1P1, 1P2, 1P3, 101, 102, 103, 104, 105, 106, 107 Fault codes.
The fault code explanations for all the above fault codes are below, with the fault-finding guidance on page 43.
1P1 Description: Flow check 1 error
Cause: Change in the supply temperature between 7°C and 15°C degrees in 1 second. A rapid increase of the supply
temperature can mean that the water flow over the boiler is falling sharply and can be an indication of overheating.
1P2 Description: Flow check 3 error
Cause: Flow temperature T1 – Return temperature T2 > 55°C.
1P3 Description: Flow check 4 error
Cause: The return sensor T2 measures a water temperature that is 10°C higher than the supply temperature.
101 Description: Over Temperature T1 or T2 Sensor Failure
Cause: The flow sensor T1 or Return sensor T2 > 100°C for 3 seconds.
103 Description: Flow check error 3 times
Cause: 3 times in 15 minutes flow check error ending with a 1P1 (rapid change of supply or return water
temperature). A rapid increase in temperature can mean that the flow through the boiler drops sharply, which can
result in overheating.
104 Description: Flow check 2 error
Cause: Very fast temperature change between 7°C and 15°C degrees within 1 second on the flow sensor T1 or the
return sensor T2.
105 Description: Flow check 3 times wrong
Cause: Three flow check failures within 15 minutes ending with a 1P4 (pressure below 1 bar). Normally a T1 and T2
sensor error, ∆T rise to 37°C within 15 minutes.
106 Description: Flow check 3 times wrong
Cause: Three flow check failures within 15 minutes. The return temperature is more than 35°C higher than the flow
temperature with the burner on. T2 temperature is 10°C higher than T1 for more than 20 seconds.
107 Description: Flow check 5 error
Cause: Normally a flow sensor T1 or return sensor T2 malfunction or an external heat source that
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