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Boilers Error Codes
Fault codes for boilers from every brand in the database, with the meaning of each code. Choose your brand for the full list with fix levels, or open a code directly.
Intergas Boilers
31 codes · Intergas Boiler Error Codes: Full List
Intergas 1The boiler gets too hot: the heat cannot be carried away (insufficient flow)Intergas 10Flow sensor S1 is open circuit (no signal)Intergas 11Short circuit in flow sensor S1Intergas 12Flow sensor S1 reads a sudden temperature drop of 10 °C within 1 secondIntergas 13Flow sensor S1 reads a sudden temperature rise of 10 °C within 1 secondIntergas 14Flow sensor S1 reads no temperature change while the boiler is operatingIntergas 2Flow and return sensors (S1 and S2) are in the wrong location or swappedIntergas 27Short circuit in the outdoor sensor (outside temperature sensor)Intergas 29Gas valve relay fault (ignition module)Intergas 30Gas valve relay fault (PCB or wiring to the gas valve)Intergas 4No flame signal: the burner does not ignite or the flame is not detectedIntergas 5Poor flame signal: the flame is not detected properly while burningIntergas 6Flame detection fault: a flame is reported when there should be none (false flame)Intergas 8Incorrect fan speed: the fan runs too slowlyIntergas F000Heat exchanger sensor S0 is faultyIntergas F001Temperature too high during central heating operationIntergas F002Temperature too high during hot water operationIntergas F003Flue gas temperature too highIntergas F004No flame during start-upIntergas F005Flame failure during operation: the flame drops out or the flame signal is too weakIntergas F006Flame simulation: a flame is reported when there should be noneIntergas F007No or insufficient ionisation current: the flame is not detected properlyIntergas F009Internal fault in the burner control unitIntergas F010Sensor fault S0: the heat exchanger sensor does not read properlyIntergas F011Sensor fault S0: the heat exchanger sensor does not read properlyIntergas F012Sensor fault S5: the flue gas sensor does not read properlyIntergas F018Flue outlet and/or air inlet blockedIntergas F019Fault in the BMM (burner management module)Intergas F027Short circuit in outdoor sensor S6Intergas F030Sensor fault S3: the hot water sensor does not read properlyIntergas F031Sensor fault S1: the heating flow sensor does not read properly
Remeha Boilers
49 codes · Remeha Boiler Error Codes: Full List
Remeha E.00.04Return temperature sensor is disconnected or reads below its range (sensor open)Remeha E.00.05Return temperature sensor is short-circuited or reads above its rangeRemeha E.00.06The return temperature sensor is expected but not detected (no connection)Remeha E.00.07The difference between the return temperature and the flow temperature is too largeRemeha E.00.16Hot water tank sensor (domestic hot water) is disconnected or reads below its rangeRemeha E.00.17Hot water tank sensor (domestic hot water) is short-circuited or reads above its rangeRemeha E.01.04Flame failure five times: the flame has dropped out repeatedlyRemeha E.01.11The fan speed is outside its normal operating rangeRemeha E.01.12The return temperature is higher than the flow temperature (flow and return swapped)Remeha E.02.13The blocking input of the control is active (locking)Remeha E.02.15Time-out of the external CSU (no answer from the settings memory)Remeha E.02.17Communication error with the safety core in the gas valve control (feedback time exceeded)Remeha E.02.32Automatic topping up of the system takes too long (feedback time exceeded)Remeha E.02.35A critical safety device has been disconnected (communication fault)Remeha E.02.39Insufficient pressure rise after automatic topping upRemeha E.02.47The connection to the function groups has failed (function group not found)Remeha E.04.01Flow temperature sensor is short-circuited or reads above its rangeRemeha E.04.02Flow temperature sensor is disconnected or reads below its range (sensor open)Remeha E.04.03The measured temperature is above the safety limitRemeha E.04.04Flue gas temperature sensor is short-circuited or reads above its rangeRemeha E.04.05Flue gas temperature sensor is disconnected or reads below its range (sensor open)Remeha E.04.07Deviation between flow sensor 1 and flow sensor 2Remeha E.04.08The safety input is open (air pressure differential switch operated)Remeha E.04.09Deviation between flue gas sensor 1 and flue gas sensor 2Remeha E.04.10Five failed burner starts detectedRemeha E.04.11The gas valve check (VPS) has failed: the valve leak test does not passRemeha E.04.12False flame detected before the burner startsRemeha E.04.13The fan speed is outside its normal operating rangeRemeha E.04.15The flue pipe is blockedRemeha E.04.17The drive of the gas valve is faulty (gas valve fault)Remeha E.04.23Internal locking of the gas valve controlRemeha H.01.00Communication error with the safety core of the controlRemeha H.01.05Maximum difference between flow and return temperature exceededRemeha H.01.08The heat exchanger temperature rises too quickly (maximum temperature gradient exceeded)Remeha H.01.09Gas pressure too low (gas pressure switch operated)Remeha H.01.14The flow temperature has exceeded the maximum operating valueRemeha H.01.21The flow temperature rises too quickly during hot water operation (maximum DHW temperature gradient exceeded)Remeha H.02.02The boiler is waiting for the configuration number (configuration error)Remeha H.02.03Configuration error: the configuration number is unknown or incorrectRemeha H.02.04Parameter error: the factory settings are not in orderRemeha H.02.05The settings memory (CSU) does not match the control type (CU)Remeha H.02.09Partial blocking: the blocking input is active (frost protection keeps working)Remeha H.02.10Full blocking: the blocking input is active (without frost protection)Remeha H.02.12The enable signal from the external control did not arrive in time (waiting time expired)Remeha H.02.70The test of the external heat recovery unit has failedRemeha H.03.01No valid data received from the control (communication error with the CU-GH)Remeha H.03.02The measured ionisation current is too low: flame failure during operationRemeha H.03.05Internal blocking in the gas valve control (fault in the safety core)Remeha H.03.17The periodic safety check is being carried out
