Bosch GWH 12 CTD E 23 F3 O Training And Service Information Download Page 66

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Page 66 from 76 6 720 814 719

SM FP_Australia 2017/04 EN

Bypass valve damaged or disconnected (only outdoor GWH 16 /20 /26)

Characterístic:

Solenoid valve (proportional valve normally closed and controlled with 0 – 24 V dc)

No rotational speed sensor signal from primary fan

Characteristic: Primary Fan (DC centrifugal fan)

Lock Out Error

appliance enters in lock out immediately

Check bad wire connection in the

connector in the back cover of

control unit

Problem solved?

Fan unplugged / cables

disconnected or not correctly

attached

Yes

Measure output signal from

control unit

End

Solenoid valve is

connected?

Ensure that cables are

connected

Problem solved?

Note: error only displayed if valve was

requested to activate due to temperature

variations above set point

Damaged Valve

yes

end

Replace Valve

Run the calibration “bP”

function in parameter PA

Problem solved?

yes

Summary of Contents for GWH 12 CTD E 23 F3 O

Page 1: ... FAN PRESSURIZED GAS WATER HEATER FOR INDOOR AND OUTDOOR INSTALLATION TRAINING AND SERVICE INFORMATION FOR AFTER SALES This document is restricted to exclusive use by the official service partners Each country should adapt the manual and its contents to the available range 12 16 20 12 16 20 26 ...

Page 2: ...NNECTION 7 3 4 APPLIANCE PERFORMANCE 7 4 COMPONENTS OVERVIEW 8 4 1 CONTROL PANEL 9 4 2 HEAT CELL WITH BURNER PIPES 12 4 3 GAS MANIFOLD 13 4 4 FAN 15 4 5 GAS VALVE 15 4 6 HEAT EXCHANGER 17 4 7 WATER INLET ASSY 18 4 8 WATER TEMPERATURE SENSORS 18 4 9 BOX TEMPERATURE SENSOR 18 4 10 WATER FLOW SENSOR 23 4 11 IGNITION ELECTRODE 24 4 12 IONIZATION ELECTRODE 25 5 WORKING PRINCIPLE ELECTRIC MEASUREMENTS 2...

Page 3: ...ise GWH 12 16 20 CT Thermostatic control variable power through electronic control GWH 12 16 20 CTD Display GWH 12 16 20 CTD E Electronic ignition source is electricity GWH 12 16 20 CTD E 23 31 Gas type 23 natural gas 31 liquefied petroleum gas GWH 12 16 20 CTD E 23 31 F3 O Flue less model with fan pressurized operation outdoor unit GWH 12 16 20 CTD E 23 31 F5 Room sealed fan pressurized operation...

Page 4: ...GWH20 3 CT E23 F6 B S2405 GWH20 3 CT E23 F6 S2405 GWH20 3 CT E31 F6 B S2405 GWH20 3 CT E31 F6 S2405 GWH26 3 CT E23 F6 B S2405 GWH26 3 CT E23 F6 S2405 GWH26 3 CT E31 F6 B S2405 GWH26 3 CT E31 F6 S2405 Outdoor Installation temperature setting locked L GWH26 3 CT E23 F6 L S2405 GWH26 3 CT E23 F6 LB S2405 GWH26 3 CT E31 F6 L S2405 GWH26 3 CT E31 F6 LB S2405 Table 2 Appliance identification of high out...

Page 5: ... against water freezing inside of its pipes until 20ºC lower environment temperature acceptable by gas valve so to be used in cases where ambient temperature can be lower than 5ºC For indoor models is a kit but in outdoor models is inbuilt Pict 4 Anti Freeze layout The kit includes 8 resistances of 16W each which activate under conditions from table 3 Activation Deactivation T in 2ºC T in 5ºC or a...

