Ravenheat
Fault Codes

Listed below are the common Ravenheat fault codes as described by the boiler manufacturer along with a possible cause.

Ravenheat Boiler Fault Codes

Fault Code	System Behaviour
F73	Heating circuit pressure sensor fault
F74	Heating circuit pressure sensor fault
F76	Thermal fuse fault
F77	Fault in gas valve motor
F83	No water in the installation – the temperature does not increase when the burner is lit
F84	Permanent temperature difference betweenF flow and return heating sensors
F85	Flow and return heating sensors fault
F86	Underfloor heating contact fault
ERR	User interface fault
04	Domestic hot water (DHW) sensor faulty

Fault Code	System Behaviour
17	Possible issue with fan voltage
01	Boiler failed to ignite – problem with gas valve operation, fan failing to start, ignition control board and cables
28	Failed low water – pressure switch or pump, possible issue with pump, incorrect system pressure or the low water switch pressure needs replacing
12	Failed heating sensor – issue with heating sensor and could need replacing
04	Failed overheat – the overheat thermostat needs checking
30	Failed flue temperature – check operating system
31	Failed flue temperature – the flue sensor needs checking or replacing
02	Failed temperature – try resetting the boiler

Fault Code	System Behaviour
E02	Problem with the pump circulation
E03	Flow sensor damaged
E04	Domestic hot water (DHW) sensor damaged
E05	Problem with fan – possibly no signal
E06	Central heating (CH) sensor is overheating
E08	Low water pressure
E09	Overheat sensor overheating
E10	High water pressure
E13	Software error
E21	Central heating (CH) return sensor overheating
E22	Flue sensor overheating
E23	Flue sensor damaged
E24	Central heating return sensor error – possibly damaged
E25	Main heat exchanger frozen
E29	Domestic hot water (DHW) sensor overheating error
E31	OpenTherm communication error
E41	Different flow/return temperatures
E42	Different temperature error
E43	Different temperature error
E44	Different temperature error
E46	Water pressure sensor error – could be open or short

Different temperature error

Fault Code	System Behaviour
02E	Problem with the pump circulation
03E	Flow sensor damaged
04E	Domestic hot water (DHW) sensor damaged
05E	Problem with fan, possibly no signal
06E	Central heating sensor is overheating
08E	Low water pressure
09E	Overheat sensor overheating
10E	High water pressure error
13E	Software error
21E	Central heating return sensor overheating
22E	Flue sensor overheating
23E	Flue sensor damaged
24E	Central heating return sensor error, possibly damaged
25E	Main heat exchanger frozen
29E	D.H/W sensor overheating error
31E	OpenTherm (OT) communication error
41E	Different temperature between flow and return
42E	Different temperature error
43E
44E	Different temperature error
46E	Water pressure sensor error, could be open or short