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St 9400c keeps cutting out and turning on rapidly boiler will not heat properly

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Rapidly? seconds or minutes.
Make sure you select hot water boiler in the thermostat setup. That can cause short cycling. Boiler need a longer cycle range. If not, remove stat and jump wires, Isolate the problem, is it stat or boiler?

Posted on Sep 24, 2014

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Posted on Jan 02, 2017

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