E19
CTC
Control Board Configuration / EEPROM Fault
Furnace indicates internal memory or configuration error on control board.
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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 firmware, Power surge damage, Incorrect dip switch or jumper settings, Failed CTC control board
How to Fix / Troubleshooting
Safety first: Turn off power before adjusting any board settings.
Steps:
- Remove the blower door and locate the CTC integrated control board.
- Compare dip switch or jumper settings to the installation manual for your furnace model (stages, blower speed profiles, etc.). Correct any misconfigurations.
- Cycle power to the furnace to clear transient errors.
- If the error returns immediately and settings are correct, the board's memory may be damaged.
- Replace the control board with the exact CTC replacement part number, transferring any configuration jumpers or dip switch settings as specified.
Recommendation: Board replacement and configuration should be done by a qualified technician to ensure safe operation.
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Repair Difficulty
Professional Required
5/5
Required Part
CTC Integrated Furnace Control Board
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