Page 6: ...itions Check lists for technicians installers 3 1 Appliance fixation on the wall Requisite Confirmation Appliance is levelled and in the vertical position Delivered accessories are used accordingly Appliance is supported exclusively by the wall fixation and not by hydraulic and or gas connections Table 4 Check List for Fixation Pict 5 Pre installation distances indoor outdoor Pict 6 Wall Fixation ...

Page 7: ... Maximum pressure 1000kPa Table 5 Check list hydraulic connections 3 3 Gas connection Requisite Confirmation The appliance is suitable for the available gas type Pressure reducer and gas pipe are adequate for the required pressure and gas flow Accessories for gas connection are adequate and according to the country specification standards Table 6 Check list for gas connections Pict 7 Manometer pip...

Page 8: ... thermometer 4 Components Overview 1 Collector 2 RSF box 3 Heat exchanger 4 Heat cell 5 Burner 6 Fan 7 Gas valve 8 Water valve 9 Ionization electrode 10 Ignition electrode 11 Gas inlet 12 Water inlet 13 Water outlet Pict 9 Internal view of Indoor models 12 16 20 1 3 2 4 6 10 9 8 7 5 11 12 13 ...

Page 9: ...t 10 Water inlet 11 Water outlet Pict 10 Internal view of high output outdoor models 16 20 26 4 1 Control panel The control panel allows the user installer or technician to perform all different operations needed Pict 11 Control Panel Overview indoor model Pict 12 Control Panel Overview in remote optional for indoor model default for outdoor model 9 10 11 ...

Page 10: ...erent services Enter in service mode Scroll in the service mode menu Save value or adjust set values Save a temperature set user Selection button Used to select temperature values adjustments and navigation on parameters inside the visualisation mode Table 7 Control Panel Buttons Symbol Description Observation Temperature Unit ºC default value ºF alternative value Selection can be done by changing...

Page 11: ...et 1K The symbol is deactivated and burner restarted when T out 60ºC if T set 50ºC T out T set 10ºC if T set 50ºC Fan operation Indication that the fan is in operation Table 8 Display Symbols There was an update in remote control software version in order to make it compatible for both products in the market so please refer to article code of the remote software version to be used according this r...

Page 12: ...r Pict 14 Heat cell detail with ignition ionization electrodes and burner blade detail Primary air plate The primary air plate is assembled between the heat cell and the gas manifold in order to ensure the correct mixture of air and gas according to the specific appliance model Platform Appliance Stamp Low output ind out 12l min 12 L 16l min 18 L 20l min 20 L High output out 16l min code 20l min c...

Page 13: ...burner over 2 different segments in order to assure a wide modulation range according to the capacity of the appliance The gas manifold for GWH 12 models have in total 9 injectors with following distribution NG Ø 1 7 LPG Ø 1 3 Pict 16 Gas manifold for 12l min Indoor Outdoor appliance with 9 injectors The gas manifold for GWH 16 models have in total 15 injectors with following distribution NG Ø 1 7...

Page 14: ...nt 1 Ø 2 0 in burner segment 2 LPG Ø 1 3 in burner segment 1 Ø 1 5 in burner segment 2 Pict 18 Gas manifold for 20l min appliance with 15 injectors The gas manifold for GWH 26 models have in total 17 injectors with following distribution NG Ø 2 0 in all burner LPG Ø 1 55 in all burner Pict 19 Gas manifold for 26l min appliance with 17 injectors Burner segment 1 Burner segment 2 Burner segment 1 Bu...

Page 15: ...of the fan is measured by the feedback signal provided by the fan s motor The signal consists on a square wave with a frequency proportional to the speed of the fan Pict 21 Different fan flanges 12 on left and 16 20 26 l min models on right 4 5 Gas Valve Over the control unit it is possible to control the gas flow to the burner by the modulating gas valve MV1 The gas valve is composed by other thr...

Page 16: ...modulated in order to ensure the correct hot water set temperature under water flow or temperature variations The burner is composed by 2 segments which are fed according to the gas flow for the injectors manifold released by the solenoid valves activation SV1 and or SV2 in gas valve which can be switched over according to the different thermal load in order to obtain a stable combustion These val...

