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No, you can't. By fitting an external stat in place of the original short link on the boiler connection block, you have introduced a second switch, and both need to be 'on' to get CH. This is why the integral clock should be left on constant all the time, because if it switches off you'll get no...

Sorry you've had a nightmare so far - doesn't help the confidence! Don't know about your boiler specifically, but am guessing it will be wired the same, being a Main. When integral clock is set to constant, you can do what you like with the pips - they will be ignored. I've set mine all to 'off'...

Hi Simon I'm not a professional, but I installed a Honeywell programmable thermostat only yesterday evening! I have a similar setup to yours, with a combi boiler in the kitchen and TRV's on radiators. Your first 5 queries need to be answered by those with much more knowledge, but here's...

If anyone else is wondering about wireless programmable thermostats, I am extremely pleased with this one. It was a doddle to install, took about 20 mins. It comes with a default 7-day setup with 6 periods per day, which will get you started, and all aspects of the programming are very easy to...

Brilliant! Thank you :)

Hi all My first post, so please be gentle! I have a Main Combi 24 HE boiler with integral CH timer, and want to replace the timer with a programmable thermostat. The one I prefer is the Honeywell Homexpert THR872CUK Wireless Programmable Thermostat. Is this possible? It looks as though...