No LED lights on control board; furnace completely dead.
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.
Possible Causes
How to Fix / Troubleshooting
Electrical safety: Use caution around the electrical panel. If breakers trip repeatedly, call a professional.
Step-by-step checks:
- 1. Check circuit breaker: Locate the furnace breaker in the main panel. If tripped, reset once by switching fully off then on. If it trips again, do not continue resetting—call a technician.
- 2. Verify furnace service switch: Ensure the switch near the furnace is ON. Replace if loose or damaged.
- 3. Inspect door safety switch: Confirm the blower door is properly installed and depressing the door switch. The furnace will not power up with the door removed.
- 4. Check internal fuse: With power off, inspect the control board fuse and replace if blown with the same rating.
When to call a professional: If there is still no LED after these checks, the transformer or control board may have failed and should be tested and replaced with Philco-compatible parts by an HVAC technician.
Repair Difficulty
Required Part
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