso s liability is limited to the purchase price of the product and shall not be held liable for damages that extend beyond th...

Page 9: ...r tighten Turn incoming water ON and check for leaks Synesso machines require a minimum of 50 PSI 3 5 bar of line pressure at 30 gal 120 L per hour to have the auto fill system for the steam tank functioning properly Please ensure that the incoming water meets this requirement or contact Synesso for alternative methods of boosting water pressure NOTE Synesso sells a Euro hose adapter hose and fitt...

Page 10: ...elow 208v to optimize machine recovery time Buck boost transformers come in different sizes Please choose the ap propriate one for your machine if required 1 and 2 Group Machines require a 1 0 KVA transformer 3 Group Machines require a 1 5 KVA transformer SPECIAL ELECTRICAL INFORMATION FOR EMC COMPLIANT MACHINES CE FOR EUROPE AND OTHER LOCATIONS To comply with EMC Electromagnetic Compatibility reg...

Page 11: ...ater supply Water treat ment requirements will vary and it is important to use a system designed to match the needs of your specific area Water filtration systems require periodic maintenance including cartridge or filter replacement Prop er filtration and service is vital to the function of the machine and the quality of the espresso served Follow the instructions provided by your water treatment...

Page 12: ...12 INSTALLATION DIMENSIONS ...

Page 13: ...ifferent installation processes and require ments Please read below for details Model Specific Color Coding Depending on the MVP Series model and number of groups color coded zip ties will be present on the wa ter lines electrical cords and pump motors The colors are as follows Group 1 Grey Group 2 Purple Group 3 Brown Water inlet for the steam tank Pink Optional Line Boost System Red Wherever the...

Page 14: ...TS INSTALLATION MVP Pump Motor Wiring For the MVP machines the power cord to the pump motor is connected directly to the motor To connect the power cord Secure the ring terminal on the green grounding wire to the frame of the motor using the green screw Insert the spade connector of the white wire to the upper terminal Insert the spade connector of the black wire to the lower terminal Blank spade ...

Page 15: ...er routes directly to the single pump assembly MVP Hydra Manifold Steam Tank Line Pink Zip Tie is Matched Group 1 Pump Grey Zip Tie is Matched Group 2 Pump Purple Zip Tie is Matched Group 3 Pump Brown Zip Tie is Matched Pressure Regulators MVP Hydras come with line pressure regulators built into the bypass pump assemblies MVP machines do not come standard with a line pressure regulator but it can ...

Page 16: ... to the drain box allows the technician easy access to all water control valves on the water inlet right side and to the level probes and thermal switches on the left side For the technician to access the steam valve the Upper Side Panel must be removed When removing the Upper Side Panel from the espresso machine Remove the 2 side panel mounting bolts completely Each bolt is threaded into a plate ...

Page 17: ...eached 4 Bleed the group heads of air Hold each brew group handle left until the corresponding display reads M shift each group head handle left momentarily see pictures below allow the group to run until there is a steady flow of water Shift each group head right to turn off 5 Wait until the steam tank has stopped filling and the level in the sight glass reads at least full Turn the heating eleme...

Page 18: ...e achieved MVP Hydra machines have a separate ex pansion valve and pressure gauge for each group present MVP machines have one expansion valve for the entire brew system Each expansion valve is factory set to bleed off pressure at 11 12 bar If the needle rises above 12 bar on the pressure gauge the expansion valve should be adjusted to bleed off pressure near 11 12 bar so that the maximum pressure...

Page 19: ... outwards on the black knob Turn the knob clockwise to raise pressure and counterclockwise to lower pressure Press the cap back in when done Recommended preinfusion pressure is 3 5 bar 3 Shift the group handle to the left twice more to reach the third full pressure stage 4 While observing the brew pressure gauge adjust the pump adjustment screw To adjust loosen the lock nut on the screw Using a fl...

Page 20: ...structions for the program M MP or VP that you wish to brew with See below on how to change from program to program Hold handle LEFT to change the Operation Mode from M Manual to MP Manual Program to VP Volumetric Program MVP vs MVP Hydra Brewing MVP machines allow for two different brew pressures line pressure preinfusion and full pump pressure with only the pump pressure being adjustable Brewing...

Page 21: ...brew a shot in MP mode fol low the instructions below 1 Select the desired settings and program you wish to brew with Shift the group top handle momentarily to the right to cycle through the available programs The programs will be indicated by numbers 1 6 in differ ent positions on the shot timer See pages 40 and 41 for instructions on programming 2 With the portafilter prepared for brewing and en...

