C1
Hitachi Indoor Fan Motor Lock / Overload (Cassette/Ducted)

Ceiling cassette or ducted unit shows C1, fan may not run correctly

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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

Obstructed blower wheel, Failed fan motor capacitor (non‑inverter), Seized fan bearings, Faulty indoor fan motor

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker. Ceiling units are often heavy; use proper support when removing panels.

Steps:

  • Check filters and grilles: Clean return air filters and ensure supply grilles are open.
  • Inspect blower: Remove the grille and visually inspect the blower wheel for debris or foreign objects.
  • Spin test: Rotate the blower by hand to check for free movement.
  • Capacitor (if applicable): On non‑inverter models, a failed capacitor can prevent starting. Replacement should be done by a technician due to stored charge.

If C1 persists: The fan motor likely needs replacement.

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Repair Difficulty

Hard 4/5

Required Part

Indoor Fan Motor (Cassette/Ducted)
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