Hitachi Indoor Fan Motor Feedback / Hall Sensor Error

Unit stops with F9, may be associated with abnormal indoor fan behavior

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

Failed DC indoor fan motor hall sensor, Loose motor connector, Obstructed fan wheel, Faulty indoor PCB fan drive circuit

Safety first: Turn OFF the breaker before working near the indoor fan.

Steps:

Check for obstructions: Inspect and clear any debris from the cross‑flow fan.
Spin test: Ensure the fan rotates freely by hand.
Inspect connector: Verify the fan motor plug is fully inserted into the indoor PCB and not burnt.

If F9 persists: The fan motor assembly usually needs replacement. In some cases, the indoor PCB may also be faulty.

Medium 3/5

Indoor DC Fan Motor

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