A few weeks ago we woke to find the heating on (gas with Vaillant EcoTec boiler in garage). The weather was very mild.
Plumber came and said it was likely the 3 port valve in the airing cupboard. Changed it but made no difference. Also changed the drayton timer unit - also made no difference.
Went to garage and took cover off the Honeywell froststat. Said it was all bashed up inside (not sure how and I did not see it - frosstat is over 20 years old). Anyway he put all the wiring back together and said it would be fine. Anyway 3 weeks on we woke up to the heating on again.
Happy to replace froststat if confident it will solve problem.
Thought much appreciated.
Plumber came and said it was likely the 3 port valve in the airing cupboard. Changed it but made no difference. Also changed the drayton timer unit - also made no difference.
Went to garage and took cover off the Honeywell froststat. Said it was all bashed up inside (not sure how and I did not see it - frosstat is over 20 years old). Anyway he put all the wiring back together and said it would be fine. Anyway 3 weeks on we woke up to the heating on again.
Happy to replace froststat if confident it will solve problem.
Thought much appreciated.