Page 17: ...size and number of fins according to the appliance model 12 16 and 20l min and also different copper pipe connections if in high output range 16 20 26 l min This configuration ensures the sealed heat transfer from the flame heat to the water that flows through the copper pipes Pict 25 Heat exchanger SV2 SV1 SV3 MV1 Burner segment 1 Burner segment 2 ...

Page 18: ... a 10kΩ NTC See table 15 Both NTC are equal but connected to different cable colors blue wires to inlet water red wires to outlet water In the high output range the NTC s are immerged and as well equal but connected to different cable colors blue wires to inlet red to heat exchanger orange to outlet Contact Type 4000S Immerged Type Optiflow Pict 27 NTC Temperature sensor 4 9 Box Temperature sensor...

Page 19: ...Page 19 from 76 6 720 814 719 SM FP_Australia 2017 04 EN Pict 28 Box air temperature sensor location in 4000S models Pict 29 Box air temperature sensor location in optiflow model ...

Page 20: ... PCB design The PCB are always compatible with existing cables interface in the field nevertheless and for 4000 S models was done a change in the connector type so to ensure compatibility between new control unit with cables in the field adaptors are be supplied from FD 718 Feb 2017 Adaptor name Adaptor design Connection Picture 8 Pins connector Fan 12 Pins connector Water Valve 14 Pins connector ...

Page 21: ...ct 31 Overview of the PCB with adaptors for 4000S Picture 32 Overview of control unit and cables for FP Australia Description 1 Control unit indoor version 2 Control unit outdoor version 3 Power supply cable 4 Sensor cable 5 Gas valve cable 6 Water valve cable ...

Page 22: ... 33 Rear view of control unit from FP Australia and adapters use On the picture 34 is presented the example of an adapter connecting the old cable of the fan with new pcb Picture 34 PCB with adapter on the Fan terminal Power supply Fan Water valve Sensors Gas valve ...

Page 23: ... DC signal proportional to the measured water flow Flow rate to operate the appliance 2 l min Flow rate to shut off the appliance 1 6 l min Pict 36 Motorized water valve water flow sensor stepper motor In case Q 2 l min following Pout verification occurs If Pout Minimum Power the appliance will run with the calculated minimum water flow in order to reach the set point with a temperature stability ...

Page 24: ...de Spark generation is started immediately before opening the gas valve and stopped when ionization is sensed Pict 38 Ignition electrode In order to prevent harder ignition processes and be sure of conditions of gas supply and burner stability following situation is verified during the so called safety time period In each of the attempts the system monitors the ionisation signal this signal drives...

Page 25: ...d for ionization currents higher than 0 8 µA Pict 39 Ionization electrode 1st Ignition Sequence Safety Time 29 sec 1st Attempt 5 sec Purge Period 3 sec 2nd Attempt 5 sec Purge Period 3 sec 3rd Attempt 5 sec Pos Purge 8 sec 2nd Ignition Sequence Safety Time of 29 sec 1st Attempt 5 sec Purge Period 3 sec 2nd Attempt 5 sec Purge Period 3 sec 3rd Attempt 5 sec Pos Purge 3 min ...

Page 26: ... Pict 41 Burner detail with electrodes and top view 5 Working Principle Electric Measurements Water Flow Detection and solar mode operation Water Flow Calculation procedure WF Power T set T in WF 2 0 l min Burner ON WF 1 6 l min Burner OFF Burner On Solar mode Operation Burner Off T in T set 1ºC T out T set T out T set ...

Page 27: ... fuse with continuity Input Contact closed Ionization reading Input 0 µA Temperature sensors OK Input Ohm Value inside range Hot Water Demand tap opening Turbine detects water flow Input Frequency value to control unit Spark to ignition electrodes Output Gas valve solenoid activation Output V DC Flame on main burner Ionization detection spark stops Input I 0 8 µA Hot Water Delivery Safety devices ...

