H6
Rheem
Indoor Fan or Indoor Unit Communication Fault
Rheem multi‑zone system displays H6 and one or more indoor units do not respond or show communication errors.
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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 indoor fan motor on one zone, Open communication wiring to a specific indoor unit, Incorrect indoor address or wiring, Faulty indoor PCB
How to Fix / Troubleshooting
Safety first: Turn off power to the entire multi‑zone system.
- Identify affected zone: Determine which indoor unit(s) are not operating or showing error.
- Check fan motor: On the affected unit, inspect and test the indoor fan motor as for E8 faults.
- Verify wiring: Confirm that the communication and power wiring from the outdoor unit to each indoor unit is correctly landed and secure.
- Swap test (advanced): A technician may temporarily swap indoor PCBs between zones to see if the fault follows the board.
Warning: Multi‑zone communication issues can be complex; improper wiring changes can affect all zones.
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Repair Difficulty
Hard
4/5
Required Part
Rheem Indoor Fan Motor / Indoor Unit Control Board
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