Coleman
No-Start Condition / Control Circuit Failure
Coleman air conditioner will not start at all; thermostat is calling for cooling but nothing happens.
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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 to Coleman air handler or condenser, Blown low-voltage fuse on control board, Failed thermostat, Open 24V transformer
How to Fix / Troubleshooting
Safety: Turn OFF breakers before removing covers. Use caution around live circuits.
- Verify power: Check that both indoor and outdoor breakers are ON and the outdoor disconnect is inserted.
- Check thermostat display: If blank, verify 24V between R and C at the thermostat. If no voltage, inspect the transformer and board fuse.
- Inspect control board fuse: Replace a blown low-voltage fuse with the same rating. If it blows again, there is a short that must be located.
- Jump test (advanced): At the air handler control board, briefly jumper R to Y and G to see if the condenser and blower start. If they do, the thermostat or its wiring is suspect.
- Replace faulty components: Replace a failed thermostat or transformer with Coleman-compatible parts.
Warning: Do not use larger fuses than specified; this can damage the control board.
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Repair Difficulty
Medium
3/5
Required Part
24V Control Transformer
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