Question about Heating & Cooling
Remove the thermostat face and place a jumper between R and Y. The outside unit should come on. If it doesn't, check for 24vac between R and C or R and Y. If you don't have it then you need to check the transformer. Check for 24vac on the transformer secondary and 120vac on the transformer primary. If you don't have power on the primary, check for a blown fuse or tripped breaker. If you do have power on the primary but nothing on the secondary, you need a new transformer. If the unit does come then the thermostat is the problem.
If the transformer is good and the unit doesn't start when you install the jumper then you have a problem in the outside unit. It could be the contactor coil which you can check with an ohmmeter. It could also be a low or high pressure switch or and overload all of which you can also check with an ohmmeter. Let me know what you find.
Posted on Nov 08, 2010
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Posted on Jan 02, 2017
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