E7
Keystone
Mode Control or Fan Motor Feedback Error
Keystone air conditioner shows E7 and may not operate in certain modes or may shut down unexpectedly.
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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.
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Possible Causes
Faulty indoor fan motor feedback (for DC motors), failed mode control relay on PCB, wiring harness issue between fan and board, defective main control board
How to Fix / Troubleshooting
Safety: Disconnect power. Moving fan blades and live terminals can cause injury or shock.
Steps:
- Check fan operation: With the grille removed, spin the indoor fan wheel by hand. It should rotate freely without binding or scraping.
- Inspect wiring: Trace the fan motor wires to the control board. Look for loose connectors, burnt plugs, or damaged insulation. Reseat all connectors.
- Test motor (if AC type): Measure motor winding resistance and compare to service specs. An open winding indicates a bad motor.
- Check DC fan feedback (if applicable): Some Keystone models use DC motors with feedback wires. Ensure all wires are intact and properly seated.
- Board inspection: Look for burnt or cracked solder joints at the fan relay or driver circuit on the main PCB.
- Replace parts: If the motor is seized or windings are open, replace the indoor fan motor assembly. If the motor tests good but E7 persists, replace the main control board.
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Repair Difficulty
Hard
4/5
Required Part
Indoor Fan Motor Assembly
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