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Error code reference
Frigidaire Air Conditioner Error Code F4
Outdoor ambient temperature sensor is open or short-circuited.
SourceFrigidaire PTAC - Service Manual: FRP77/90/12 SeriesSection 9, page 39
Diagnostic procedure
The full F4 procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check if the wiring terminal between outdoor ambient temperature sensor and controller is loosened or poorly contacted.
SourceFrigidaire PTAC - Service Manual: FRP77/90/12 SeriesSection 9, page 39
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented
2 manuals in the MyPros+ library document this code for Frigidaire air conditioner.
Models covered by the manuals that document this code
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