E6
Rheem Compressor Low-Speed / IPM Drive Fault

Rheem ductless system displays E6 and may run only briefly or not at all; sometimes accompanied by unusual compressor noise.

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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

Failed inverter IPM (Intelligent Power Module) on outdoor PCB, Loose compressor harness connections, Internal compressor electrical fault, Overheating of inverter heat sink

How to Fix / Troubleshooting

Safety first: Inverter circuits carry dangerous voltages. Turn OFF all power and wait several minutes for capacitors to discharge before touching the board.

  • Inspect connections: Remove the outdoor panel and check the multi-pin connector from the inverter board to the compressor. Ensure it is fully seated and free of corrosion or burn marks.
  • Check heat sink and fan: Confirm that the outdoor fan operates and that the inverter heat sink is not clogged with debris. Clean gently with a soft brush if needed.
  • Look for board damage: Examine the inverter section for cracked components, burn marks, or bulging capacitors. Visible damage usually means the board must be replaced.
  • Do not attempt DIY board repair: Inverter boards are not user-serviceable. If E6 persists after checking connections and airflow, schedule a professional service call.

Warning: Never touch the inverter board when powered. Residual charge can remain even after power is removed.

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Repair Difficulty

Professional Required 5/5

Required Part

Rheem Outdoor Inverter Control Board (IPM Module)
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