What the manual says
Manufacturer manualCommunication error between printed circuit board (PCB) and control. Temporary error, will self reset.
From this model's manual
This code was read directly from the manufacturer service manual for this model.
DIY fix possible
Wait for the boiler to self-reset as this is often a temporary glitchSwitch the boiler off at the fused spur switch for 30 seconds and turn it back onEnsure no external controls or thermostats are being adjusted rapidly
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