Nefit Boilers
80 codes · Nefit Boiler Error Codes: Full List
Nefit 0Y 276The flow temperature sensor has measured a temperature above 95 °CNefit 0Y 277The safety temperature sensor has measured a temperature above 95 °CNefit 0Y 285The return temperature sensor has measured a temperature above 95 °CNefit 2C 348During hot water operation the flow temperature is above 85 °CNefit 2E 207The heating water pressure is too low (below 0.2 bar)Nefit 2F 260The flow temperature sensor measures no temperature rise after a burner startNefit 2F 271The temperature difference between the flow and safety temperature sensors is too largeNefit 2F 345The flow temperature sensor measures no temperature rise after a burner startNefit 2L 266The pump test has failed: the pressure sensor sees the pump build up no pressureNefit 2L 329The pressure sensor measures no water flowNefit 2P 212The temperature measured by the flow or safety temperature sensor rises too quicklyNefit 2U 213The measured temperature difference between the flow and return temperature sensors is too largeNefit 2U 349The temperature difference between the flow and return sensors measured at low load is too largeNefit 2Y 281The pump is stuck or is running in airNefit 2Y 282The control signal to the pump is missingNefit 3A 264The fan control signal or supply voltage dropped out during operationNefit 3C 217The fan runs irregularly during start-upNefit 3L 214The fan does not run during the start-up phaseNefit 3P 216The fan runs too slowlyNefit 3Y 215The fan runs too fastNefit 4A 218The flow temperature sensor has measured a temperature above 105 °CNefit 4A 332The flow temperature sensor has measured a temperature above 105 °CNefit 4C 224An appliance thermostat (maximum or burner thermostat) has measured too high a temperature and is openNefit 4E 278The boiler's sensor test has failedNefit 4E 347The return temperature sensor has measured a higher heating water temperature than the flow temperature sensor; a restart follows after 10 minutesNefit 4E 375The contacts of the external sensor (for example a solar sensor) are short-circuitedNefit 4E 376The contacts of the external sensor (for example a solar sensor) are interruptedNefit 4F 219The safety temperature sensor has measured a temperature above 105 °CNefit 4L 220The contacts of the safety temperature sensor are short-circuited, or the sensor has measured a temperature above 130 °CNefit 4P 221The contacts of the safety temperature sensor are interruptedNefit 4U 222The contacts of the flow temperature sensor are short-circuitedNefit 4Y 223The contacts of the flow temperature sensor are interruptedNefit 6A 227Insufficient ionisation current was measured after the burner ignited: the boiler does not see a proper flameNefit 6C 306An ionisation current was measured after the burner had gone out: the boiler still sees a flame that should not be thereNefit 6L 229Insufficient ionisation current was measured while burning: the flame drops out or is not seen properlyNefit 7C 231The mains voltage was interrupted during a locking faultNefit 7H 328There has been a brief interruption of the mains voltageNefit 7L 261The burner control unit is faultyNefit 7L 280The burner control unit is faultyNefit 8U 364The leak test carried out on the gas valve has failedNefit 8U 365The leak test carried out on the gas valve has failedNefit 8Y 232The external switching contact is openNefit 9A 235The KIM is too new for the burner control unitNefit 9H 237The burner control unit or the KIM is faultyNefit 9H 272The burner control unit or the KIM is faultyNefit 9L 234The contacts of the gas control block are interruptedNefit 9L 238The burner control unit or the KIM is faultyNefit 9P 239The burner control unit or the KIM is faultyNefit 9U 233The burner control unit or the KIM is faultyNefit C0 288The water pressure is too high, or the contacts of the pressure sensor are interruptedNefit C0 289The contacts of the pressure sensor are short-circuitedNefit CA 286The return temperature sensor has measured a return temperature above 105 °CNefit CU 240The contacts of the return temperature sensor are short-circuitedNefit CY 241The contacts of the return temperature sensor are interruptedNefit E1 242The burner control unit or the KIM is faultyNefit E1 243The burner control unit or the KIM is faultyNefit E1 244The burner control unit or the KIM is faultyNefit E1 245The burner control unit or the KIM is faultyNefit E1 247The burner control unit or the KIM is faultyNefit E1 248The burner control unit or the KIM is faultyNefit E1 249The burner control unit or the KIM is faultyNefit E1 255The burner control unit or the KIM is faultyNefit E1 257The burner control unit or the KIM is faultyNefit EA 246The burner control unit or the KIM is faultyNefit EA 252The burner control unit or the KIM is faultyNefit EA 253The burner control unit or the KIM is faultyNefit EC 251The burner control unit or the KIM is faultyNefit EC 256The burner control unit or the KIM is faultyNefit EF 254The burner control unit or the KIM is faultyNefit EH 250The burner control unit or the KIM is faultyNefit EH 258The burner control unit or the KIM is faultyNefit EH 262The burner control unit or the KIM is faultyNefit EL 259The burner control unit or the KIM is faultyNefit EL 279The burner control unit or the KIM is faultyNefit EL 290The burner control unit or the KIM is faultyNefit EY 263The burner control unit or the KIM is faultyNefit H07The measured heating water pressure is too low; the output for heating and hot water operation is limitedNefit H11The hot water outlet temperature sensor is faulty; its function is taken over by the boiler softwareNefit H13The set maintenance period has expired; maintenance is dueNefit H25The contacts of the pressure sensor are interrupted