Question about Honeywell Programmable Thermostat Heater
Sounds as though another problem is showing up. Verify T-stat is sending the red 24volts (alt current) through the White wire. This can be done at the t-stat or the furnace whichever is easier to access. At t-stat your meter will show 24volts from red to any wire that the t-stat is not jumping to. So if you put on lead on Red and other on White and 24 shows up the t-stat is not connecting that and the furnace will (NOT) turn on heat. If you get 24 on Y or G but nothing on White then the t-stat is (Good) and the furnace in not kicking on.
To diagnose furnace look for flashing light on board. count flashes and read furnace diagram for info. Furnace diagnosis will take some patience and observation of what happens when. Problems can be Airflow, or parts. It takes some watching. I've found tools jammed in vent stacks, blocked (dirty) evaporators and failing sensors or relays. All causing the units to start but not stay lit.
Posted on Feb 14, 2011
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Posted on Jan 02, 2017
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