Home › Nefit error codes

Nefit Error Codes

Every Nefit code in the database, by appliance. Open a code for its causes, the checks to run in order, and how to clear it.

Boilers · 80 codes

Nefit Boilers

Code	Meaning	Fix level
`0Y 276` also: 0Y	The flow temperature sensor has measured a temperature above 95 °C	DIY checks first
`0Y 277` also: 0Y	The safety temperature sensor has measured a temperature above 95 °C	DIY checks first
`0Y 285` also: 0Y	The return temperature sensor has measured a temperature above 95 °C	DIY checks first
`2C 348` also: 2C	During hot water operation the flow temperature is above 85 °C	DIY checks first
`2E 207` also: 2E	The heating water pressure is too low (below 0.2 bar)	DIY-friendly
`2F 260` also: 2F	The flow temperature sensor measures no temperature rise after a burner start	DIY checks first
`2F 271` also: 2F	The temperature difference between the flow and safety temperature sensors is too large	DIY checks first
`2F 345` also: 2F	The flow temperature sensor measures no temperature rise after a burner start	DIY checks first
`2L 266` also: 2L	The pump test has failed: the pressure sensor sees the pump build up no pressure	DIY checks first
`2L 329` also: 2L	The pressure sensor measures no water flow	DIY checks first
`2P 212` also: 2P	The temperature measured by the flow or safety temperature sensor rises too quickly	DIY checks first
`2U 213` also: 2U	The measured temperature difference between the flow and return temperature sensors is too large	DIY checks first
`2U 349` also: 2U	The temperature difference between the flow and return sensors measured at low load is too large	DIY checks first
`2Y 281` also: 2Y	The pump is stuck or is running in air	DIY checks first
`2Y 282` also: 2Y	The control signal to the pump is missing	Call a professional
`3A 264` also: 3A	The fan control signal or supply voltage dropped out during operation	Call a professional
`3C 217` also: 3C	The fan runs irregularly during start-up	Call a professional
`3L 214` also: 3L	The fan does not run during the start-up phase	Call a professional
`3P 216` also: 3P	The fan runs too slowly	Call a professional
`3Y 215` also: 3Y	The fan runs too fast	Call a professional
`4A 218` also: 4A	The flow temperature sensor has measured a temperature above 105 °C	Call a professional
`4A 332` also: 4A	The flow temperature sensor has measured a temperature above 105 °C	Call a professional
`4C 224` also: 4C	An appliance thermostat (maximum or burner thermostat) has measured too high a temperature and is open	Call a professional
`4E 278` also: 4E	The boiler's sensor test has failed	Call a professional
`4E 347` also: 4E	The return temperature sensor has measured a higher heating water temperature than the flow temperature sensor; a restart follows after 10 minutes	DIY checks first
`4E 375` also: 4E	The contacts of the external sensor (for example a solar sensor) are short-circuited	Call a professional
`4E 376` also: 4E	The contacts of the external sensor (for example a solar sensor) are interrupted	Call a professional
`4F 219` also: 4F	The safety temperature sensor has measured a temperature above 105 °C	Call a professional
`4L 220` also: 4L	The contacts of the safety temperature sensor are short-circuited, or the sensor has measured a temperature above 130 °C	Call a professional
`4P 221` also: 4P	The contacts of the safety temperature sensor are interrupted	Call a professional
`4U 222` also: 4U	The contacts of the flow temperature sensor are short-circuited	Call a professional
`4Y 223` also: 4Y	The contacts of the flow temperature sensor are interrupted	Call a professional
`6A 227` also: 6A	Insufficient ionisation current was measured after the burner ignited: the boiler does not see a proper flame	Call a professional
`6C 306` also: 6C	An ionisation current was measured after the burner had gone out: the boiler still sees a flame that should not be there	Call a professional
`6L 229` also: 6L	Insufficient ionisation current was measured while burning: the flame drops out or is not seen properly	Call a professional
