NO LED
Fraser-Johnston
No Power to Furnace or Failed Control Board
No LED light on control board; furnace completely dead; no blower or inducer operation.
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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 furnace breaker, Tripped blower compartment door switch, Open primary fuse, Failed integrated furnace control (IFC) board
How to Fix / Troubleshooting
Safety first: Turn off the breaker before removing access panels.
- Check breaker and service switch: Verify the furnace circuit breaker is ON. Check the furnace service switch (usually near the unit) is in the ON position.
- Verify door switch engagement: Ensure the blower compartment door is properly installed and depressing the door safety switch. The furnace will not power up if this switch is open.
- Inspect internal fuses: Some Fraser‑Johnston furnaces have line‑voltage fuses or breakers. With power off, inspect for obvious blown fuses or burned components.
- Test incoming power: With a multimeter (advanced), verify 120 VAC is present at the line terminals feeding the IFC board. If power is present but the board is dead, the board likely needs replacement.
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Repair Difficulty
Medium
3/5
Required Part
Integrated Furnace Control Board
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