Page 28: ...nection 6 Remote control connection 7 Solenoid Valve MV1 Modulation 8 Solenoid Valve SV1 Safety 9 Solenoid Valve SV3 Burner 10 Solenoid Valve SV2 Burner 11 Thermal fuse 12 Water flow sensor 13 Air Box temperature NTC 14 Outlet water temperature NTC 15 Inlet water temperature NTC 16 Motorized water valve Pict 42 Electric Diagram for GWH 12 16 20 ...

Page 29: ...ontrol optional 7 By pass valve 8 Modulation electrovalve gas 9 Segmentation electrovalve 1 gas 10 Segmentation electrovalve 2 gas 11 Safety electrovalve gas 12 Thermal fuse 13 Water flow sensor 14 Air temperature sensor 15 Hot water temperature sensor 16 Cold water temperature sensor 17 Water valve 18 Outlet water temperature sensor Pict 43 Electric Diagram for Outdoor GWH 16 20 26 ...

Page 30: ...ency signal 11 Thermal Fuse actuation temperature 114ºC Multimeter for resistance measurement R Ω White cable White cable Circuit open Not Ok infinity no continuity Circuit closed Ok 0 Ohm continuity 13 Air Box temperature NTC See corresponded values in table 15 14 Outlet water temperature NTC See corresponded values in table 16 for 4000S or 17 for Optiflow 15 Inlet water temperature NTC Table 14 ...

Page 31: ...Ω R max KΩ 0 30 34 30 40 36 47 5 23 67 25 90 28 12 10 18 62 20 24 21 87 15 14 75 15 95 17 15 20 11 77 12 65 13 54 25 9 45 10 11 10 77 30 7 64 8 13 8 63 35 6 22 6 58 6 96 40 5 09 5 36 5 64 45 4 18 4 39 4 60 50 3 46 3 62 3 78 55 2 88 3 00 3 12 60 2 41 2 50 2 59 65 2 00 2 09 2 17 70 1 68 1 75 1 83 75 1 41 1 48 1 55 80 1 19 1 26 1 32 85 1 01 1 07 1 13 90 0 86 0 91 0 97 95 0 74 0 78 0 83 100 0 63 0 68 ...

Page 32: ... 105 0 67 0 70 0 73 110 0 59 0 62 0 65 Table 17 NTC resistance values for immerged water temperature NTC s Optiflow ID Component Description Measuring Wire Colours Value Remarks 1 Ionization Electrode White wire to ionization electrode Multimeter in position for current measurement with scale for µA range of values Ionization current 0 8 µA Note Cables connected in serial between ionization cable ...

Page 33: ...art up of the appliance and a correct function after any intervention on the appliance the installation manual must be read and instructions and main functions must be explained to the end user Table 16 indicates the method and values for testing the main components function and consequently ensure a correct and safe operation of the appliance 6 Service When replacing the control unit configuratio...

Page 34: ...Page 34 from 76 6 720 814 719 SM FP_Australia 2017 04 EN Pict 45 Confirmation of HMI configuration gas type Australia settings highlighted Not Applicable for AU models ...

Page 35: ...egister P1 and P2 values from the existent unit configuration Procedure to enter in Service Mode Press and hold Program and buttons for more than 3 seconds As soon as 188 is displayed release buttons till the display indicates P2 From this position and using the selection buttons and different service modes can be assessed Pict 47 Service mode entry procedure ...

Page 36: ...te Control Registration P4 Diagnostic mode P5 Ignition Startup delay P6 Temperature Unit Selection P7 Gas Type Selection Set point Normal Mode P0 Gas valve adjustment P8 Back light activation See Combustion gas power adjustments section for more details PH Burner Stop Conditions P9 Fan Purge PA Calibration of components See table with parameters ...