Page 22: ...displayed on each shot timer 2 Shift the group top handle momentarily right to cycle to the program you wish to save to 3 Once the program number or position you wish to save to is displayed shift the group top handle mo mentarily to the left to save The shot timer display will flash three times to indicate it has been saved Repeat steps 2 and 3 on each group and for each program you wish to save ...

Page 23: ...the last brewing function Turning on save mode hold any brew group handle right for 2 5 seconds Shifting thru the 6 available programs momentary presses of the brew group handle to the right Saving momentarily pressing the brew group handle left from within save mode Saving again to additional program locations on the same or different groups Exiting save mode hold any brew group handle right for ...

Page 24: ...n deactivate the steam wand If you are using your hand to help determine the temperature it will feel about as hot as you can stand without burn ing yourself Milk thermometers are also an excellent way to determine the temperature of the milk Caution Do not overheat the milk and scald it Scalded milk should not be used 8 Remove the wand from the milk purge with steam and wipe clean immediately aft...

Page 25: ...r the brew boiler goes through the pump and the water for the steam boiler travels through a separate line to the steam tank fill valve The next 2 pages show the dual inlet system and MVP Hydra inlet water paths The 4 Magnet Flow Meter is shown on the LEFT The 2 Magnet Flow Meter is shown on the RIGHT HYDRAULIC COMPONENTS Flow Meters The MVP and MVP Hydra incorporate high precision 4 magnet flow m...

Page 26: ...26 HYDRAULIC SCHEMATIC MVP ...

Page 27: ...27 HYDRAULIC SCHEMATIC MVP HYDRA ...

Page 28: ...p motor to power the pump CE machines use a 50 Hz Fluid O Tech pump motor MVP vs MVP Hydra Pump Configurations MVP machines have a single pump motor for the machine The pump has the dual inlet configuration as shown MVP Hydras have a pump motor for each group present and come with a manifold to separate the incoming water to the appropriate routes MVP Hydra 3 Group Pump Motors with Bypass Assembli...

Page 29: ...on pressure at which point the expansion valve releases the excess pressure Brew Tank Check Valve Check valves are one way valves which ensure that pressurized water cannot over whelm the incoming water pressure and exit the machine through the inlet lines Brew Inlet Hose Supplies the brew system with water from the pump Hydra models have a pump motor and hose for each group A 3 group MVP Hydra wi...

Page 30: ...in valve allows the user to increase or decrease the flow of cold water from the cold water valve above going to the hot water tap Turning this valve completely clockwise shuts the cold water off while turning it counterclockwise allows more cold water in Pressure Relief Valve PRV The PRV is a safety release for the steam boiler which opens and releases pres sure if the boiler rises above 3 5 bar ...

Page 31: ...k Water Level Probe Upper Low Water Alarm Probe Steam Tank Heating Element MVP or MVP Hydra Temperature Probe Steam Gauge Brew Tank 1st Position Brew Tank Fill Tube Steam Shut Off Valve Steam Tube MVP 3 Group Water Inlet Right Side MVP Brew Group Inlet Assembly Single Expansion Valve 2nd Position Brew Tank Fill Tube Pressure gauge tube MVP Hydra only ...

Page 32: ... heating or low water levels Low Level Probe Detects when the water in the steam tank is very close to the element The controller board immediately cuts power to the heating elements registers an STLW00 error on the display and be gins an audible alarm to alert the operator to the problem Steam Actuator Rod This rod is pushed in when the steam handle is activated The rod opens the internal seal re...

Page 33: ...orking on the machine The major components of the electrical system can be broken down into the following functional categories 1 Heating components temperature probes elements thermal resets and various parts of the CPU 2 Water control water inlet valves brew valves mix and hot water valves water level probes and various parts of the CPU rocker and brew preinfusion switches pump and motor 3 Opera...

Page 34: ...34 ELECTRICAL SYSTEM Main Electronics Board MVP MVP Hydra ...

Page 35: ...ydra Electrical Box ELECTRICAL SYSTEM Electrical Box Components Numbered 1 Brew Relays Switch high voltage onto the brew tank heating elements 2 Each Pump Motor Wire Carries 220v to the pump motors from the electrical box Contains 3 wires black L2 N white L1 and green ground A fourth wire Red is used for the bypass system control when appropriate 3 Grounding Post For all earth ground connections 4...

