Equipment guide
Boiler error codes
Codes are manufacturer-specific. Choose the exact brand shown on your equipment.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E001 as heat exchanger overheat. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E003 as ignition failure. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E004 as false flame. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E012 as flame loss. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E016 as heat exchanger overheat. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E030 as exhaust overheat. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E031 as burner overheat. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E046 as heat exchanger thermistor error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E047 as exhaust thermistor error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E060 as abnormal dual venturi. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E109 as abnormal fan motor. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E110 as exhaust blockage. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E205 as heating supply temperature sensor error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E218 as heating return temperature sensor error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E278 as external supply sensor not detected. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E279 as external return sensor not detected. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NFB-H Condensing Boilers Installation Manual identifies E291 as heating return temperature exceeds the heating supply temperature. This meaning is limited to the documented NFB-H condensing boiler.
The official NFB-H Condensing Boilers Installation Manual identifies E302 as low water pressure. This meaning is limited to the documented NFB-H condensing boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E351 as abnormal automatic feeder valve. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E352 as high water pressure. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E353 as water pressure sensor error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E407 as domestic hot-water outlet sensor error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E421 as domestic cold-water inlet sensor error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E434 as abnormal water-adjustment valve. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E439 as no domestic water flow detected. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E441 as domestic hot-water outlet sensor 2 error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E445 as abnormal mixing valve. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NFB-H Condensing Boilers Installation Manual identifies E480 as domestic hot-water tank sensor not detected. This meaning is limited to the documented NFB-H condensing boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E515 as abnormal pcb. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E517 as abnormal dip switch. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E594 as abnormal eeprom. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E615 as abnormal memory. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E736 as cascade communication error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E740 as outdoor sensor not detected. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E761 as pump aquastat not detected. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E762 as vent pipe not fully inserted. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E773 as improper gas type detected. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E777 as low-water cutoff activated. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E782 as front-panel communication error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E784 as zone-controller communication error. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E786 as improper front panel. This meaning is limited to the documented NCB-H condensing combi-boiler.
The official NCB-H Condensing Combi-Boilers Installation and Operation Manual identifies E788 as incorrect gas-type setting. This meaning is limited to the documented NCB-H condensing combi-boiler.