BoilerFaultCodesWhat the manual says
Manufacturer manualAppliance is within the waiting period of the operation block function due to water shortage (temperature gradient)
DIY fix possible
Check the pressure gauge on the front of the boiler; if it is below 1 bar, locate the filling loop.Open the filling loop valves to increase the system pressure to between 1 and 1.5 bar.Close the valves tightly and check the boiler display to see if the error clears.
Avoid the next call-out bill
A cover plan would handle faults like S.54: no call-out fees, no surprise bills.
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Related guides you might find useful
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1 to 1.5 bar when cold on most UK boilers, from the manuals.
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On a combi it is usually the diverter valve. On a system boiler, the motorised valve.
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