Fujitsu
No Power to Indoor Unit
Unit will not start at all; no lights or response from indoor unit
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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 circuit breaker, Blown indoor unit fuse on PCB, Loose power wiring at indoor terminal block, Failed indoor PCB power supply
How to Fix / Troubleshooting
Safety first: Before resetting breakers, ensure there is no burning smell or visible damage. Do not repeatedly reset a breaker that trips immediately.
- Check breaker: Locate the dedicated breaker for the Fujitsu system and reset it if tripped. If it trips again, leave it off and call a technician.
- Verify outlet (if applicable): For some small units, confirm the wall outlet has power by plugging in another device.
- Inspect indoor unit: With power off, remove the front cover and check for an internal fuse on the PCB. Replace only with the same type and rating if blown.
- Wiring check: Ensure power wires are securely connected at the indoor terminal block (technician task).
- PCB replacement: If power is present but the unit remains dead, the indoor PCB power supply may have failed and requires replacement.
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Repair Difficulty
Medium
3/5
Required Part
Indoor PCB Fuse
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