Toshiba
No Power to Indoor Unit
Indoor unit does not power on at all; no lights or display.
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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 PCB fuse, Loose power wiring at indoor terminal block, Failed indoor power supply circuit
How to Fix / Troubleshooting
Safety first: Turn off the main breaker before opening any electrical covers. Use a non-contact voltage tester to confirm power is off.
- Step 1 – Check breaker: Locate the dedicated breaker for the Toshiba AC and reset it if tripped. If it trips again immediately, stop and call a technician.
- Step 2 – Verify power at indoor unit: Remove the indoor electrical cover and confirm that supply wires are firmly connected and not burnt.
- Step 3 – Inspect PCB fuse: Look for a small fuse on the indoor PCB. If blown, replace only with the same rating after checking for obvious shorts.
- Step 4 – Test with remote and manual button: Some Toshiba units have a manual ON/OFF button under the front panel. Try starting from there to rule out remote issues.
- Step 5 – Replace indoor PCB: If power is present but the unit remains dead, the indoor control PCB power supply is likely faulty and needs replacement.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Control PCB
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