Page 37: ... P4 Diagnostic mode E Exit 0D Set point 1D Inlet Temperature 2D Outlet Temperature 3D Water Flow 5D Box air temperature 1F 10F Last recent failures AL Show All Segments rP Reset to factory default values AP Appliance Power Setpoint Normal Mode SL Set Point Limit AS Altitude Adjustment SC Set Point Calibration Pu Purge selection ...

Page 38: ...see correspondent manual Gas valve replacement Start up of unit when need to operate with Propane LPG models are adjusted on factory for Butane Following image indicates the 2 measurement points to be used Pict 48 P0 P1 P2 adjustment measurement points Pict 49 Gas Manometer Connection Gas Pressure Measurement Point Measurable values P burner P0 P1 L1 P2 L2 Fan Pressure Measurement Point Measurable...

Page 39: ...P L1 P A1 To keep the appliance in P1 maximum power adjustment is important to assure a minimum water flow otherwise the appliance will jump automatically to P2 minimum power GWH 12 Flow 4 l min GWH 16 20 Flow 6 l min GWH 26 Flow 8 l min Table 22 Minimum water flow needed to keep P1 Maximum Power adjustment Technician Level Comments Maximum power burner adjustment after repairs maintenance gas con...

Page 40: ...o change parameter press Program button when inside of P1 Appliance Natural Gas Propane P1 ΔP kPa GWH 12 0 46 0 50 0 63 0 67 GWH 16 0 37 0 41 0 63 0 67 GWH 20 0 33 0 37 0 44 0 49 P2 ΔP kPa GWH 12 0 05 0 08 0 05 0 08 GWH 16 0 05 0 07 0 05 0 07 GWH 20 0 04 0 08 0 05 0 08 Table 24 Values measured on gas manometer for low output models Appliance Natural Gas Propane P1 ΔP kPa GWH 16 0 22 0 28 0 25 0 32...

Page 41: ...tenance gas conversions P2 contains the fan speed setting A2 and gas power L2 at minimum power depends on gas type model depends on gas type model When P2 is visible press P and enter in the 2nd level accessing E for enter and or exit P1 Minimum Input Power Not Used by default will display 20 Adjustment of air flow without change gas conditions Range from 0 to 40 Spare part default setting is 20 A...

Page 42: ... in the bottom of the unit for configuration of the smartphone with the unit After turn ON Bluetooth select the device named ID in the list of available Bluetooth devices with format BTWH xxx yyyy Use S N as password for the connection 6 digits Note The Password 6 digits in label needs to be inserted in APP of smartphone when pairing is activated selecting the ID corresponding to the unit The labe...

Page 43: ...ocation and area where App is being accessible Bluetooth range allows up to 10 m around unit Note If the Outdoor unit is installed inside an outdoor cabinet the presence of metal covers glass can reduce reachability of Bluetooth signal Test App performance in front of the unit Open front cover and identify if Bluetooth dongle is connected Note In case visible led is blinking the communication is o...

Page 44: ... connection 4th Press restore to upload configuration data in new ECU Diagnostic Mode The access to the data visualization mode is made by entering first in the service mode and then scrolling to the parameter P4 of the adjustment mode Diagnostic mode and visualization mode Installer Level Technician Level Comments This mode helps the installer in the startup to check parameters such as water flow...

Page 45: ...Inlet water temperature Temperature read by inlet sensor ºC or ºF Temperature indication Hot water temperature Temperature read by outlet sensor ºC or ºF Water flow indication l min 0 5l min Indicates water flow measured by the turbine l min Not existing Temperature of air in room sealed box Temperature read by outlet sensor ºC or ºF until Last 10 Failures for diagnostic purposes Failure 1 is last...

Page 46: ... to be selected by user 55ºC 60ºC 70ºC SC Set Point Calibration Internal Compensation of set point defined by user in order to compensate temperature loss until last consumption point Value can be adjusted ºC by ºC 4000S set point 5ºC to set point 5ºC Optiflow set point 2 5ºC to set point 2 5ºC AS Altitude Adjustment combustion optimization default value depends of TTNR and destination Country Aus...

