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boiler service, boiler repair, emergency repair
Vaillant TurboMAX Plus 837 E Boiler Fault Codes
| Display | Indication | Displayed values/adjustment values |
| F00 |
Flow-NTC: NTC broken; NTC cable broken; Defective connection at NTC Defective connection at electronics |
Flow-NTC cable defective/ broken NTC faulty |
| F01 |
Return NTC: NTC broken; NTC cable broken; Defective connection at NTC Defective connection at electronics |
Return-NTC cable defective/broken NTC faulty |
| F10 | Short circuit - flow-NTC (<130°C) | NTC-plug shorted to casing, NTC defective |
| F11 | Short circuit - return-NTC (<130°C) | NTC-plug shorted to casing, NTC defective |
| F20 | Over heat cut off activated | Maximum temperature exceeded |
| F22 | Dry fire protection | No water in appliance, pump cable defective, pump blocked or defective, pump output too low |
| F23 | Dry fire protection (difference between flow and return NTC's too large) | No water in appliance, pump cable defective, pump blocked or defective, pump output too low |
| F24 | Dry fire protection (temperature gradient of flow NTC too steep) | Air in boiler/system, pump blocked or defective, pump output too low |
| F27 | No demand to gas valve | Electronic board defective; Gas valve defective |
| F28 | Boiler goes to lock out | No gas; Insufficient gas; Incorrect gas valve adjustment; Electrode defective; Ignition lead defect; Electronic igniter defective |
| F29 | Flame extinguished re-ignition unsuccessful | Gas supply absent or insufficient |
|
F32 (837/637 only) |
Main heat exchanger anti freeze protection mode due to fan speed deviation too great | Check fan control cables/connections; Defective fan control cable; |
|
F33 (837/637 only) |
Main heat exchanger anti freeze protection mode due to no switching signal from the air pressure switch | Check air pressure switch, fan, fan supply or flue system |
|
F37 defect (837/637 only) |
The rotary speed of the fan is too high or too low | Air pressure switch defect; fan defect; electronics |
|
F41 (837/637 only) |
No setting for the type of gas is stored | Set gas type in PCB (see page 30) |
| F42 | Faulty cable loom | Faulty or incorrect loom fitted |
| F43 | Faulty cable loom | Faulty or incorrect loom fitted |
| F60 | Electronic fault | Electronics defect |
| F61 | Electronic fault | Electronics defect |
| F62 | Flame rectification present 4 secs. after gas valve turns off | Check gas valve, burner tubes and injectors or electronics defect |
| F63 | EMC fault | EMC or electronics defect |
| F64 | Sensor or electronics fault | Check NTC's/connections or electronics defect |
| F65 | PCB processor temperature too high | Check earth connection or electronics defect |
| F66 | Display fault | Display defect; fault in the connection to the display; electronics defect |
| F67 | Electronic fault | Electronics defect |