What is wrong if you have a digital thermostat in your house with zoned heat and air and the heat and air work fine on the thermostat upstairs but there is no heat on the downstairs?

Answer

There is either a problem with the downstairs thermostat, or the wiring from that thermostat to the unit. First check the batteries in the thermostat. Yes the digital ones have batteries. :-) Next, if that doesn;t fix it, try switching your two thermostats. Be careful to wire them exactly as they were before. If your heat now works downstairs and not upstairs, replace the thermostat. If the problem remains unchanged and you still have heat up and not down - check your thermostat wiring. The voltage is low so a simple voltmeter can be used to confirm continuity from the end where it goes into the furnace to the end where it connects to the thermostat. If the wire checks out and the problem is not the thermostat, then call a licnesed professinal - youhave bigger problems.

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