E7
Rheem Indoor Unit Addressing / Mode Conflict Fault

Rheem multi‑zone mini‑split shows E7 and one or more indoor units will not operate.

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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

Duplicate indoor addresses on multi‑zone system, Incorrect dip switch or rotary address settings on indoor PCB, Incompatible operating modes requested by different zones, Communication bus conflict

How to Fix / Troubleshooting

Safety first: Turn off power to the entire multi‑zone system at the breaker and disconnect.

  • Check indoor addresses: Remove the covers on each indoor unit and locate the address dip switches or rotary selector on the control board. Verify that each indoor unit has a unique address per Rheem’s installation manual.
  • Correct mode conflicts: On heat pump multi‑zone systems, all zones may need to be in the same mode (cool or heat). Ensure no zone is calling for heat while another calls for cool.
  • Reset system: After correcting addresses and modes, power the system back on and allow several minutes for communication to re-establish.
  • Bus wiring check: Inspect the communication wiring daisy-chain between indoor units and the outdoor unit. Ensure correct polarity and tight connections.

Warning: Incorrect addressing can prevent the system from operating and may stress the control electronics. Refer to the exact Rheem model documentation for address settings.

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Repair Difficulty

Medium 3/5

Required Part

Rheem Indoor Unit Control Board (Address Settings)
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