Keeping things nice and simple to start with, have you tried removing the wire link where a room thermostat can be connected?
Section 2.10 photograph 6.
Section 2.10 photograph 6.
Ariston eurocombi mffi a23, CH on all time
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Are the diverter valve microswitch contacts accessible? Just to make sure it is switching and not stuck in one mode.
If they slide off you could try disconnecting them or it might be easier to disconnect at the PCB end.
If they slide off you could try disconnecting them or it might be easier to disconnect at the PCB end.
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