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Boiler with display and pressure gauge
Boiler fault codes

Nefit boiler faults: fault codes, causes and parts (page 4 of 5)

Codes 451 to 600 of the 619 fault codes for Nefit. Looking for a specific code? Use the search on the first page.

Nefit boiler fault codes 451 to 600 of 619

The code list is split over 5 pages. Looking for a specific code? Use the search on the first page: it searches all 619 codes in one go.

CodeCause
6C 228An ionisation current was measured before the burner started.
6C 306An ionisation current was measured after the burner was extinguished.
6C 306Ionisation current fault: Ionisation current was measured after the burner went out.
6C 306Ionisation current fault: Ionisation current was measured after the burner went out.
6C 509The control unit is defective
6HThe ionisation (i.e. the flame) is lost shortly after ignition
6LThe ionisation (i.e. the flame) is lost while the appliance is running
6L 229Insufficient ionisation current has been measured during burning.
6L 229Ionisation current fault: Insufficient ionisation current was measured during the operating phase.
6P 269The ignition unit has been energised for too long.
6P 269The glow plug has been activated for longer than 10 minutes.
6Y 203Ionisation current fault The ionisation current is too high. is flashing at a frequency of 1 Hz. No central heating operation and no domestic hot water.
7AUBA defective Mains voltage or ModuLine thermostat is externally affected, Check the electrical network for voltage peaks that may be caused by UBA may be defective. Check the UBA by temporarily connecting another UBA.
7A 550The mains voltage is too low.
7CThe mains voltage is lost during a lockout fault or the reset button was pressed too briefly
7C 231The mains voltage was interrupted during a lockout fault.
7FFuse F3 faulty. UBA faulty 31 Short circuit in 24 V circuit (diverter valve or UBA terminal block). Locate the short circuit and replace fuse F3 in the UBA. Press reset until r appears on the display. 39 Mains voltage or ModuLine thermostat is being influenced externally: check the ModuLine thermostat. Check the electrical network for voltage peaks that may be caused by wind turbines and/or generators. UBA may be faulty. Check the UBA by temporarily connecting another UBA. Press reset until r appears on the display.
7FFuse F3 defective / UBA defective
7HUBA faulty Mains voltage or ModuLine thermostat is being influenced externally, Check the electrical network for voltage peaks that may d UBA may be faulty. Check the UBA by temporarily connecting another UBA.
7HUBA defective Mains voltage or ModuLine thermostat is externally affected, Check the electrical network for voltage peaks that may be caused by UBA may be defective. Check the UBA by temporarily connecting another UBA.
7H 328There has been a brief interruption of the mains voltage.
7LUBA defective: Mains voltage or ModuLine thermostat is externally affected.
7L 261UBA fault: The UBA 3 is defective.
7L 261The burner control unit is defective.
7L 280The burner control unit is defective.
7L 280UBA fault: The UBA 3 is defective.
8 YConnection in wiring harness interrupted
810Domestic hot water temperature has not risen for 2 hours
815Temperature sensor open diverter defective
888Operating phase Display test during the start-up phase.
8C 373The burner thermostat has measured too high a temperature more often than permitted.
8C 374Insufficient ionisation current has been measured during burning more often than permitted.
8U 364The gas valve leak test carried out has failed.
8Y 232The external switching contact is open.
8Y 232Operating phase: Display test during the start-up phase.
9UBA 3 or KIM fault
9 233The burner control unit or the KIM is defective.
9.Internal UBA error
9AInternal UBA error
9A 235The fitted jumper does not correspond to the appliance type.
9A 235The KIM is too new for the burner control unit.
9H 237The burner control unit or the KIM is defective.
9H 267The burner control unit or the KIM is defective.
9H 272The burner control unit or the KIM is defective.
9L 234The contacts of the gas valve are open-circuit.
9L 238The burner control unit or the KIM is defective.
9L 238The control unit is defective.
9P 239The burner control unit or the KIM is defective.
9U 233The burner control unit or the KIM is defective.
=H 201The boiler is firing and is in domestic hot water mode.
=H 201The boiler is operating for hot water.
