Have HVAC Questions? Ask an HVAC Expert for Answers
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Yes the thermostat batteries could be low or the thermostat may be bad, have you checked the batteries?
Ok can you get at the wires to the thermostat? If so touch the Red wire to the White wire and see if it starts to heat, if so bad thermostat.
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OK if it does not kick on then you have an issue with the unit or the thermostat wiring from that thermostat to the unit itself.
Yes this could be a zone control issue as well. I would try one thing though before calling, shut the power down to the whole system for a full 5 minutes to reset everything and then try it again. Sometimes that will clear up that issue.
Yes correct the main power switch to the unit.