Hitachi
Outdoor Unit Non‑Operation
Outdoor unit not running while indoor fan blows normally (no cooling)
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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
Tripped outdoor breaker or fuse, Faulty outdoor PCB, Communication failure cable issue, Compressor or fan motor failure
How to Fix / Troubleshooting
Safety first: Turn OFF all power before opening the outdoor unit.
Steps:
- Check outdoor power: Some installations have a separate outdoor disconnect or breaker. Ensure it is ON.
- Listen for sounds: When the unit is commanded to cool, listen near the outdoor unit for relay clicks or fan/compressor attempts to start. Silence may indicate PCB or power issues.
- Inspect wiring: Check the interconnecting cable and terminals between indoor and outdoor units for loose or burnt connections.
If the outdoor unit remains dead: Professional diagnosis of the outdoor PCB, compressor, and fan motor is required.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Main Control PCB
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