Page 47: ... value defined here is defined in seconds and will create a delay in the startup sequence since flow rate is detected in order to allow pre heated water to reach appliance without unnecessary burner activation when water is hot Table 30 P5 Temperature Unit selection To change the temperature unit enter first into the service mode and then scroll to the parameter P6 By pressing the P button while t...

Page 48: ...tings 20 Natural Gas G20 31 Propane G31 Not used settings 30 Butane G30 25 Natural Gas G25 28 natural Gas G20 with injectors of 1 8 NG models will have from factory 20 LPG models will have from factory 31 Note spare part pre set value is 20 Table 32 P7 Backlight activation Default Value Possible Selection Comments dE deactivated ON Allows the activation of the backlight of the LCD Not Available fo...

Page 49: ...check sign visible in display Motorized water valve stepper motor calibration Open hot water and motorized valve will close completely the flow and start opening until minimum flow rate detection Adjustment of water flow sensor Open hot water to start appliance and press P checking the water flow l s x 10 Appliance will shut off while calibration is being done until inlet and outlet NTC measure sa...

Page 50: ...inued efficient operation of the appliance it is recommended that it is checked and serviced as necessary at regular intervals The frequency of servicing will depend on the particular installation conditions and use profile but in general once a year should be adequate Any intervention service work in the appliance must be carried out by a competent person such as registered and competent technici...

Page 51: ... front to the outside of the water assy Clean the filter with water and or air pressure and assemble it back on the water Pict 51 Water filter removal low high output range Inspect and clean the heat exchanger when needed To remove the heat exchanger isolate the appliance from incoming cold water supply at the inlet cock Open the taps to release any remaining water pressure and drain the appliance...

Page 52: ...olutions must be used with extreme caution Take care not to splash on to the skin or into the eyes Wash any affected areas with large amounts of cold water and seek medical advice Pict 53 heat exchanger descaling Re assemble the heat exchanger ensuring its correct position on the two support hooks in the appliance back plate good conditions of sealings and tightness between heat exchanger collecto...

Page 53: ... supplied sealing s in burner collector replacement Pict 55 using supplied sealing s in heat exchanger replacement When opening heat cell for cleaning washing refers to gasket kit if components are not being replaced as example below for 12 16 20 models 1 kit per capacity ...

Page 54: ...box T box 70ºC Warning reset by closing water A4 Air Box NTC temperature sensor defected open or short circuit Lockout self reset when conditions corrected A7 Outlet water NTC temperature sensor defected open or short circuit Warning self reset when conditions corrected A8 Failure in heat exchanger outlet NTC Warning self reset when conditions corrected Note error only existing in outdoor GWH16 20...

Page 55: ... E1 Over temperature detected in hot water outlet sensor T out 85ºC Warning Lockout Self Reset when T 60ºC E2 Inlet water NTC temperature sensor defected open or short circuit Warning self reset when conditions corrected E4 Air Box NTC temperature sensor protection by over temperature detection T air 80ºC Lockout manual reset E9 Thermo fuse opened circuit overheat T 114ºC Lockout manual reset EA N...

Page 56: ...ion not ok Clearances for air admission flue discharge according IM Sealing between flue pipes and appliance Measure CO2 value at flue measurement point in maximum power with without front cover Without Front Cover CO2 G20 5 5 0 2 CO2 G31 6 6 0 2 Temp gases máx 170ºC Temp gases min 45ºC With Front Cover Máx CO2 CO2 without front cover 0 3 Yes Yes No No Adjust appliance by confirming ΔP1 ΔP2 accord...

