Posted by showcrop on November 11, 2019 at 13:07:57 from (75.68.37.174):
My home heating boiler has been having a problem this fall. I installed it five years ago and it has been working just fine until recently. The boiler has a Honeywell control with a Becket burner and three Taco zone control valves and two programmable T'stats and one twist knob control t'stat for the Boilermate. There are three zones, two work as they always have. When heat is called for the circulator pump comes on and runs for around 90 seconds, then the boiler fan comes on for around 30 seconds, then the burner fires up. There are three zones, two of them work as I described. The third zone, controlled by a programmable T'stat keeps ending and then restarting the process. It will stop wherever it is in the start-up process, and then restart it. it will shutoff when in circulator only mode, and it will shutoff while in burner fan mode and it will shutoff after it has fired up. This will go on for approx. 10 minutes before it finally keeps running. The fact that two zones work as they should eliminates a problem with the boiler control or burner. I replaced the T-stat but it made no difference. I have gone over the control wiring very carefully. There is no moisture at the zone valve. There are three zones two work as they should. Any ideas?
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