Trane
Complete Power Loss to Furnace
Furnace will not start at all, no blower, no inducer, thermostat calling for heat
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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 internal fuse, Faulty door switch, Failed 120V to 24V transformer
How to Fix / Troubleshooting
Safety: Use caution around electrical panels and live circuits.
Steps to check:
- Breaker and switch: Confirm the furnace breaker is ON and the nearby service switch is ON.
- Door switch: Ensure the blower door is fully closed and engaging the safety switch.
- Board fuse: Inspect and replace the low-voltage fuse on the Trane control board with the same rating if blown.
- Transformer check (advanced): With a multimeter, verify 120V to the transformer primary and ~24V on the secondary. Replace the transformer if primary has power but no 24V output.
When to call a professional: If power issues persist or you are not comfortable testing voltage, contact a technician.
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Repair Difficulty
Medium
3/5
Required Part
24V Control Transformer
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