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Amazingly I had the same problem but would never have noticed the corrosion on those connectors (just one in my case) unless you had suggested this. I now have perfect thermostat operation! Thanks for your eagle eyes in spotting that and for posting!

brilliant, thanks [/url]

Thanks for this, I will try that now, sounds like a connection might be the problem as it works sometimes and not others... Many thanks.

Hi there, Interested to see this discussion, I am having exactly the same problem... My thermostat has been working perfectly since it was installed 5 years ago, a couple of months ago battery signal flashing so replaced those and worked well again now suddenly the last few days not doing...