Lennox Air Conditioner Error Code E437
Heat sink temperature sensor fault has occurred - temperature less than 4°F or greater than 264°F after 10 minutes of operation (inverter code 65).
SourceLennox Air Conditioner - Service Manual: Elite Series XC20p. 34
The full E437 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.
SourceLennox Air Conditioner - Service Manual: Elite Series XC20p. 34
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Where this code is documented
2 manuals in the MyPros+ library document this code for Lennox air conditioner.
Models covered by the manuals that document this code
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