What the manual says
Manufacturer manualThe boiler is waiting in response to a heat demand – the boiler regularly switches to partial load
Shared across the range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
DIY fix possible
Check that all radiator valves are fully open to allow heat to circulateEnsure the room thermostat is set high enough to call for heatWait to see if the code clears automatically as the system cools
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