Keystone
No Power / Dead Unit
Keystone air conditioner does not turn on at all; no lights or display when plugged in.
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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, blown internal fuse on control board, faulty power cord, failed main control board
How to Fix / Troubleshooting
Safety: Always unplug the unit before opening any panels. Do not bypass fuses with wire or foil.
Steps:
- Check outlet: Plug a lamp or tester into the same outlet to confirm power. Reset any tripped GFCI or breaker.
- Inspect power cord: Look for cuts, burns, or melted areas. If damaged, replace the entire cord set with a Keystone-compatible assembly.
- Access control compartment: Remove the front panel to access the main PCB. Look for an onboard glass or blade fuse. Test with a multimeter and replace with the same rating if blown.
- Board inspection: If the fuse blows again immediately or the board shows burn marks, the main control board or another component may be shorted and require professional diagnosis.
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Repair Difficulty
Medium
3/5
Required Part
Power Cord or Main Control Board
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