C 240The contacts of the return temperature sensor are short-circuited.
C0 288The water pressure is too high (> 5.7 bar) or the contacts of the pressure sensor are open-circuit.
C0 288The water pressure is too high (> 5 bar) or the contacts of the pressure sensor are open circuit.
C0 289The contacts of the pressure sensor are short-circuited.
CA 286The return temperature sensor has measured a central heating return temperature higher than 105°C.
CA 286The return temperature sensor has measured a heating return temperature higher than 105 °C.
CU 240The contacts of the return temperature sensor are short-circuited.
CY 241The contacts of the return temperature sensor are open-circuit.
E 242UBA 3 or KIM fault
E 243UBA 3 or KIM fault
E 244UBA 3 or KIM fault
E 245UBA 3 or KIM fault
E 246UBA 3 or KIM fault
E 247UBA 3 or KIM fault
E 248UBA 3 or KIM fault
E 249UBA 3 or KIM fault
E 250UBA 3 or KIM fault
E 251UBA 3 or KIM fault
E 252UBA 3 or KIM fault
E 253UBA 3 or KIM fault
E 254UBA 3 or KIM fault
E 255UBA 3 or KIM fault
E 256UBA 3 or KIM fault
E 257UBA 3 or KIM fault
E 258UBA 3 or KIM fault
E 259UBA 3 or KIM fault
E 260UBA 3 or KIM fault
E 261UBA 3 or KIM fault
E 262UBA 3 or KIM fault
E 263UBA 3 or KIM fault
E 264UBA 3 or KIM fault
E 265UBA 3 or KIM fault
E 266UBA 3 or KIM fault
E 267UBA 3 or KIM fault
E 268UBA 3 or KIM fault
E 269UBA 3 or KIM fault
E 270UBA 3 or KIM fault
E 271UBA 3 or KIM fault
E 272UBA 3 or KIM fault
E 273UBA 3 or KIM fault
E 274UBA 3 or KIM fault
E 275UBA 3 or KIM fault
E 276UBA 3 or KIM fault
E 277UBA 3 or KIM fault
E 278UBA 3 or KIM fault
E 279UBA 3 or KIM fault
E 280UBA 3 or KIM fault
E 281UBA 3 or KIM fault
E 282UBA 3 or KIM fault
E 283UBA 3 or KIM fault
E 284UBA 3 or KIM fault
E 285UBA 3 or KIM fault
E 286UBA 3 or KIM fault
E 287UBA 3 or KIM fault
E AUBA defective Mains voltage or ModuLine thermostat is externally affected, Check the electrical network for voltage peaks that may be caused by UBA may be defective. Check the UBA by temporarily connecting another UBA.
E1 242The burner control unit or the KIM is defective.
E1 243The burner control unit or the KIM is defective.
E1 244The burner control unit or the KIM is defective.
E1 245The burner control unit or the KIM is defective.
E1 247The burner control unit or the KIM is defective.
E1 248The burner control unit or the KIM is defective.
E1 249The burner control unit or the KIM is defective.
E1 255The burner control unit or the KIM is defective.
E1 257The burner control unit or the KIM is defective.
EA 246The burner control unit or the KIM is defective.
EA 252The burner control unit or the KIM is defective.
EA 253The burner control unit or the KIM is defective.
EC 251The burner control unit or the KIM is defective.
EC 256The burner control unit or the KIM is defective.
EE 554The control unit detects an internal error.
EE 657The control unit detects an internal error.
EF 254The burner control unit or the KIM is defective.
EH 250The burner control unit or the KIM is defective.
EH 258The burner control unit or the KIM is defective.
EH 262The burner control unit or the KIM is defective.
EL 259The burner control unit or the KIM is defective.
EL 259The control unit is defective.
EL 279The burner control unit or the KIM is defective.
EL 279The control unit is defective.
EL 290The burner control unit or the KIM is defective.
EL 290UBA 3 or KIM fault
EP 287The burner control unit or the KIM is defective.
EY 263The burner control unit or the KIM is defective.
F 5Set required pump overrun time
No displayThe boiler receives no power.
No displayThe boiler receives no power.
H 200The boiler is in central heating mode.
H 200The boiler is in central heating mode
H 200Operating phase central heating mode The boiler is in central heating mode
H 200The boiler is in central heating mode
H 200The boiler is in central heating mode
H 200The boiler is in central heating mode
H 201The boiler is in manual mode
H 201Operating phase manual central heating mode The boiler is in manual mode
H 7The water pressure in the central heating system is too low (lower than 0.8 bar)
H--No service interval has been set.
H03Service message: The number of burner hours for the next service has elapsed.
H07The measured central heating water pressure is too low
H07The central heating water pressure is lower than 1.0 bar during standby or lower than 1.3 bar during operation

Nefit parts are available from Instalpunt. Back to the first page with the most searched codes and frequently asked questions.

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