Bosch Condens 2000 W Service Manual
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Bosch Condens 2000 W Service Manual

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Condens 2000 W
Service Manual
ZWB24 - 1AR...

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Summary of Contents for Bosch Condens 2000 W

  • Page 1 Condens 2000 W Service Manual ZWB24 - 1AR...

  • Page 2: Table Of Contents

    2 | Content Content Safety precautions and symbols Safety precautions Symbols Service Function Adjustment Service Function Overview Service Function 2.2.1 1. Service Level 2.2.2 2. Service Level Failures / Errors Elimination of errrors Failure / Error Codes Overview Failure codes and corrections steps Sensor (NTC) Values 3.4.1 Flow Temperature Sensor 3.4.2 Domestic Hot Water Temperature Sensor...

  • Page 3: Safety Precautions And Symbols

    Safety precautions and symbols | 3 Safety precautions and symbols Safety precautions Symbols Safety instructions in this document are identi- If you smell gas fied by a warning-triangle symbol and are print- B Turn off gas service cook. ed on a grey background. B Open windows.

  • Page 4: Service Function Adjustment

    4 | Service Function Adjustment Service Function Adjustment Service Function Service functions are in divided in 2 level : • 1. Level (see page 4) • 2. Level (see page 5) 6 720 644 501-07.1O Fig. 1 Stand by (On/off) Button „Up (+)“...

  • Page 5: Service Level

    Service Function Adjustment | 5 2.2.2 2. Service Level B Press button again (for entering).. After that you will see the selected (default) value on Dis- Operating play. Change or query of a service function : Changing / Adjustment of Value: B To enter to 2.

  • Page 6: Failures / Errors

    6 | Failures / Errors Failures / Errors Elimination of errrors All regulation, control and safety equipment of appliance is controlled by the control unit. Danger: Explosion ! B If any failure during operation occurs, symbol and B Turn off gas cock before working on gas- maybe will start to flash also.

  • Page 7: Failure / Error Codes Overview

    Failures / Errors | 7 Failure / Error Codes Overview Failure Code on Display Failure Descripton Steps MAP not selected (Fan speed adjustment accord- Check the adjustment /selection via service function ing the flue pipe length). 2.b.d). Combustion chamber NTC failure (behind burner) : Check the and the heat exchanger surface, whether is when the temperature by CC NTC reached to limit blocked or not.

  • Page 8: Failure Codes And Corrections Steps

    8 | Failures / Errors Failure codes and corrections steps and operating LED is flashing Combustion chamber NTC failure (behind burner) : when the temperature by CC NTC reached to limit Control Step Action B Check the cable connection. Check if combustion chamber NTC dam- yes: aged or not and the position.
  • Page 9 Failures / Errors | 9 and operating LED is flashing Combustion chamber NTC failure (behind burner) : when the temperature by CC NTC reached to limit Control Step Action Check the burner gas pressure. Are the yes: B Correct the gas pressure values. If not possible, values OK ? change the gas valve.
  • Page 10 10 | Failures / Errors and operating LED is flashing Combustion chamber NTC failure (behind burner) : when NTC not detected or open circuit Control Step Action Check if combustion chamber NTC dam- yes: B Check the cable connection. aged or not and the position. A6 failure still exist ? -->2.
  • Page 11 Failures / Errors | 11 and operating LED is flashing DHW (Domestic Hot Water) NTC not installed correctly or defect. The appliance doesn’ t run in summer mode. It works in winter mode and shows the failure code with alternately. Control Step Action Check the DHW NTC whether it is correct...
  • Page 12 12 | Failures / Errors B3 / d5 and operating LED is flashing Short circuit / failure in water level switch in recuperator (condens heat exchanger). Control Step Action Check the siphon line. yes: B Remove the blockage. B Switch on the appliance. Is there any blockage ? B3 / d5 failure still exist? -->2 -->2.
  • Page 13 Failures / Errors | 13 CE / d4 and operating LED is flashing A fast temperature increase detected in central heating (CH) (> 2,7 K/sec). The appliances will be resetet automaticly, if the flow temp. < 40 ºC. Control Step Action B Check system pressure on manome- yes:...
  • Page 14 14 | Failures / Errors and operating LED is flashing. Fan sensor not detected. ( This failure only occurs if there is a sensor or the cable physical defect) Control Step Action B Switch off the appliance. Is th fan cables damaged ? yes: B Change the cables.
  • Page 15 Failures / Errors | 15 and operating LED is flashing Target fan speed can not reached or blockage problem. Control Step Action Is the flue gas pipe blocked ? -->2. B Switch off the appliance. yes: B Clean the flue gas pipe. B Switch on the appliance.
  • Page 16 16 | Failures / Errors and operating LED is flashing. Appliance doesn’t modulate / Regulator valve problem (don’t regulate to max. position). Control Step Action Check if the regulator valve cable dam- yes: B Change the cable harness or correct it. aged or not and the connection.
  • Page 17 Failures / Errors | 17 and operating LED is flashing. Overheat lock-out by temperatur limiters (2 x STB : Flue gas + prim. Heatexchanger). In this case ; Heat demands is blocked and pump stops 3 minutes later. Control Step Action Is the system pressure between 1 - 2 yes:...
  • Page 18 18 | Failures / Errors and operating LED is flashing. Overheat lock-out by temperatur limiters (2 x STB : Flue gas + prim. Heatexchanger). In this case ; Heat demands is blocked and pump stops 3 minutes later. Control Step Action B Switch off the appliance.
  • Page 19 Failures / Errors | 19 and operating LED is flashing Ignition lock-out (flame not detected) (pump is running) Control Step Action Dose the burner flame can be seen? yes: -->6. -->2. Gas inlet cock open? yes: -->3. B Open the gas inlet cock. B Press RESET button and restart again.
  • Page 20 20 | Failures / Errors and operating LED is flashing Ignition lock-out (flame not detected) (pump is running) Control Step Action B Connect the cables. Is the gas valve working ? yes: B Switch off the appliance. B Switch on the appliance. B Pull out the gas valve cables.
  • Page 21 21 | Failures / Errors and operating LED is flashing Ignition lock-out (flame not detected) (pump is running) Control Step Action B Switch off the appliance. Check ignition electrode for damage and yes: oxidation ? B Change the ignition cable. B Switch on the appliance.
  • Page 22 22 | Failures / Errors and operating LED is flashing. Central heating flow temperature sensor failure (pump is running). Control Step Action Check if CH flow temperature sensor yes: B Check the connection terminal on NTC. (NTC) is damaged or not ? E2 failure still exist ? -->2.
  • Page 23 Failures / Errors | 23 and operating LED is flashing. After switching off gas flame detected (even the safety valves are closed (leakege)) Control Step Action Gas valve is defect. B Switch off the appliance. B Change the gas valve. B Switch on the appliance.
  • Page 24 24 | Failures / Errors is flashing. MAP not selected (Fan speed adjustment according the flue pipe length) Attention : The appliance is delivered with MAP value “0” (service function : 2.b.d). In this condition the appliance doesn’t run. The “I I” symbol will be shown on display alternately. Control Step Action B Adjust the MAP value via service fonction 2.b.d.

