E7
Midea Mode Conflict / Indoor-Outdoor Mode Mismatch

Indoor unit displays E7; unit may not respond to mode changes or may run in wrong mode

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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

Incorrect wiring between multiple indoor units and one outdoor (multi-split), Control address conflict on indoor PCBs, Faulty indoor PCB mode control circuit, Incorrect DIP switch or address setting on indoor unit

How to Fix / Troubleshooting

Safety first: Turn off power to the entire system before adjusting wiring or DIP switches.

Steps to check (for multi-split systems):

  • 1. Confirm system type: Verify if your Midea system is a multi-split (one outdoor, multiple indoors). E7 is common when multiple indoor units request conflicting modes.
  • 2. Align operating modes: Try setting all indoor units to the same mode (all COOL or all HEAT) and similar temperature setpoints. Restart the system.
  • 3. Check wiring mapping: Ensure each indoor unit is wired to the correct terminal pair on the outdoor unit as per the installation manual. Miswiring can cause address conflicts.
  • 4. Address/DIP settings: For models with address switches, verify that each indoor unit has a unique address and that settings match the outdoor unit configuration.

When to call a technician: If E7 persists, a technician should verify communication addresses, update firmware if needed, and test indoor PCB mode control circuits.

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Repair Difficulty

Hard 4/5

Required Part

Indoor Main PCB
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