Nibe Fault Codes

Select a fault code to see its meaning, common causes and how to fix it.

1 Nibe Alarm Code 1 indicates that the heat pump's outdoor temperature sensor, known as BT1, is either not connected or… Read more →
11 Fault code 11 on Nibe heat pumps indicates a problem with the BT11 sensor — the temperature probe fitted to the… Read more →
155 Fault code 155 is the Hot Gas Alarm. It activates when the discharge temperature sensor BT14 detects that the hot gas… Read more →
2 Alarm code 2 on Nibe heat pumps indicates that the BT2 sensor — which monitors the temperature of water returning from… Read more →
3 Fault code 3 on a Nibe heat pump indicates a problem with the BT3 sensor, which monitors the temperature of water… Read more →
40 Nibe fault code 40 has two distinct meanings depending on your model. On ground-source and older systems, code [40]… Read more →
41 Fault code 41 indicates that phase 2 of the three-phase electrical supply to the compressor has either dropped… Read more →
42 Fault code 42 indicates that the third phase of the electrical supply reaching the compressor has either disappeared… Read more →
43 Fault code 43 on a Nibe heat pump indicates that the three-phase electrical supply is connected in the wrong order. The… Read more →
44 Fault code 44 on a Nibe heat pump indicates that the soft start card has overheated or that its protective fuses have… Read more →
45 Nibe alarm code 45 indicates that the single-phase motor protection cut-out switch inside the heat pump has tripped,… Read more →
50 Fault code 50 on a Nibe heat pump indicates that the high-pressure switch has been activated more than once in quick… Read more →
51 Fault code 51 indicates that the refrigerant circuit pressure has dropped below an acceptable threshold. On the F1145,… Read more →
52 Alarm 52 means the built-in safety thermostat (temperature limiter) protecting the immersion heater has detected… Read more →
53 Fault code 53 on a Nibe ground-source heat pump indicates that the brine (collector) circuit level or pressure switch… Read more →
54 Fault code 54 on a Nibe heat pump indicates that the motor protection breaker has tripped. This is a built-in safety… Read more →
55 Fault code 55 on a Nibe heat pump is a Hot Gas Alarm. The unit's controls have detected that the discharge (hot gas)… Read more →
58 Fault code 58 on Nibe heat pumps indicates that a pressure switch has tripped — either on the high-pressure or… Read more →
6 Fault Code 6 on a Nibe heat pump indicates a problem with the BT6 sensor — the primary temperature sensor responsible… Read more →
60 Alarm 60 (Low HTF Out) activates when the outgoing Heat Transfer Fluid (brine) temperature drops below the minimum… Read more →
7 Fault code 7 on Nibe heat pumps indicates that the BT7 temperature sensor — which monitors the peak or top temperature… Read more →