BoilerFaultCodesMaxol 4 Fault Code
The Maxol 4 fault code means: your boiler has failed to light after several attempts and has locked itself out for safety.. It appears on 1 Maxol model in our database.
Technical description: In the event of failure during an ignition sequence, (5 attempts), the digital display displays error code ‘4’ and the error light will be lit.
DIY fix possible
Check that your gas supply is turned on at the meterIf you have a prepaid gas meter, ensure it has creditPress the reset button on the control panel to attempt a restart
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A cover plan would handle faults like 4: no call-out fees, no surprise bills.
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Maxol models that show the 4 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Maxol 4 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