Window Air Conditioner: Why does my window air conditioner's compressor hum but not work?
If you turn the window air conditioner off and then back on too quickly, the pressure of the refrigerant gas rises too high; as a result, the compressor hums and won't start until the refrigerant pressure equalizes between the evaporator and condenser coils. When you turn the air conditioner off, leave it off for several minutes before restarting it.
Other reasons the compressor is humming but not starting include a dirty or otherwise restricted condenser coil or the short cycling of the compressor.
THESE REPAIRS MAY HELP SOLVE YOUR WINDOW AIR CONDITIONER PROBLEM
Replace the window air conditioner compressor
The compressor is a pump that compresses the refrigerant-Freon-that's sealed in the window air conditioner. If the compressor doesn't run when activated, have a refrigerator service technician replace it; by law, an EPA-licensed technician must do this repair because it involves Freon.
Window air conditioner compressor
Symptoms for window air conditioners
Choose a symptom to see related window air conditioner repairs.
Main causes: clogged condensate drain, air conditioner not leveled properly, leaky window air seals …
Main causes: lack of electrical power, bad electronic control board, wiring failure, bad temperature sensor…
Main causes: bad compressor, lack of refrigerant, bad compressor start relay, electronic control board failure…
Main causes: clogged drain hole, air conditioner not leveled properly…
Main causes: turning the air conditioner off and the back on too quickly, dirty or restricted condenser coil, compressor…
Main causes: dirty air filter, air conditioner is too small for the room, temperature set too cold, control failure…
Repair guides for window air conditioners
These step-by-step repair guides will help you safely fix what’s broken on your window air conditioner.
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How to replace a window air conditioner electronic control board
The electronic control board is the brain of your window air conditioner. Here’s how to replace it.…
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