Baxi
Compressor Start Failure Without Code
Outdoor unit fan runs, but the compressor does not start; no specific error code is shown.
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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
Failed compressor, faulty compressor start relay or contactor, open thermal overload on compressor, wiring fault between PCB and compressor
How to Fix / Troubleshooting
Safety: High voltage and high current are present. Only qualified technicians should test compressor circuits.
Homeowner checks:
- 1. Listen for the compressor: You should hear a deeper humming sound when the compressor runs. If only the fan noise is present, the compressor is not starting.
- 2. Cooling performance: If there is no cooling and the compressor is silent, turn off the unit and call a technician.
Technician tasks: Measure compressor winding resistance, check start components, and verify PCB outputs. Replace the compressor or PCB as required.
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Repair Difficulty
Professional Required
5/5
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