BoilerFaultCodesPotterton C2 Fault Code
The Potterton C2 fault code means: your boiler is working correctly but has reached its maximum temperature for the moment and is pausing until it needs to fire up again.. It appears on 1 Potterton model in our database.
Technical description: Boiler operating but up to temperature
What causes the Potterton C2 fault?
This occurs when the boiler water has reached the maximum temperature set on the control dial or by the thermostat. The system pauses the burner temporarily because it has successfully heated the water to the required level and needs to wait for the temperature to drop before firing again. It is a sign that the boiler is managing its heat output efficiently rather than a mechanical failure.
This code is more frequent during spring and autumn when the heating is on but the outside temperature is mild, causing the house to reach temperature quickly.
DIY fix possible
No action is required as this is a normal status code.Ensure your room thermostat is turned up if the house is still cold.Check that your radiator valves are open to allow heat to circulate.
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Gas Safe Register →Potterton models that show the C2 fault code
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Source
Potterton C2 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026