Toshiba
Outdoor Unit Non-Operation Without Error
Outdoor unit not running while indoor unit blows air; no error code displayed.
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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
Outdoor breaker off, Loose interconnecting cable between indoor and outdoor, Faulty outdoor PCB, Failed compressor contactor or relay
How to Fix / Troubleshooting
Safety first: Turn off power at both indoor and outdoor disconnects before inspecting wiring.
- Step 1 – Check outdoor power: Ensure the outdoor unit’s breaker or isolator is ON.
- Step 2 – Inspect interconnecting cable: Verify that the multi-core cable between indoor and outdoor units is correctly wired (L, N, communication) and terminals are tight.
- Step 3 – Listen for outdoor start: With power on and cooling requested, listen for the outdoor fan or compressor attempting to start. Silence suggests a control or power issue.
- Step 4 – Technician diagnosis: If wiring and power are correct, a technician should test the outdoor PCB, compressor relay/contactor, and communication signals.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Control PCB
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