Category
Boilers
Boiler fault codes with evidence-led diagnosis.
314 published entries
Brands in boilers
All brands
Published error entries
EdrA. O. Smith Edr on a hybrid heat pump water heater: not enough water in the tankHigh· A. O. Smith021Ariston 021 on a Nuos Plus heat pump water heater: possible refrigerant leakHigh· Ariston11Ariston 11 on a Velis water heater: water overheating detected by one sensorHigh· Ariston12Ariston 12 on a Velis water heater: general overheating from a board faultHigh· Ariston15Ariston 15 on a Velis water heater: overheating caused by lack of waterHigh· Ariston501Ariston 501 on a gas boiler: no flameHigh· Ariston601Ariston 601 on a gas boiler: flue gas extraction faultHigh· AristonE.01.04Baxi E.01.04 on a gas boiler: flame lost 5 times in 24 hoursHigh· BaxiE.01.17Baxi E.01.17 on a gas boiler: no water circulation, lockoutHigh· BaxiE.02.13Baxi E.02.13 on a gas boiler: external total shutdownHigh· BaxiE.02.35Baxi E.02.35 on a gas boiler: safety device disconnectedHigh· BaxiE.04.08Baxi E.04.08 on a gas boiler: maximum temperature exceededHigh· BaxiE.04.10Baxi E.04.10 on a gas boiler: no ignition after 4 attemptsHigh· BaxiE.04.12Baxi E.04.12 on a gas boiler: false flame detection faultHigh· BaxiE110Baxi E110 on a gas boiler: overheat safety thermostat trippedHigh· BaxiE125Baxi E125 on a gas boiler: no circulation safety lockoutHigh· BaxiE128Baxi E128 on a gas boiler: flame lostHigh· BaxiE129Baxi E129 on a gas boiler: flame loss during ignitionHigh· BaxiE130Baxi E130 on a gas boiler: flue NTC sensor overheatHigh· BaxiE133Baxi E133 fault: gas supply or ignition lockoutHigh· BaxiE134Baxi E134 on a gas boiler: gas valve blockedHigh· BaxiE160Baxi E160 on a gas boiler: fan faultHigh· BaxiE430Baxi E430 on a gas boiler: safety cut-off, no circulationHigh· BaxiE53Baxi E53 on a gas boiler: flue duct blockedHigh· BaxiA01Beretta A01 on a gas boiler: ACF module lockoutHigh· BerettaA02Beretta A02 on a gas boiler: limit thermostat alarmHigh· BerettaA03Beretta A03 on a gas boiler: fan speed alarmHigh· BerettaA09Beretta A09 on a gas boiler: heat exchanger cleaning or flue sensorHigh· BerettaA11Beretta A11 gas boiler: parasite flame temporary stopHigh· BerettaEABosch EA on gas tankless water heater: no flame detectedHigh· BoschLED 5Calorex LED 5 on Lévittas electric water heater: overheatHigh· Calorex101Chaffoteaux 101 on a gas boiler: overtemperature lockoutHigh· Chaffoteaux501Chaffoteaux 501 on a gas boiler: no flameHigh· Chaffoteaux601Chaffoteaux 601 on a gas boiler: flue sensor trippedHigh· ChaffoteauxA01Cointra A01 on a gas boiler: burner does not lightHigh· CointraA02Cointra A02 on a gas boiler: flame signal with burner offHigh· CointraA05Cointra A05 on a gas boiler: fan fault, boiler locked outHigh· CointraA06Cointra A06 on a gas boiler: no flame after ignitionHigh· CointraA07Cointra A07 on a gas boiler: flue gas temperature too highHigh· CointraA08Cointra A08 on a gas boiler: overheat protection trippedHigh· CointraA09Cointra A09 on a gas boiler: permanent overheat lockoutHigh· CointraA16Cointra A16 on gas water heater: gas valve or wiring faultHigh· CointraA51Cointra A51 on a gas water heater: air or flue duct blockedHigh· CointraA80Cointra A80 on a gas boiler: flame signal after valve closesHigh· CointraA88Cointra A88 on a gas boiler: combustion or gas valve errorHigh· CointraE1Cointra E1 on a TND electric water heater: dry heating faultHigh· CointraF05Cointra F05 on a gas water heater: fan fault, temporary lockoutHigh· CointraF20Cointra F20 on a gas water heater: combustion control faultHigh· Cointra