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Blecher_onthe_Hudson OP t1_j26i1i3 wrote on December 30, 2022 at 12:27 AM

Reply to comment by cassiedanger in Did your heating fail to keep your temp up last weekend when it was below 10 deg? by Blecher_onthe_Hudson

That's bizarre, it's not that complicated! Thermostat closes a 24v switch and the relay in the boiler turns the pump on, opens and it goes off. If it's not the thermostat its the relay.