Page 36: ...ughout the machine 10 Ribbon Cable Connects the hand held display to the Main Electronics Board 11 Level Probe Wires and Connectors Connect level probes to power board and ground 12 Temperature Probe Connections Connect temp probes to display board 13 Steam Tank Element Relays Switch high voltage onto the steam tank heating elements 14 Heat Sink Fanned Aluminum Block Dissipates heat produced by th...

Page 37: ...tuator magnet reaches the far left position b Slowly allow the actuator to return to center The SW1 Out LED should turn back off before the actuator reaches its center resting position note that the actuator will never quite return to the exact center on its own though it should get fairly close c Slowly turn the actuator counter clockwise watching the SW2 Out LED The LED should light at some poin...

Page 38: ...38 ELECTRICAL SYSTEM Electrical Schematic ...

Page 39: ...e current temperatures for each brew group along with the steam tank The most recent error will also be shown in the lower right corner No settings can be changed on this screen In some circumstances numeric temperatures will not be shown If a tank is reading LOW this indicates that the tank is below the temperature probe s effective range of measurement 170 F 270 F 76 6 C 132 2 C Readings above t...

Page 40: ...seconds will skip the preinfusion phase in MP and VP modes One step lower than 0 0 is the MAN setting which will require the operator to exit the preinfusion phase manually in MP mode and will skip preinfusion in VP mode Line 4 indicates the length time set for the ramp up phase in the current program This option will ONLY be visible on MVP Hydra models Ramp up time begins once the preinfusion sta...

Page 41: ...1 shows the current reading of the steam tank temperature probe LOW in this example Once this temperature reaches the set point the digital display will continuously cycle up and down by small incre ments as the electronics balance the temperature Line 2 is indicating the set point of 250 0 F 121 1 C The adjustable set range for the steam tank is between 200 F and 265 F 93 3 C and 129 4 C Line 3 i...

Page 42: ...The auto backflush can be interrupted mid cycle by shifting to the left or right or by turning the setting on the controller back to off To cycle back to the temperature overview screen press the down button For firmware versions 2 4 2 57 the steam tank and hot water tap settings were displayed on separate screens For firmware versions 2 62 and above the steam tank and hot water tap settings are d...

Page 43: ...emp BROT01 BROT02 BROT03 Over Temperature 220 F UT Under Temp BRUT01 BRUT02 BRUT03 Group reads 180 F for 1 minute while reheating BP Bypass Valve BRBP01 BRBP02 BRBP03 Bypass Valve has been held on for 5 consecutive minutes ST Steam System Codes LOW H2O Low level probe not in contact with water audible alarm LW Low Water Probe STLW00 N A N A Indicates past LOW H2O warning FP Fill Probe STFP00 N A N...

Page 44: ...44 PROGRAMMING Brew System Error Codes ...

Page 45: ...45 PROGRAMMING Brew System Error Codes ...

Page 46: ...46 PROGRAMMING Brew System Error Codes ...

Page 47: ...or this issue The time it takes for the water lev el to drop below the low level probe and post the LOW H2O error depends upon the water and steam us age of the machine during operation The following flowchart will begin with the LOW H2O heading because that is the error likely to be seen on a machine that has ceased to heat the boilers However the flowchart will cover all three of these error cod...

Page 48: ...48 PROGRAMMING Steam System Error Codes ...

Page 49: ...49 PROGRAMMING Steam System Error Codes ...

Page 50: ...50 PROGRAMMING Steam System Error Codes ...

Page 51: ...ot be deactivated Shifting right while not brewing a shot will cycle through any program save locations currently active in numerical order 1 2 5 1 as shown This setting is applied to all groups To cycle to the next display screen press the down button PROGRAMMING Menu Level 2 Lockout Menu Level 2 Programs Home Button 4th Line Button Access to Menu Level 2 There are 3 levels of menus a technician ...

Page 52: ...tes When the brew groups are finished draining set the brew valve indicator back to the NORMAL setting If the draining process takes longer than 5 minutes the machine s safety programming will automati cally turn the brew valve indicator to the NORMAL setting while exiting back to the temperature overview screen If more time is needed return to the Temperature Display screen and set the brew valve...

Page 53: ...ing method is as follows Using a bottomless portafilter dose out 16 18 grams of coffee into a 14 gram basket with a thermal probe inserted 1 8th of an inch from the surface and in the middle of the puck packing and tamping the grounds in the basket as usual The thermal probe is then wired to a FLUKE thermometer to relay the actual temperature of the water flow ing through the puck while pouring a ...

