I have had a new boiler installed but kept the old controller as it worked fine. Now the heating keeps coming on at different times it is set to (3am in the morning is the worst when it is so hot!). Both the plumber and electrician can't understand it which hasn't helped me much!
When it randomly comes on there is no way of turning it off unless I turn the thermostat right down (even though every rad has a TVR).
Anyone any ideas, or do I need to replace the timer box - it is the Honeywell ST7100 which I am guessing is old?
Thanks.
When it randomly comes on there is no way of turning it off unless I turn the thermostat right down (even though every rad has a TVR).
Anyone any ideas, or do I need to replace the timer box - it is the Honeywell ST7100 which I am guessing is old?
Thanks.