Bosch
No Power to Indoor Unit
Air conditioner does not start at all; no lights on the 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 internal fuse on indoor PCB, Loose power wiring at indoor terminal block, Faulty indoor power supply circuit
How to Fix / Troubleshooting
Safety first: Be cautious around mains voltage. If unsure, call an electrician.
Steps:
- Check breaker: Locate the dedicated breaker for the Bosch AC and reset it if tripped. If it trips again immediately, leave it off and call a professional.
- Check wall switch/isolator: Ensure any local isolator switch near the indoor unit is turned on.
- Inspect indoor LED: If there are no indicator lights at all, an internal fuse or power supply may have failed.
Advanced: A technician can open the indoor unit, test for voltage at the terminal block, and replace the internal fuse or PCB if necessary.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Power Supply / Main PCB
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