Page 54: ...ric func tioning of the machine To cycle to the next display screen press the down button Line 2 indicates the measured steam temperature at the steam tank temperature probe Line 3 is the offset used to calibrate the steam tank temperature and pressure so that when the steam tank is set at 250 F there is 1 3 bar pressure on the gauge Line 4 of this display screen is showing a 5 second delay The fi...

Page 55: ...PROGRAMMING Menu Level 2 Heating Elements This screen is available from firmware versions 2 62 and above For firmware version 2 4 2 57 the element settings are accessed in menu level 1 as shown on page 42 During certain maintenance procedures or technical troubleshooting it may be necessary to disable sections of the machine s heating system For proper performance of the machine all elements shoul...

Page 56: ...heating the machine back up to the set points Enabling the power save mode will drop the temperature in the brew groups to 180 F 82 2 C and the steam tank to 220 F 104 4 C when it is active This will help conserve energy while preventing maintenance issues that occur when machines are turned off and on repeatedly While power save mode is active there is a note on the display which states that the ...

Page 57: ... low Line 3 indicates the date and time that the last error has occurred If no error has occurred this line will be blank Line 4 gives the option to scroll through or clear the error log To view older errors press the 4th line button once which will make SCROLL flash Use the up and down buttons to change the viewed error Press the 4th line button again and CLEAR will begin flashing instead of SCRO...

Page 58: ...og This is the last screen in the second level of menus Pressing the 3rd line button will take you back to the temperature overview screen in the 1st level of men us Accessing Menu Level 3 Access to the 3rd level of menus is only available from the Return to Operation Mode screen Menu level 3 contains machine configuration settings which do not change over the life of the machine Technicians will ...

Page 59: ...if the model value is not H The serial number entered on this screen is shown during the machine boot up sequence If any settings on this screen are changed the machine will require a restart upon exiting this screen When prompted press the corresponding line button to restart or to cancel and revert to the previous settings Machines with firmware version 2 62 and above will display the Configurat...

Page 60: ...e to the next screen press the down button Shot timer display brightness can be adjusted on this screen Use these settings to bring all shot timers to a uniform brightness Values range from 0 15 Current factory default setting is 3 Lower settings help to pre serve the lifetimes of the displays To cycle to the next screen press the down button Menu Level 3 Shot Timer Display Brightness ...

Page 61: ... of electrical infrastructures outside the USA that differ from the standard configured machine specs Line 2 indicates that the feature is disabled To enable the feature a machine specific PIN must be en tered on Line 4 Contact Synesso Technical Support in order to request a PIN and instructions Synesso approval is required in order to utilize this feature Menu Level 3 Factory Diagnostics The fact...

Page 62: ... note of all Synesso programmed settings before doing a full reset of the machine RESET CANNOT BE UNDONE PLEASE BE CAREFUL Menu Level 3 Full Reset The proportional integral derivative PID controller is a sequence of algorithms using a few finely tuned parameters to achieve and maintain a set temperature in each tank Synesso strongly recommends AGAINST altering these values The default values are s...

Page 63: ...rent version so as to make certain features available and receive the most improved machine functionalities please have a qualified technician reach out to Synesso Technical Support One of our technicians can provide the latest firmware and instructions needed to perform the update Note The main electronics boards for the MVP Series feature a USB Type B Connector see the picture on page 35 and ass...

Page 64: ...g Backflushing without the screen can cause detergent and other unwanted particles to enter the brew system and can lead to valve and flow prob lems Remove and clean the screen and screw after backflushing is complete Do not forget to reinstall General Machine Cleaning 1 Clean the surface of the machine using a soft damp cloth Avoid using abrasive cleaners or cleansing pads Take extra care on the ...

Page 65: ...he portafilters Note Rinse screens and screws thoroughly before installing and using Make sure you install the screens before brewing any shots of espresso Failure to do so may plug the drain lines with coffee grounds DO NOT overtighten the screw during reassembly Monthly 1 Check your water filtration system and make sure the cartridges and filters are changed as needed In ar eas of high mineral c...

Page 66: ...nds Check that expansion valve does not leak at 9 bar 11 12 bar is the factory standard setting Expansion valve 1 4070 Check line bypass and pump pressures Inspect steam tank vacuum breaker Replace if signs of leaking Vacuum breaker 1 4265 Inspect steam tank pressure relief valve dark spots may indicate leaking Replace if signs of leaking Pressure relief valve 1 4100 Depressurize steam and brew sy...

