BoilerFaultCodesMaxol 1 Fault Code
The Maxol 1 fault code means: your boiler has become too hot and has automatically shut down to prevent damage to the internal components.. It appears on 1 Maxol model in our database.
Technical description: Abnormal temperatures will cause the appliance to go to lockout, the digital display will show code ‘1’ and the error light will be lit. (Overheat protection)
DIY fix possible
Wait for the boiler to cool down for at least 20 minutes.Check that all radiator valves are fully open and there are no obstructions to water flow.Press the 'Reset' button on the control panel to clear the lockout.
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Maxol models that show the 1 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Maxol 1 fault code information on this page is sourced and cross-checked against the official Maxol service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026