E10
Baxi Compressor Start Failure / Phase Loss (for some multi-split or 3‑phase models)

Unit does not cool or heat; E10 displayed; compressor does not run

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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

Missing phase on power supply (3‑phase units), Loose compressor terminals, Faulty compressor contactor or relay, Defective outdoor main PCB

How to Fix / Troubleshooting

Safety: Three-phase systems are dangerous. Only qualified personnel should work inside the outdoor unit.

Homeowner checks:

  • 1. Confirm power supply: Ensure the main breaker feeding the Baxi outdoor unit is ON and not tripped.
  • 2. Visual inspection: With power off, look for burnt wiring or loose terminal screws at the outdoor isolator and main terminals.

Technician tasks: A professional should verify all phases are present, check compressor winding resistance, and test the outdoor PCB or contactor. Replacement of the outdoor PCB or compressor may be required.

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Repair Difficulty

Professional Required 5/5

Required Part

Compressor
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