Question about Honeywell Programmable Thermostat Heater
In some thermostats it is required that you have a common lead hooked to Thermostat and back too the transformer in the air handler unit the batteries are used as a back up in the event the power goes out too keep your program in thermostat. if the common lead is not attached your thermostat is being powered by the batteries only and not the system control power, and will drain batteries fast.
Posted on Sep 16, 2010
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Posted on Jan 02, 2017
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