Question about Heating & Cooling
I couldn't have explained it better Darius. Good job
Posted on Mar 30, 2019
Is this an outdoor unit or indoor? the most common cause is a stuck compressor contactor - located in the outdoor unit.
The contacts tend to get pitted-up. Eventually they can weld shut. This can cause serious damage to the system. It is good practice to replace the contactor every few years or when pitted, just like spark plugs in a car.
Another cause would be a shorted thermostat cable. This can be caused by a weed-eater hitting the wire outside, or a wire-staple digging into the wire too tightly, rodents chewing on it, or just bad wire.
The thermostat itself could be bad, sending a signal to the outdoor unit when it isn't supposed to.
Posted on Mar 30, 2019
I'm leaning toward sticky relay as well, but if you want to confirm it's not thermostat, remove thermostat from wall, and temporarily disconnect the yellow wire from thermostat (compressor) when/if, it happens again. If compressor stays running, I'd say relay for sure.
Just for future reference , Gray wire from thermostat is low fan, green wire is high fan, yellow is compressor, blue is ground. ( For cooling side) The red is 12 v + to furnace and white is negative to furnace.(heat side)
Posted on Jun 25, 2010
Testimonial: "Many thanks. After cool night with breaker off the compressor unit worked fine the next morning, then stuck again on in the p.m. Next day same thing. Three days later all is now working well. Must have been a welded contact that somehow cleared itself. Thanx again!"
I feel it is a faulty thermostat switch that is causing the problem. If you replace it, your problem may get solved. The fan switch has nothing to do with the compressor. It is the thermostat that has all to do with it. Fan is only to blow the air fast or slow. The thermostat switch controls the working of the compressor.
Posted on Sep 25, 2010
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