E11
Baxi Indoor–Outdoor Mismatch / Addressing Error (Multi-split systems)

Indoor unit shows E11; unit may run briefly then stop, often in heating 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 indoor unit address setting, Wrong combination of indoor units connected to outdoor, Communication address conflict on PCB, Incorrect wiring order between multiple indoor units and outdoor

How to Fix / Troubleshooting

Safety: Turn off power before adjusting any DIP switches or wiring.

Steps:

  • 1. Check installation manual: Refer to the Baxi multi-split installation guide for correct indoor address settings and allowed combinations.
  • 2. Verify DIP switch settings: On each indoor PCB, confirm the address DIP switches or rotary selectors are set to unique, correct values.
  • 3. Confirm wiring order: Ensure the communication cables from each indoor unit are connected to the correct terminals on the outdoor unit as per the addressing scheme.
  • 4. Power cycle: After correcting addresses and wiring, power off for 5 minutes, then restart the system.

Note: If E11 persists, a technician may need to reprogram or replace the control PCB.

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Repair Difficulty

Hard 4/5

Required Part

Indoor Main PCB
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