MrCool
No Power to Indoor Unit
Unit will not power on at all; no lights on indoor display and no response to remote.
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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 breaker, Blown indoor fuse on PCB, Loose power wiring, Failed indoor main control board
How to Fix / Troubleshooting
Safety first: Use caution when working around electrical panels. Turn off main power if needed.
Steps:
- Check breaker: Locate the dedicated breaker for the MrCool system and reset it if tripped. If it trips again immediately, stop and call a technician.
- Verify outlet/disconnect (for some models): Ensure any local disconnect or plug is fully engaged.
- Inspect indoor PCB fuse: With power OFF, open the indoor control box and check the small glass or blade fuse on the PCB. Replace with the same rating if blown.
If still dead: The indoor main control board may have failed and should be tested and replaced by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Main Control Board (PCB)
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