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Heat pumps · Error codes

Firebird heat pump error codes

Firebird · A niche brand in the UK. 26 codes across 1 product family, each taken from the manufacturer’s manuals. Firebird technical support ↗

Find a Firebird engineer →26 codes · reviewed 23 September 2026

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Type the code on your display or a word from its meaning. Each code opens its own page with what it means, whether it is safe and what you can check.

26 codes

CodeMeaningStops?Homeowner check?
3
Transmission alarm (not outdoor unit detected)
Not statedYes
11
Water inlet thermistor anomaly (THMwi)
Not statedYes
12
Water outlet thermistor anomaly (THMwo)
Not statedYes
13
Indoor liquid pipe temp thermistor anomaly (THMl)
Not statedYes
14
Indoor gas pipe temp thermistor anomaly (THMg)
Not statedYes
15
Water circuit 2 thermistor anomaly (THMwo2)
Not statedYes
16
Water DHW thermistor anomaly (THMdhwt)
Not statedYes
17
Auxiliary sensor 2 thermistor anomaly (THMaux2)
Not statedYes
18
Auxiliary sensor 1 thermistor anomaly (THMaux1)
Not statedYes
25
Auxiliary sensor 3 thermistor anomaly (THMaux3)
Not statedYes
40
Incorrect unit controller setting
Not statedYes
70
Hydraulic alarm flow and water pump malfunction
YesYes
73
Mixing over-temperature limit protection for mixed circuit
Not statedYes
74
Unit over-temperature limit protection
YesYes
75
Freeze protection by cold water inlet/outlet temperature detection
Not statedYes
76
Freeze protection stop by indoor liquid temperature thermistor
Not statedYes
77
Receiver communication failure
Not statedYes
78
RF communication failure
Not statedYes
79
Unit capacity setting error
Not statedYes
80
Unit controller - H-LINK - RCS transmission error (if no H-LINK, RCS has no power)
Not statedYes
81
'Momentary power interruption' or 'Low voltage detected'
YesYes
83
Hydraulic alarm pressure
YesYes
157
Inverter communication abnormality thermistor
Not statedYes
202
Wrong settings of controller
Not statedYes
203
Slave PC-ARFHE stops answering to master controller
Not statedYes
204
Indoor unit stops answering to master controller
Not statedYes