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Jessica HarrisAug 27, 2025
How to troubleshoot E3 error on AUX Air Conditioner?
- RRichard AtkinsAug 27, 2025
If your AUX Air Conditioner displays error code E3, it indicates an indoor unit coil sensor error. This is detected as a short circuit or open circuit during the inspection of the indoor unit's main PCB. Check whether there’s resistance problem, short circuit or open circuit in the sensor; the resistance value shall with a reasonable range (about 20K? for frequency conversion machine).




