Error code · Range

Frigidaire Microwave Combination F43: Cooling Fan Running Slow

Medium · inspection needed

Code: F43
Appliance: Range
Brand: Frigidaire
Warranty: 30-day workmanship

What F43 means

On Frigidaire range and wall-oven combinations that include a microwave, F43 means the microwave external cooling fan is turning abnormally slowly. The fan keeps the microwave section from overheating, so the control watches its speed and shows F43 when it drops. You may find the microwave will not start, shuts off early, or the display shows F43 along with a fan that sounds weak or is hard to hear.

Common causes of F43

The microwave cooling fan motor, which can slow down with age
Dust or grease binding the fan
The wiring to the fan
The control reading the fan speed

✓ One safe check you can try

1. Turn the microwave off and give it time to cool. 2. Check that the vents around the microwave are not blocked. 3. Unplug the unit or trip its breaker for up to 30 seconds, then give it power again. 4. Leave the microwave housing closed.

! Why to stop there

F43 says the fan is slow, not why, so we check whether it is dirty, worn or being misread.
We test the fan's speed, its supply, and the wiring.
You get a written price before any part is replaced, and an honest word if an older unit is not worth it.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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F43F43 questions

Is it safe to use the microwave with F43?

We would not. The fan protects the unit from heat, and the control stops it for that reason. Let it cool down and call us so we can find out why the fan is slow.

What makes the fan slow down?

Wear, dust and grease are common. A wiring problem can do it as well. We check each of them before we replace the fan, so you are not paying for a part you did not need.

What would F44 tell me instead?

They are opposites. F43 is a fan that is too slow, and F44 is a fan that is too fast. We test both the same way, starting with the fan and its wiring.

Book a visit

Still seeing F43?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 844-8518