How to Repair Your Window Air Conditioning Unit

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Rachel Polant

Feb 6

Window air conditioning unit repairs: DIY or let someone else try?

Window air conditioning units are a popular way to beat the heat because they are inexpensive, portable, and pretty much fuss-free. But, sometimes our window AC units let us down and won’t keep us cool.

Window air conditioning unit repair can be broken down into two basic problems: it doesn’t cool adequately or it won’t turn on.

Sometimes it’s a problem with the window air conditioning unit’s refrigerant being low, and a simple recharge performed by a qualified HVAC contractor will do. But, most often it’s due to a dirty filter impeding the airflow and proper functioning of the unit. Luckily, this means the window air conditioning unit doesn’t need repairs at all — just a good, thorough cleaning by the homeowner.

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Troubleshooting Your Window AC Repairs

First, before you attempt any window air conditioner unit repair on your own, you should refer to the owner’s manual and decide if it’s something within your skill-set that you feel comfortable tackling. If not, you can always hire an HVAC professional who is knowledgeable in window unit repairs.

If you do feel up to repairing your own window air conditioner, these are the steps you need to take with this simple how-to guide to troubleshooting your window AC unit’s repairs:

What to do if your window AC unit won’t cool sufficiently

  1. Unplug the AC unit and remove it from the window or wall. Be careful and get help from another person. They are bulky and heavy. Move the air conditioner to a place where you can work on it, like a covered outdoor space or a garage.
  2. Remove the grille and filter. Then unscrew the metal case. You should be careful not to damage the coil’s fins.
  3. Clean or replace the filter. Most models of window A/C units have filters readily available in the appliance section of stores.
  4. Clean the fins of the coil using a vacuum that has a soft brush attachment.
  5. From the fan side, spray water through the back of the fins, protecting the wires and motor with plastic.
  6. Give the unit a thorough cleaning with a damp rag. Make sure all of the drains that allow condensed water to drip away from the window unit are not clogged and are open. Allow the unit to dry.
  7. Lubricate the motor according to your owner’s manual specifications while you have the window air conditioning unit apart.
  8. You’re done! Just reassemble and reinstall the unit. Ask for help hoisting and stabilizing the unit while getting it in place.

What to do if your window unit won’t turn on

  1. It seems obvious, but we all have our moments: make sure the window unit is plugged in and turned on.
  2. Make sure the outlet it’s plugged into works. Plug it into a different outlet to double check.
  3. Check the circuit breaker and fuses if the light doesn’t go on. It might have tripped the breaker or blown a fuse. You may need to reset the breaker or reset the fuse.
  4. If the light is on but the unit is still not blowing out air, then the A/C’s switch may be faulty or the thermostat needs to be repaired.
  5. Make sure your thermostat settings are correct and are set below the room’s temperature.
  6. If none of these solve the problem and your window unit still will not turn on, it is time to call an HVAC repair contractor who works on window air conditioning unit repairs.

If you have a window air conditioning unit that isn’t working at its peak performance level, keeping your cool, has highly qualified HVAC contractor who can perform those repairs for you.

Or, perhaps, you’d like to upgrade your HVAC system from a single-room window unit to a central cooling system, we have HVAC pros who specialize in that as well. Get a free HVAC quote for your repairs or installations today!