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Old 09-09-2021, 10:58 PM   #1
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Question AC up front (living area)

Had a quick question before the HVAC tech shows up tomorrow , if AC unit starts throwing cold air then after been on for a few minutes blows hot air what are the symptoms that cause this? Don't know much about HVAC , i did watch a couple of YouTube videos but nothing directly to this issue or i missed something at some point in the videos i watched.

Would like to just know a little when tech shows up TIA
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Old 09-10-2021, 07:23 AM   #2
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Very likely either a wiring issue or bad run capacitor for the compressor. Or something as simple as how you have the thermostat set.

The fact that it blows air, cold or hot, tells you nothing wrong with the fan and refrigerant charge - if the coil was freezing up, then you wouldn’t have air flow. IF HE TRIES TO PUT GAUGES ON IT, SEND HIM WALKING!

The “Auto-On” switch on the thermostat should be set to Auto. That allows the fan to cycle with the compressor. IF it is set to “On”, and the thermostat was satisfied with the temperature, then non-refrigerated air would be discharged from the vents because the thermostat turns the compressor off.
Some people don’t like the cycling of the fan so they set Auto-On to On.

Run capacitors are cheap, although their failure is hard on the compressor.

If you haven’t cleaned the condenser, that needs to be done as well. A dirty condenser causes the compressor to run hotter which causes the thermal overload to trip.

And finally, you might want to check your voltage with the problem unit running - in fact, with all normally running high load devices running. You may have a low voltage problem that is causing issues that the one unit may be a little more sensitive to.
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Old 09-10-2021, 07:30 AM   #3
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Quote:
Originally Posted by RayAZ View Post
Had a quick question before the HVAC tech shows up tomorrow , if AC unit starts throwing cold air then after been on for a few minutes blows hot air what are the symptoms that cause this? Don't know much about HVAC , i did watch a couple of YouTube videos but nothing directly to this issue or i missed something at some point in the videos i watched.

Would like to just know a little when tech shows up TIA
Heat Pump, I assume? The reversing valve coil could be going bad or a connection to it. Thermostat could also do that. Do you have the 4 or 5 button thermostat?
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Old 09-10-2021, 08:10 AM   #4
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Thank you so much for that MrMark52

5 button thermostat
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