Boiler will only start from one zone.
#1
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Join Date: Mar 2020
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Boiler will only start from one zone.
Hi all, I have a Weil Mc Lain forced hot water oil fired boiler. Two zones. One zone working fine. Lowered the tstat for that zone so not to kick on. Turned the tstat up on zone two. Boiler will not fire up. two separate circulators. Purged both zones. New tstat. Not sure if there's a way to by-pass the tstat or if that would even help.I have searched all I can with no luck find this exact issue. Has to be something simple I'm missing or atleast I hope.
#4
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sometimes relays get stuck. I would keep and eye on it going forward just to make sure it isn't on its way out..
Alternatively, sometimes techs wire up second zones incorrectly. When I bought my house, i found one zone worked properly (it was wired directly to the aquastat). The other three zones were wired offer of two different honeywell relays to run their circs but they were not wired to fire the boiler at all (so it would only deliver water based on the boiler lo temp setting). The techs solution was turn the lo temp up to 175; pretty big waste.
Glad its working for you now.
Alternatively, sometimes techs wire up second zones incorrectly. When I bought my house, i found one zone worked properly (it was wired directly to the aquastat). The other three zones were wired offer of two different honeywell relays to run their circs but they were not wired to fire the boiler at all (so it would only deliver water based on the boiler lo temp setting). The techs solution was turn the lo temp up to 175; pretty big waste.
Glad its working for you now.