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Hello, my name is***** you tell me if the panel is lighting up when it does not work?
Thank you. From my experience it is usually a bad connection at the back of the unit. What I do is check for power there and see if it is present. If it is then the connector needs to be checked for any melting or loose connections. If those are fine then there is usually a short in the HVAC unit itself.
The most common cause of this that I have seen is a bad HVAC unit. These fail all of the time internally.