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All sorted now folks. New thermostat is now working fine and a new programmer was fitted today....Just in time for the snow, thanks for all the feedback :D

Never thought of that, I just went for a basic digital thermostat. In hindsight it may have been wise to invest in a fully programmable one. I have booked a visit from my heating cover provider, hopefully they can resolve the remaining issue for me (with a free programmer :wink: )

[/url] Yes it would seem that the new thermostat is now doing its job correctly but even when the programmable timer is set to off the boiler is firing...Looks like a new programmer is my next purchase Regards Martin

Hello again, Short update....I managed to swing past B&Q today and pick up another thermostat which I have now wired up correctly (I think :D ). The thermostat now calls for heat when it drops past the set temperature and switches the boiler on and off as required...However the boiler still...

Hi John, On this set up with the new backplate fitted, the boiler will not fire with either the programmer set to on or off....And thanks for your continued feedback. Regards Martin

Further worrying development...Now even when my programmer is set for the heating to be constantly off and I have the old Satchwell TLX2259 re fitted, when it starts calling for heat, the boiler now fires up the heating even though it should not as I have effectively turned it off using the...

All the wires look like they are in good condition to me and I don't have any connector blocks at the moment to conduct the tests you suggest, I think that I would be a tad nervous about damaging my boiler as I am by no stretch of the imagination electrically trained. I just assumed when I...

3 amp fuse blew in fused switch for the central heating. How do I know if it's damaged? And which wire combination are we assuming is the correct one in case I buy a new one. Could be a costly experience if I keep guessing at it.

The boiler just remains awaiting a call for heat (orange light).

Hello again, I have now tried both of these wiring combinations and both resulted in the boiler firing even when the thermostat was not calling for heat...I even had a friend of a friend who is a spark look at it and he could not get it working properly, he said that the model may not be...

Thank you for the reply. I will give this a try tomorrow first thing.

Hi there members I am looking for a little help replacing an old Satchwell TLX2259 with a Timeguard TRT033. I thought it would be a straight swap but being a total novice I am finding it a tad tricky. Using a testing screwdriver I found that the yellow gave me a constant live, the red was live...