BoilerFaultCodesWhat the manual says
Manufacturer manualHotwaterhandlingmode:Temporaryshutdownoftheburner
What causes this fault?
This occurs when your boiler successfully heats the water in the plate heat exchanger to the set temperature and temporarily switches off the burner to prevent waste. It is a normal part of the boiler's operation, indicating that the system is simply waiting for the water temperature to drop slightly before firing up again to maintain a steady flow. This prevents the unit from overheating and ensures a consistent temperature at your taps.
This code may be more noticeable in summer when the incoming mains water is naturally warmer, meaning the boiler reaches its target temperature much faster than in winter.
DIY fix possible
Check that your hot water taps are fully closedWait for 5 to 10 minutes for the 'S' status code to clear automaticallyMonitor the boiler to see if it moves into a heating or standby state
Avoid the next call-out bill
A cover plan would handle faults like S.28: no call-out fees, no surprise bills.
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