E08
Baxi Overcurrent / DC Bus Overload Protection

Unit displays E08 and stops; often associated with power-up or compressor start

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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

Shorted compressor windings, Shorted IPM (inverter power module) on outdoor PCB, Power supply voltage issues, Wiring short between compressor and PCB

How to Fix / Troubleshooting

Critical safety: This is a high-voltage inverter fault. Do not attempt board-level repairs unless qualified. Always isolate power and verify with a meter.

Steps (visual checks only for homeowners):

  • 1. Power reset: Turn off power for 10 minutes, then restore. If E08 reappears immediately, do not keep retrying.
  • 2. Inspect outdoor wiring: With power off, remove the outdoor cover and check compressor cables for burns, melted insulation, or loose terminals.
  • 3. Check PCB for damage: Look for burnt components or cracked IPM module on the outdoor main PCB.

Action: E08 typically requires a professional to test compressor windings, DC bus, and inverter module. Likely parts are the outdoor PCB or compressor.

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Repair Difficulty

Professional Required 5/5

Required Part

Outdoor Main PCB (Inverter Module)
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