Page 57: ...r flow due dirty outlet in tap Yes Low water flow due to blocked appliance inlet filter Water flow below minimum specified value Min water flow 2 2 l min No Clean eventual debris dirtiness in tap Remove purge cap and disconnect inlet connection to inspect and clean inlet filter Yes Water flow above minimum specified value and confirmed with water flow meter No Check turbine connections in control ...

Page 58: ...nterrupted or in short circuit Ensure NTC wire is attached in NTC sensor Unplug Wires and measure the NTC electrical resistance R Ω R 30 kΩ or 0 5 kΩ R Ω NTC values out of range NTC interrupted Replace NTC Plug NTC connection wire and turn ON unit Problem solved End Change wiring Problem solved Replace control unit See spare part list See spare part list Refer to table with values in Service Manua...

Page 59: ...the NTC electrical resistance R Ω R Ω Current T air ºC Correct position and fix NTC in original position Replace wiring Check origin of high temperature inside box Evidences of leakages through sealing s or HE overheat End Correct problem by inspecting and or replacing gaskets sealings in Heat Cell See spare part list Yes No No Yes No Yes Refer to table with values in Service Manual Power Reductio...

Page 60: ...cuit Assure NTC cable harness is connected in control unit Unplug the NTC connection and measure the NTC electrical resistance R Ω R 1300 kΩ or 8 2 kΩ R Ω NTC values out of range NTC interrupted Change wiring Plug connection wire and turn ON unit Problem solved End Change wiring Problem solved Replace control unit See spare part list See spare part list Refer to table with values in Service Manual...

Page 61: ...upted or in short circuit R 30 kΩ or 0 5 kΩ R Ω NTC values out of range NTC interrupted Replace NTC Plug NTC connection wire and turn ON unit Problem solved End Change wiring Problem solved Replace control unit See spare part list See spare part list Refer to table with values in Service Manual Yes No No Yes No No Yes Yes ATTENTION Red wires outlet NTC Ensure NTC wire is attached in NTC sensor Unp...

Page 62: ...itch on wáter heater Problem solved end Change cable See spare part list Table2 see resistance values Tª de operación ºC R nominal KΩ 0 30 40 5 25 902 10 20 247 15 15 950 20 12 657 25 10 115 30 8 138 35 6 589 40 5 367 45 4 398 50 3 624 55 3 002 60 2 500 65 2 092 70 1 759 75 1 486 80 1 260 85 1 074 90 0 918 95 0 788 100 0 680 105 0 588 110 0 510 Si No No Si No Yes ATENCIÓN Red Cables NTC in heat ex...

Page 63: ... both inlet outlet sensors Measure the NTC electrical resistance R Ω in both sensors R Ω Current Temp ºC Replace Sensor Refer to table with values in Service Manual Yes No Check assembly location on hot water pipe NTC with red wires cold water pipe NTC with blue wires and assure sensor tip is in contact with pipes straight surface not in elbows Test appliance and water stability Problem solved End...

Page 64: ...as stated in manual Refer to Installation Manual Concentric L max L pipes L equiv elbows Parallel L max L pipes intake L equiv elbows L pipes exhaust Yes No Obstruction in flue path Yes No Possible mis adjustment of P1 P2 With flue gas analyzer check CO2 correcting A1 A2 Sealing in flue collector extension pipes joining are obstructing the air admission See spare part list In case of need reset P1...

Page 65: ...No Possible mis adjustment of P1 P2 With flue gas analyzer check CO2 values correcting A1 A2 Sealing in flue collector extension pipes joining are obstructing the air admission See spare part list In case of need reset P1 P2 values and re adjust appliance with help of flue gas analyzer and ΔP values Without Front Cover CO2 G20 25 5 5 0 2 CO2 G30 6 8 0 2 CO2 G31 6 6 0 2 Temp gases máx 170ºC Temp ga...

Page 66: ...ppliance enters in lock out immediately Check bad wire connection in the connector in the back cover of control unit Problem solved Fan unplugged cables disconnected or not correctly attached Yes No Measure output signal from control unit End Solenoid valve is connected Ensure that cables are connected Problem solved Note error only displayed if valve was requested to activate due to temperature v...

