The heat was not coming on per my wife. Propane Crown Boiler (18 years old), Taco ZVC404(4 zone but I only use two, two story cape house) 1st floor thermostat calling for heat, but the only light on is the power light on the ZVC. So I turn breaker to furnace off, turn down thermostat on first floor, turn second floor thermostat up, and turn furnace breaker back on. Now have everything working, both zones.
What happened? What is going to go wrong when it is -20 degees?
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