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Hi Chris, To be clear the heating occasionally keeps running without turning off! The house just gets hotter and hotter! I hope that clears any confusion! On the Honeywell, I have seen a clip on the right that can slide out to the right. It looks like there should be a watch battery of...

Hi All, I have a Vaillant boiler. Its managed/controlled by a Honeywell CM67 unit. I have a set program for the heating to come on/off, and the tempratures that it should regulate at the programmed times. Over the last 2 weeks occassionally the boiler keeps running and the heating doesn't...