E18
Kospel
Outdoor Temperature Sensor Fault (if equipped)
Furnace shows E18; may be accompanied by erratic temperature readings or frequent cycling.
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Possible Causes
Failed outdoor NTC sensor, Broken sensor cable, Incorrect sensor placement, Corroded terminal connections
How to Fix / Troubleshooting
Safety: Turn off power before connecting or disconnecting the outdoor sensor.
- Locate outdoor sensor: It is usually mounted on an external north-facing wall away from direct sun.
- Inspect cable: Check for cuts, UV damage, or loose junction box connections.
- Test sensor: Measure resistance and compare with Kospel's NTC chart. Replace if out of range.
- Check controller settings: Ensure weather-compensation is configured correctly in the Kospel control menu.
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Repair Difficulty
Easy
2/5
Required Part
Outdoor Temperature Sensor
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