Page 67: ...llow Blue pulse frequency Defective Fan No signal from control unit to fan Defective Control Unit Replace Control Unit Replace Fan No Yes Excessive water flow through water heater Water pressure excessive Water flow signal 172 5 Hz Yes No Refer to table in service manual with color code flow per model and correct it End Remove inlet water connection and check existence of water flow restrictor fil...

Page 68: ...set when T out 60ºC Defective control unit No Wrong connections in cables Replace control unit Turn Off and On Unit Permanent error code Clean filter and check if water flow restrictor is according specification Flow of water is very low Check water flow with a water flow meter Yes Correct Connections Yes Error code after interface manipulation Yes Problem persist Yes Unplug the NTC connection wir...

Page 69: ...e existence of thermostatic mixing valve before unit Appliance installed as a solar backup unit No The inlet NTC sensor is interrupted or in short circuit R 30 kΩ or 0 5 kΩ R Ω NTC values out of range NTC interrupted Replace NTC Plug NTC connection wire and turn ON unit See spare part list Refer to table with values in Service Manual Yes No No Yes Yes Maximum power very high ATTENTION Blue wires i...

Page 70: ...blem solved Replace control unit See spare part list No No Yes Yes Temperature inside box reach high limit Tbox 80ºC Check position of sensor attached at back cover of control unit NTC out of place and touching hot surface Measure the NTC electrical resistance R Ω R Ω Current T air ºC Correct position and fix NTC in original position Replace wiring Check origin of high temperature inside box See s...

Page 71: ...o over temperature Thermal fuse damaged melts at 114ºC Measure continuity R Check origin for high temperature occurrence Replace sensor see spare part list Yes Inspect main heat exchanger fins obstructed Yes Remove part and clean external fins Evidences of leakages through sealing s or HE overheat End Correct problem by inspecting and or replacing gaskets sealings in Heat Cell No Yes Heat Cell inc...

Page 72: ...ock to the appliance Yes No Contact gas supplier or check gas meter and safety shut off valve No gas at apartment Yes Yes Yes No Problem solved Measure static inlet gas pressure Gas valve not releasing gas to burner Safety Gas valve connections disconnected Assure Connection and measure resistance SV1 Blue Wires 100Ω SV2 White Wires 100Ω SV3 Black Wires 100Ω No Yes Solenoid signal to open is not o...

Page 73: ...ly line is not adequate in terms of size diameter to the installed power system Check gas pressure measuring with a gas manometer digital or manual in the gas inlet measuring point at the gas valve Incorrect wire connections to ignition ionization group Verify the wire connections of the ignition because Intermittent failure and bad contact in terminals can cause lack of ionization during operatio...

Page 74: ...e defined kit Yes No Appliance in Overload P1 P2 too high Correct adjustments of ΔP for P1 P2 adjusting L1 L2 A1 A2 proportionally Appliance power defined in P4 AP is not according capacity Enter service mode and check correct adjustment Yes Note all control unit as spare parts are supplied as NG G20 in P7 and 12 in AP No Appliance gas type defined in P7 is not according model Enter service mode a...

Page 75: ...g properly Characteristic Gas Valve Ionization system Loose or bad connection between cable and electrode Assure black wire is securely connected to the set of electrode Ionization cable damaged defective isolation Replace wiring and assure connection in electrode Yes No Ionization electrode damaged Replace electrode Yes Verify wires connection SV1 blue wires SV2 white wires SV3 black wires Measur...

Page 76: ...ational Training and Technical Support Aveiro Plant Portugal At end of a demand ionization is detected at burner Replace gas valve No Gas leakage caused by internal defect Problem solved Gas leakage caused by wrong signal Measure feed signal to SV valves 20 24 V dc Signal is continuous even without demand Yes Replace control unit Yes ...

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