Compressor won't start

Old 07-27-15, 07:19 PM
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Compressor won't start


Quick run down of whats going on. In the past couple weeks when the Thermostat tells the Compressor and fan to kick on the fan kicks on only then about 4-5 minutes later the compressor kicks on. Well yesterday the fan kicked on and the compress never turned on. I figured the capacitor needed to be replaced so I replaced it. I am getting the same result after the replaced capacitor of a no start for the compressor. Twice, I have sprayed down the coil and the compressor with the water hose and both times have resulted in getting the compressor to run and start cooling. My HVAC knowledge is very limited however I have a theory that possibly the thermal protector switch is not allowing the compressor to start, that's why it started after being hosed down.
Once it is running it will not stop until the desired temperature is acquired. It is the starting of the compressor that is giving me issues

Another reason I think this is the issue is because during the night the compressor runs fine hence the sun is down and less heat on the unit?

Now I could be completely wrong but this is my theory.

Any other input would be appreciated.
Old 07-27-15, 07:28 PM
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Welcome to the forums.

The compressor has an internal thermal overload switch. When the compressor gets too hot the overload will shut down the compressor. It can take an hour or better for the compressor to cool and the overload to reset.

Starting the system and having the fan come on could cool the compressor enough for it to restart. Hosing down the compressor will definitely reset the overload quickly.

Why is the compressor going into thermal overload ?
It could be the fins in the condensor are plugged cutting down on needed airflow.
It could be the fan is not running up to speed or slows down during operation.

At night it's cooler..... the system doesn't have the same amount of hot ambient air to contend with.

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