F7
Hisense
Phase Loss / Power Supply Abnormality (for 3‑phase or specific models)
Indoor unit displays F7 and the unit may not start or may shut down unexpectedly.
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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
Missing phase on 3‑phase supply, Loose power terminal connections, Incorrect wiring at breaker or disconnect, Faulty outdoor PCB power detection circuit
How to Fix / Troubleshooting
Safety first: Power supply issues involve dangerous voltages. Only qualified personnel should work inside the electrical panel.
- Step 1 – Visual check:
- Ensure the outdoor unit disconnect is fully inserted and not partially engaged.
- Inspect the power cable for visible damage.
- Step 2 – Verify supply (electrician/technician):
- A qualified person should measure voltage at the outdoor unit terminals and confirm all phases (if 3‑phase) are present and balanced.
- Step 3 – Tighten terminals:
- With power off, tighten all terminal screws at the outdoor unit and breaker.
- Step 4 – PCB check: If supply is correct but F7 remains, the outdoor PCB phase detection circuit may be faulty and should be replaced by a technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Power Terminal Block
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