GE air conditioner shows ES and may not maintain set temperature

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Any of the thermistors (room, evaporator, outdoor) open or shorted, Sensor harness damage, Connector loose at control board, Main control board sensor circuit failure

How to Fix / Troubleshooting

Safety: Disconnect power.

Steps:

Identify sensors: Locate the room, evaporator, and outdoor thermistors as applicable to your model.
Inspect wiring: Check each sensor’s wiring for damage and ensure connectors are fully seated on the control board.
Test sensors: One by one, disconnect and measure resistance, comparing to GE’s temperature-resistance chart. Replace any sensor that is open, shorted, or far out of range.
Board replacement: If all sensors test correctly and ES remains, replace the main control board.

Repair Difficulty

Hard 4/5

Required Part

Temperature Sensor Set (Thermistors)

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