Originally posted by MarillionFan
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To prove this - if you put the timer onto hot water- does the boiler fire and deliver hot water (don't know if its a combi or not - do you store hot water in a cylinder?)
If it does then it's definitely(ish) the room stat- outside chance that it could be a stuck three way valve depending on your system design
One way to prove for sure would be to bridge and therefore bypass the wires on the room stat - but that would need a meter and a comfort zone of messing with cables (if you do this always write down what colour cables go where so you can get back to original state
HTH
also very curious about why you need batteries in a room stat (unless its a wireless jobbie)
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