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Thanks, I'll check the wiring tonight. I'd like to clarify my problem further. When the thermostat is turned on, the zone valve open (watching the mechanism) and i hear a click sound but the furnace doesn't fire. The problem persist even after I changed the motor assembly on the zone valve...

Thanks for the response. Could you please elaborate on your suggestion? I don't know much about heating systems.

I've a 3-zone gas heating system (baseboard). Since last week, there has been no heating on the ground floor whereas the first floor is heating well (the basement heating was not on but it's not working either). There is one circulator pump and three zone valves. I tried switching the...