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 the system pressure gauge on the front of the boiler; ensure it is between 1.0 and 1.5 barIf the pressure is below 1.0 bar, use the filling loop to top up the system until it reaches the correct rangeCheck all radiators to ensure they are bled of any trapped airEnsure all radiator valves are fully open
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 79 fault codes on the Energy7 Regular
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.
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