BoilerFaultCodesWhat the manual says
Manufacturer manualHotwaterhandlingmode:Requirement
What causes this fault?
This code appears when a hot water tap is opened or a shower is turned on, triggering the boiler's internal sensors to detect a flow of water. It signifies that the internal diverter valve has successfully shifted into position to prioritise heating your water. It is a normal part of the boiler's operation and simply confirms the system is responding to your request for heat.
DIY fix possible
No action is required as this is a normal status message and not a fault.Ensure your hot water taps are closed if you do not require water.Check your external controls or timer if the message stays on when no water is being used.
Avoid the next call-out bill
A cover plan would handle faults like S.20: no call-out fees, no surprise bills.
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