Bosch No Power to Indoor Unit

The air conditioner does not start at all; there are no lights on the indoor unit.

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.

Possible Causes

Tripped circuit breaker, Blown internal fuse on indoor PCB, Loose power wiring at the indoor terminal block, Faulty indoor power supply circuit

Safety first: Be cautious around mains voltage. If unsure, call a qualified electrician.

Steps:

Check breaker: Locate the dedicated circuit breaker for the Bosch AC unit 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 the 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.

Medium 3/5

Indoor Power Supply / Main PCB

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