Independent technical reference
Vaillant
47 published entries
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Equipment covered
Documented codes
Air-to-water heat pump 4
F1117Vaillant F.1117 on an aroTHERM plus heat pump: compressor phase failureHigh· Heat pumpsF718Vaillant F.718 on an aroTHERM plus heat pump: outdoor fan blockedMedium· Heat pumpsF788Vaillant F.788 on an aroTHERM plus heat pump: building circuit pump faultMedium· Heat pumpsF741Vaillant F.741 heat pump fault: return too cold during defrostLow· Heat pumps
Tankless gas water heater 5
F171Vaillant F.171 on a gas water heater: fan or flue faultHigh· BoilersF33Vaillant F.33 on a gas water heater: air pressure switch errorHigh· BoilersF37Vaillant F.37 on a gas water heater: fan speed deviationHigh· BoilersF164Vaillant F.164 on a gas water heater: 45 minute run limitMedium· BoilersF168Vaillant F.168 on a gas water heater: water leak sensor faultMedium· Boilers
Gas boiler 38
F20Vaillant boiler F20: safety temperature limiter detected excessive flow or return temperatureHigh· BoilersF22Vaillant boiler F22: too little heating water or system pressureHigh· BoilersF23Vaillant boiler F23: flow and return temperature difference is too largeHigh· BoilersF24Vaillant boiler F24: flow temperature is rising faster than the safe gradientHigh· BoilersF25Vaillant F.25 on a gas boiler: flue gas temperature too highHigh· BoilersF26Vaillant F.26 on a gas boiler: gas valve not workingHigh· BoilersF27Vaillant boiler F27: a flame signal exists while the gas valve should be closedHigh· BoilersF28Vaillant boiler F28: no valid flame was detected during ignitionHigh· BoilersF29Vaillant boiler F29: the operating flame was lost and reignition failedHigh· BoilersF32Vaillant F.32 on a gas boiler: fan faultHigh· BoilersF35Vaillant F35 on a gas boiler: air and flue duct faultHigh· BoilersF42Vaillant F42 on a gas boiler: gas coding resistor faultHigh· BoilersF54Vaillant F54 fault: insufficient gas supply at boiler startHigh· BoilersF55Vaillant F55 on a gas boiler: carbon monoxide sensor faultHigh· BoilersF56Vaillant F56 on a gas boiler: carbon monoxide limit exceededHigh· BoilersF57Vaillant F57 boiler fault: comfort mode combustion errorHigh· BoilersF61Vaillant boiler F61: gas-valve control did not operate in its required timingHigh· BoilersF62Vaillant boiler F62: flame switch-off was detected after the allowed delayHigh· BoilersF64Vaillant F.64 on a gas boiler: electronics or sensor faultHigh· BoilersF67Vaillant F.67 on a gas boiler: implausible flame signalHigh· BoilersF68Vaillant F.68 on a gas boiler: unstable flame signalHigh· BoilersF70Vaillant boiler F70: appliance coding does not match the installed control hardwareHigh· BoilersF72Vaillant boiler F72: flow and return sensors report an implausible differenceHigh· BoilersF75Vaillant boiler F75: the pressure sensor did not detect the expected change when the pump startedHigh· BoilersF77Vaillant F.77 on a gas boiler: flue flap or condensate pumpHigh· BoilersF83Vaillant F83 fault: too little temperature rise after burner startHigh· BoilersF00Vaillant F.00 on an ecoTEC boiler: flow sensor interruptionMedium· BoilersF01Vaillant F.01 on a gas boiler: return sensor interruptionMedium· BoilersF10Vaillant F.10 on a gas boiler: flow sensor short circuitMedium· BoilersF11Vaillant F.11 on a gas boiler: return sensor short circuitMedium· BoilersF13Vaillant F13 boiler fault: hot water cylinder sensor shortMedium· BoilersF49Vaillant F.49 on a gas boiler: undervoltage on the eBUSMedium· BoilersF65Vaillant F.65 on a gas boiler: electronics running too hotMedium· BoilersF73Vaillant F.73 on a gas boiler: water pressure sensor signal too lowMedium· BoilersF74Vaillant F.74 on a gas boiler: water pressure too highMedium· BoilersF81Vaillant F81 on a gas boiler: cylinder charging incompleteMedium· BoilersF82Vaillant F82 on a gas boiler: powered anode circuit faultMedium· BoilersF84Vaillant F.84 on a gas boiler: implausible flow return differenceMedium· Boilers