BoilerFaultCodesWhat the manual says
Manufacturer manualProduct in waiting period/operating block function due to water deficiency (flow/return spread too large)
DIY fix possible
Check your boiler's pressure gauge and ensure it is between 1.0 and 1.5 barIf the pressure is low, use the filling loop to top it up to the correct levelCheck that all your radiators are turned on and that the valves are fully open to allow water flow
Avoid the next call-out bill
A cover plan would handle faults like S.53: no call-out fees, no surprise bills.
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Related fault codes
All 61 fault codes on the EASICOM 3 25r
Seeing a different code? Every code this model can display, in one place.
Related guides you might find useful
Hot water works but heating does not
On a combi it is usually the diverter valve. On a system boiler, the motorised valve.
Read →What pressure should my boiler be?
1 to 1.5 bar when cold on most UK boilers, from the manuals.
Read →No hot water but heating works
Almost always a stuck diverter valve on a combi.
Read →