Recent content by chrisroffey

So why did it work with the old stat but not with the other 3 I have tried. I haven't changed any wiring in the programmer. Thats whats baffling me! Thanks for your help on this. I'm going to try and get my hands on a multi meter at work tomorrow.

The stat also displays the flame and clicks when turned up evne when the boiler is set to off on the programmer. Am I right in thinking that if the boiler is on constant it will run as long as the room temp is lower than the temp set on the stat and it will go off when it rises above it. So if...

No, the boiler keeps running. The flame on the display comes on and off when it is turned on and off or up and down and you can hear the click in the stat when you turn the temp past the room temp.

This was the old one

Boiler comes on and off with the timer switch but if I put the programmer to constant and then turn the thermostat on and off or up and down it has no effect on the boiler. It just keeps going.

I'm not really clued up on all that stuff and dont have the gear. It was just that the old thermostat had seen better days and thought I'd change it when we redecorated. I assumed it would be a straight swap. I first bought a digital one that didnt work, then I swapped it for a Honeywell...

Red in A and Black in B.

Hi, I'm trying to fit a new thermostat but it wont work. This is the third one I've tried but they either work at random or as this latest one is doing the heating constantly stays on even when it's turned down to the minimum temp. It is a Honeywell DT90e thermostat with a Potterton EP4001...