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The fan and pcb replacements were to fix previous problems, not the one I have now. Any advice would be still be appreciated.

Hello there, can anyone help? My boiler works fine when CH or HW, or both are selected, but as soon as they are both switched off via the timer, the boiler hunts, fan switching on and off again every couple of seconds continually, and therefore the boiler does not fire up. I have replaced the...