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Hoping someone on the board can help me with this issue - to which I am sure the answer is staring me in the face... Problem Our heating and hot water work absolutely fine on their schedule or manual boost, but... When the temperature drops each night it triggers the frost stat and causes our...

Hi, this is my first post, so all help will be very greatfully received. I have an Ideal Elan 2 RS230 boiler and Honeywell ST699 control set. All installed when my house was built in the early 90's. Problem The boiler will not fire the main burner when the heating or water is supposed...