55
Luxaire Control Board Fault or Configuration Error

Furnace LED displays code 55; indicates control board memory or configuration error; furnace may not operate.

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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

Corrupted control board memory, Incorrect dip switch settings, Failed control board, Voltage surge damage

How to Fix / Troubleshooting

Safety: Turn off power before adjusting dip switches or replacing the control board.

Steps to check:

  • Power reset: Turn off the breaker for 1 minute, then restore power to see if the code clears.
  • Verify dip switches: Compare the dip switch settings on the Luxaire control board to the installation manual for your furnace model (for blower speed, staging, etc.). Incorrect settings can cause faults.

When to call a pro: If code 55 persists, the control board likely needs replacement and configuration by a technician using the correct Luxaire replacement board.

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Repair Difficulty

Hard 4/5

Required Part

Integrated Furnace Control Board
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