Furnace displays E13, unit may start but then shuts down, sometimes with unusual noises from the flue.
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
Safety: Turn off power and gas. Flue components may be hot; allow them to cool.
Steps:
- Inspect flue routing: Check that the flue is installed according to Cointra guidelines (length, number of bends, slope). Look for crushed or disconnected sections.
- Check for obstructions: Examine the flue terminal outside for blockages. Remove any debris.
- Inspect flue gas sensor: Locate the flue gas temperature sensor on the flue outlet. Ensure it is firmly attached and wiring is intact.
Professional service: A technician should perform a combustion analysis, verify CO/CO₂ levels, and adjust the burner if necessary. If the flue gas sensor is defective, it should be replaced with a Cointra-approved part.
Repair Difficulty
Required Part
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