E17
Cointra
Internal Control Board Fault
Furnace displays E17, unit may not respond to thermostat commands.
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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 firmware, Damaged control electronics from surge, Overheated control board, Manufacturing defect
How to Fix / Troubleshooting
Safety: Disconnect power before touching the control board.
Steps:
- Power cycle: Turn off the main power for 5 minutes, then restore. If E17 reappears immediately, the fault is likely permanent.
- Check for visible damage: Inspect the control board for burn marks, swollen components, or moisture.
- Verify ventilation: Ensure the control compartment is not blocked and that the furnace is not installed in an excessively hot space.
Professional service: Control board replacement and firmware updates must be performed by an authorized Cointra technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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