Page 67: ...of volumetrics across all groups Check that expansion valve does not leak at 9bar 11 12 bar is the factory standard setting o Expansion valve 1 4070 Check line bypass and pump pressures Replace steam tank vacuum breaker o Vacuum breaker 1 4265 Inspect steam tank pressure relief valve dark spots may indicate leaking Replace if signs of leaking o Pressure relief valve 1 4102 Depressurize steam and b...

Page 68: ...e wire Drain the steam tank until the fill valve activates 8 Reheat the steam tank 9 Remove the yellow tube guard and check the PRV for leaks Listen for hissing Replace the PRV if it will not seal 10 Replace yellow tube guard An older gauge is potentially less reliable than when first manufactured Additionally a steam tank gauge that has exceeded its scale limit of 60psi may be damaged internally ...

Page 69: ... make the starting brew pressures more consistent run each group briefly without the pump on This can be done using the BREW VALVES function on the TEMPERATURE DISPLAY screen found in the 2nd level menu see page 52 5 In the 2nd level menu cycle to the FLOWMETER CALIBRATION screen see page 54 6 Position the cup under the 1st brew group 7 Follow the on screen prompts to dispense a test volume of wat...

Page 70: ...e to reflect what you will actually receive on your puck We re fer to this adjustment between tank temperature and puck temperature as an Offset Offsets translate our precision to accuracy Imprecise machines will not be able to settle on an offset as each shot will provide a different puck temperature Imprecision makes accuracy impossible The exact procedure Synesso uses to determine the offset is...

Page 71: ...71 TEMPERATURE OFFSETS ...

Page 72: ...eplace Brew temperature is too cold Crema is Thin with Large Bubbles and Tastes Astringent Coffee is old Grinder burrs are dull Brew temperature may be set too low Diffuser Screen is Loose This is most likely caused by over filling the portafilter basket with coffee This causes the expanding coffee puck to push against the diffuser and bend the screen to screw contact point away from the screw No ...

Page 73: ...essure the expansion valve will need to be tightened Check pump to make sure pressure is properly set Water supply hose to the pump is kinked Water filter is plugged Check and replace if necessary Brew valves are worn and water is being diverted to the discharge drain Check that the brew valves are not discharging water while the group is on Look for error VMUF0 Brew Pressure is High above 12 bar ...

Page 74: ...degrees above your set point but your brew water is actually at the set point Brew Temperature Reads Low error BRUT0 Be sure to allow 20 40 minutes from the time the machine is powered up as the temperatures need to stabilize Ambient temperature and airflow can change how quickly the machine reaches stability Check that the element breaker is in the ON position Check that the relay is functioning ...

Page 75: ...ing element posts and ground metal of tank or frame If continui ty exists the element has failed Check for proper resistance across element posts If resistance is out of spec the element has failed WARNING Disconnect power to the machine when testing the elements Test the element relay If relay is not receiving a low voltage signal from the board but is outputting high voltage the relay has failed...

Page 76: ... is NOT Opening When the valve is signaled to open a red light should be lit on the solenoid switch If the valve should be receiving a signal to open and a red light is not present the low voltage signal or ground may be inter rupted Further electrical troubleshooting is required If a red light is present on the solenoid switch when the valve is signaled to open check for 220 VAC across the red an...

Page 77: ... pressure Check steam temperature set point to make sure it s high enough for your application Watch the steam gauge when the pressure drops allow the heating ele ments to heat the incoming cold water When it reads above 1 1 bar hot water and steam may be dis pensed again Check the wired controller to make sure all temperatures especially in the steam tank are close to their set points Check the e...

Page 78: ... water until the autofill system activates Once autofill stops recheck the water level Debris is stuck in the water control fill valve Level probes require inspection Clean or replace probes as needed Steam Has Undesirable Smell Water from Tank is Discolored and or Has Debris The tank is contaminated Drain the tank and refill If quality of water and steam does not improve soak ing the tank with a ...

Page 79: ...hot side of the mix valve is leaking Open and clean the hot water valve Replace valve if necessary Steam Wand See troubleshooting related to steam wand starting on page 76 Brew Groups A leaking diffuser indicates the brew valve is not sealing properly Open the valve and clean the sealing faces with a soft cloth Inspect the valve for scale and calcium buildup If water leaks out around the sides of ...

Page 80: ...ze 8 5 mm gaskets are being used and that the gasket is seated fully around the diffuser block If the portafilter stopping point is occurring after the normal point handle points to the right inspect the ears of the portafilter for wear If brass is showing on the ears try using the taller 9mm gaskets Alternately you can replace the portafilter head Pump Motor is Making an Unusual Sound Make sure t...

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