`7C 231` also: 7C	The mains voltage was interrupted during a locking fault	DIY checks first
`7H 328` also: 7H	There has been a brief interruption of the mains voltage	DIY checks first
`7L 261` also: 7L	The burner control unit is faulty	Call a professional
`7L 280` also: 7L	The burner control unit is faulty	Call a professional
`8U 364` also: 8U	The leak test carried out on the gas valve has failed	Call a professional
`8U 365` also: 8U	The leak test carried out on the gas valve has failed	Call a professional
`8Y 232` also: 8Y	The external switching contact is open	DIY checks first
`9A 235` also: 9A	The KIM is too new for the burner control unit	Call a professional
`9H 237` also: 9H	The burner control unit or the KIM is faulty	Call a professional
`9H 272` also: 9H	The burner control unit or the KIM is faulty	Call a professional
`9L 234` also: 9L	The contacts of the gas control block are interrupted	Call a professional
`9L 238` also: 9L	The burner control unit or the KIM is faulty	Call a professional
`9P 239` also: 9P	The burner control unit or the KIM is faulty	Call a professional
`9U 233` also: 9U	The burner control unit or the KIM is faulty	Call a professional
`C0 288` also: C0	The water pressure is too high, or the contacts of the pressure sensor are interrupted	Call a professional
`C0 289` also: C0	The contacts of the pressure sensor are short-circuited	Call a professional
`CA 286` also: CA	The return temperature sensor has measured a return temperature above 105 °C	Call a professional
`CU 240` also: CU	The contacts of the return temperature sensor are short-circuited	Call a professional
`CY 241` also: CY	The contacts of the return temperature sensor are interrupted	Call a professional
`E1 242` also: E1	The burner control unit or the KIM is faulty	Call a professional
`E1 243` also: E1	The burner control unit or the KIM is faulty	Call a professional
`E1 244` also: E1	The burner control unit or the KIM is faulty	Call a professional
`E1 245` also: E1	The burner control unit or the KIM is faulty	Call a professional
`E1 247` also: E1	The burner control unit or the KIM is faulty	Call a professional
`E1 248` also: E1	The burner control unit or the KIM is faulty	Call a professional
`E1 249` also: E1	The burner control unit or the KIM is faulty	Call a professional
`E1 255` also: E1	The burner control unit or the KIM is faulty	Call a professional
`E1 257` also: E1	The burner control unit or the KIM is faulty	Call a professional
`EA 246` also: EA	The burner control unit or the KIM is faulty	Call a professional
`EA 252` also: EA	The burner control unit or the KIM is faulty	Call a professional
`EA 253` also: EA	The burner control unit or the KIM is faulty	Call a professional
`EC 251` also: EC	The burner control unit or the KIM is faulty	Call a professional
`EC 256` also: EC	The burner control unit or the KIM is faulty	Call a professional
`EF 254` also: EF	The burner control unit or the KIM is faulty	Call a professional
`EH 250` also: EH	The burner control unit or the KIM is faulty	Call a professional
`EH 258` also: EH	The burner control unit or the KIM is faulty	Call a professional
`EH 262` also: EH	The burner control unit or the KIM is faulty	Call a professional
`EL 259` also: EL	The burner control unit or the KIM is faulty	Call a professional
`EL 279` also: EL	The burner control unit or the KIM is faulty	Call a professional
`EL 290` also: EL	The burner control unit or the KIM is faulty	Call a professional
`EY 263` also: EY	The burner control unit or the KIM is faulty	Call a professional
`H07`	The measured heating water pressure is too low; the output for heating and hot water operation is limited	DIY-friendly
`H11`	The hot water outlet temperature sensor is faulty; its function is taken over by the boiler software	Call a professional
`H13`	The set maintenance period has expired; maintenance is due	Not a fault
`H25`	The contacts of the pressure sensor are interrupted	Call a professional

More appliance types are being added. Codes vary by model and region.