Unit stops cooling, indoor unit shows F1, compressor does not run
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Refrigerant handling must be done by licensed personnel. Do not attempt to open the refrigerant circuit yourself.
User‑level checks:
- Check for icing: Look at the indoor coil and refrigerant pipes. If they are icing up, turn the unit OFF and allow ice to melt. Do not chip ice with tools.
- Listen for hissing: A continuous hissing sound near joints may indicate a leak. Do not touch oily or frosted pipes with bare hands.
- Visual inspection: Look for oil stains on flare joints, service valves, or coils. Oil often marks the location of a refrigerant leak.
Next steps (technician required): A professional should perform leak detection, repair the leak, evacuate the system, and recharge with the correct type and quantity of refrigerant specified by Hitachi.
Repair Difficulty
Required Part
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