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Well, having observed that the problem was much worse (almost 100%) first thing in the morning, I developed a theory. And having tested the theory three days in a row, I have solidified a conclusion, which is that the receiver won't work if it's too cold. Which means, as you'll have realised if...

Interesting :D Unfortunately (or fortunately) it's decided to start responding again today - if it acts up again I'll try that. I think it's unlikely I'll be able to pull it out fast enough thought, mostly it's only a second before it clicks off again.

That's the one - I'd looked at the manual but hadn't actually spotted the number thank you! Don't tend to expect big brands to make themselves available by phone these days :) I'll give them a try. Changing the temp doesn't help - as I say, the controller/transmitter seems to be working fine...

I...really can't afford one, mate. What an enormously helpful response on a DIY forum "Just buy a new one". Cheers.

Well, the problem's gotten steadily worse and today I've cycled it a dozen times and it does the same thing - goes on then immediately off again. I have changed the channel on the transmitter and receiver, and brought the transmitter right up close to the receiver; neither works. I think it's...

Well, before I posted the above I power cycled the boiler, the thermostat, replaced the batteries and tested about a half dozen times and it kept happening...but after posting it I went downstairs and two minutes later the boiler came on just fine :D No idea what caused it or what resolved it...

I have a Baxi 124 combi boiler with a Flomasta RF thermostat fitted. The boiler is still working fine for hot water, but when the thermostat signals for central heating the green light on the receiver shows but then immediately goes off again (twice, before apparently giving up). Is there...