Sharp
No Power to Indoor Unit
Indoor unit does not power on at all; no lights or display.
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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
Tripped circuit breaker or blown fuse, Loose power terminal at indoor unit, Faulty indoor power supply PCB, Defective main power cord (portable/window units)
How to Fix / Troubleshooting
Safety first: Before opening any covers, turn off the breaker. For plug-in units, unplug from the outlet.
- Check breaker and outlet: Reset the dedicated breaker and test the outlet with another appliance to confirm power is present.
- Inspect power cord (portable/window): Look for cuts, burns, or kinks. Replace the cord if damaged.
- Indoor terminal block: Remove the indoor unit’s electrical cover and verify that L and N wires are firmly secured and not burnt.
- Fuse on PCB: Some Sharp indoor PCBs have a small fuse. If blown, investigate for short circuits before replacing with the same rating.
- PCB replacement: If power is present at the terminals but the unit remains dead, the indoor main PCB or power supply module likely needs replacement.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Main Control PCB
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