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Air conditioner works but won't cool?

If your outdoor and indoor units are BOTH RUNNING, BUT NOT COOLING, make sure that all windows and doors are closed, your supply and return vents are open - not blocked, and that your air filter is clean. If no problems there, then you should probably turn the air conditioning off and schedule a service call. Below is a list of possible causes:

  • Low refrigerant charge;
  • Refrigerant flow-related problem - restriction;
  • Faulty metering device;
  • Poor efficiency- needs cleaning and servicing;
  • Bad reversing valve;
  • Bad compressor valves;
  • Duct leak in unconditioned space.

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