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Error codes for Vaillant
11 manufacturer-linked boiler codes. Confirm exact model compatibility before using any guidance.
24 results
conVaillant Boiler con: Board-to-display communication faultVaillant · Boiler→F13Vaillant Gas boiler F13: Cylinder temperature sensor short circuitVaillant · Gas boiler→F20Vaillant Gas boiler F20: Overtemperature safety cut-outVaillant · Gas boiler→F22Vaillant Gas boiler F22: Insufficient heating water or low pressureVaillant · Gas boiler→F23Vaillant Gas boiler F23: Excessive flow/return temperature differenceVaillant · Gas boiler→F25Vaillant Gas boiler F25: Flue-gas temperature too highVaillant · Gas boiler→F27Vaillant Gas boiler F27: Flame detected while burner is offVaillant · Gas boiler→F28Vaillant Gas boiler F28: Ignition failure at start-upVaillant · Gas boiler→F29Vaillant Gas boiler F29: Flame lost during operation and re-ignition unsuccessfulVaillant · Gas boiler→F32Vaillant Boiler F32: Fan faultVaillant · Boiler→F49Vaillant Boiler F49: eBUS communication faultVaillant · Boiler→F61Vaillant Gas boiler F61: Gas valve control faultVaillant · Gas boiler→F62Vaillant Gas boiler F62: Gas valve shutoff or flame detection delayVaillant · Gas boiler→F63Vaillant Boiler F63: Electronics EEPROM faultVaillant · Boiler→F64Vaillant Boiler F64: Electronics / NTC faultVaillant · Boiler→F65Vaillant Boiler F65: Control board overtemperatureVaillant · Boiler→F67Vaillant Boiler F67: Flame sensing electronics faultVaillant · Boiler→F70Vaillant Boiler F70: Device identification mismatchVaillant · Boiler→F71Vaillant Boiler F71: Flow temperature sensor faultVaillant · Boiler→F72Vaillant Boiler F72: Flow/return sensor mismatchVaillant · Boiler→F73Vaillant Boiler F73: Water pressure sensor signal too lowVaillant · Boiler→F74Vaillant Boiler F74: Water pressure sensor signal too highVaillant · Boiler→F75Vaillant Gas boiler F75: No expected pressure change upon pump startVaillant · Gas boiler→F77Vaillant Boiler F77: Flue damper / condensate pump faultVaillant · Boiler→