Klimaire
Outdoor Unit Non-Start / Contactor or Control Failure
Indoor fan runs but outdoor unit does not start; no cooling or heating.
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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
No power at outdoor unit disconnect, Failed outdoor main PCB, Open compressor thermal protector, Communication failure between indoor and outdoor
How to Fix / Troubleshooting
Safety first: Turn OFF power at the outdoor disconnect before opening the cabinet.
- Step 1 – Verify outdoor power: Ensure the disconnect is ON and that voltage is present at the outdoor unit terminals (qualified person only).
- Step 2 – Listen for relay click: When the indoor unit calls for cooling, listen at the outdoor unit for relay or contactor clicks. Silence may indicate a control issue.
- Step 3 – Check for error codes: Look at the indoor display for any communication or protection codes (E1, E5, etc.). Address those first.
- Step 4 – Professional diagnosis: If power is present but the outdoor unit remains off with no codes, a technician should test the outdoor PCB, compressor, and fan circuits.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Main Control Board or Outdoor Contactor/Relay
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