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Hello, the relay/ contactor coils will be located in tje control panel of the outside unit. You can follow the the wires from the disconect box into the unit, it will lead directly into the relay/ contactor. When both the fan and compressor run nonstop even when thermostat is satisfied the the contactor is welded and must be replaced.
Hello, it could very well be a leak, if the air filter, evap coil, and airflow all seem ok then i would suspect a leak. Depending on where it leaks will depend on how much it will cost, if it is just a leaky schreader valve core then the core is just replaced and freon is added to the proper level. This would be somwere in the 100-150 dollar range. However, if it is a leak somwhere in tne lineset or in the evap coil then the leak must be repiared, a vacuum pulled on tje unit, nitrogen added, and finnally freon chraged back in, this would be closer to 400 dollar range. I hope this helps
Hello, if the outside unit is not running check tje power supply to make sure you are getting 240 volts, also make sure the contactor coil is receiving 24 volts, if you are not getting 24 volts at the contactor then it may be a bad thermostat, control board or the thermostat wiring is loose or perhaps cut somwhere. If you have 24 volts at the contactor and does not energize than replace the contactor coil.
It starts knocking because the engine is getting hot. If you have an electric fan, check to see if it is working. If it is working, replace the thermostat. Last check to see if you have water in your oil Tje oil will be a milky color. If it is you need to have the head gasket replaced. I hope this helps you.