  • Page 25: Sensor (Ntc) Values

    Failures / Errors | 25 Sensor (NTC) Values 3.4.3 Flue Gas Safety Temperature Sensor ( Behind Burner) 3.4.1 Flow Temperature Sensor Temperature (°C) Temperature (°C) Measure Tolerance ±%10 Resistance (Ω) Measure Tolerance ±%10 Resistance (Ω) 27 936 14 772 12 136 11 981 5 774 9 786...

  • Page 26: Electrical Datas

    26 | Failures / Errors Electrical Datas Description Supply Voltage Value Tolerance Remarks Termperature Limiter 24 VDC 0 Ohm Temp. Limit = 110 ºC Pramiary HE Termperature Limiter 24 VDC 0 Ohm Temp. Limit = 100 ºC (Recuperator-Flue gas) DHW Temp. Sensor (NTC) 5 VDC 20 ºC =>...

  • Page 27: Electrical Circuit Diagram

    Failures / Errors | 27 Electrical Circuit Diagram 6 720 644 501 04 1O Fig. 2 Legends : Controller (room thermostat) connection Diagnostic connection Igniton transformer Flue gas temperature limiter (STB) (Recuperator) Supply cable Water level switch DHW temperature sensor (NTC) Ionisation electrode Gas valve Pump...

  • Page 28: Structure

    28 | Failures / Errors Structure res et 6 720 644 501-03.1O...
  • Page 29 Failures / Errors | 29 Fig. 3 Key to Figures : Expansion vessel Flue gas temperature limiter (STB) Condesing-Heat Exchanger (Recuperator) Air vent valve (manuel) Water level switch (Condensate backup sensor) Combustion chamber Distribution pipe (Inj. nozzle) Ionisation electrode Safety valve (heating circuit) Autom.

  • Page 30: Function Diagram

    30 | Failures / Errors Function Diagram Fig. 4 Control Unit (Cotronic 3) CH safety valve Water filling valve Siphon By-pass pipe Turbine DHW temperatur sensor DHW water flow rate limiter + Filter Flow temperature sensor Manometer Temperatur limiter Gas valve Combustion chamber (flue gas safety) sensor Siphon (trichtersiphon) (ops.) Ionisation electrode...

  • Page 31: Gas Values (Ch And Dhw)

    Gas Values (CH and DHW) | 31 Gas Values (CH and DHW) Burner Pressure Gas Flow Rate (mbar) (l/min.) (kg/h) Gas Type Wobbe index 15°C, 1013 mbar (kWh/m³) 14,1 24,3 Net calorific value 15°C, H (kWh/m³) 10,5 34,9 Display Output (kW ) 13,0 16,9 10,7...

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