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Bit of a novice about these systems - going back to the motorised valve - was wondering if the CH valve got stuck, could it be that the Rayburn is effectively trying to heat the HW but instead CH is getting the heat. Symptom of that presumably would be that boiler would keep firing up as HW tank...

Hello - back again with the same fault. The Rayburn has a Honeywell controller - replaced a previous Honeywell unit four years ago. I’ve just put a brand new one in but fault remains - controller set to ‘off’, no call for heat from room stat, but boiler is on and running the CH. as before it...

Thanks for the quick reply. My slightly panicked initial post probably not detailed enough. The Rayburn is behaving as it would if the stat was turned right up - ie. Firing up, running, shutting down (assume when temp threshold hit) and pump over run as normal. Then after a short period...

Hi - looking for some pointers. We have a Rayburn 480K with a Honeywell timer/control unit. Today the heating has been on non-stop - room stay is not calling for heat, and even with control unit setting to off the Rayburn is still firing up. I’m assuming a wiring issue - but grateful for any...