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Ariston eurocombi mffi a23, CH on all time

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.
 
Wow you are testing me. i had to take the back of the pcb off but found the ext therm/timer link. I disconnected it but this has had no effect when i restarted the boiler..
 
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.
 
Jackthom< thanks for that hint,,, sorry for delay in reply, the micro switch was faulty, all working perfect now,, Thanks guys
 

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