Hello,
I have a 19 YO Munchkin 199M gas boiler with 5 zones and 5 separate Lux 1500 thermostats. It was just serviced a few months ago. 4 of the zones are working just fine, but the 5th suddenly started heating up overnight, regardless of the thermostat set temperature. Turning the thermostat off didn't make any difference, nor did removing it from the wall.
I'm wondering if this points to the zone valve as the culprit? We have Taco Zone Sentry model #Za024Q41. Or, could it be an electrical problem else where? I'll probably hire someone to come and repair it, but I'd like to have a basic understanding of the problem before I do. Or, if it's really simple that would be helpful to know, too!
Thanks for any diagnostic or educational guidance you can give,
Erik in MA
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