E06
Termet
Flow Temperature Sensor Fault (NTC Open/Short)
Display shows E06, furnace does not fire or shuts down, often related to temperature sensor issues.
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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
Defective NTC temperature sensor on flow pipe, Broken sensor wiring harness, Corroded connector on Termet control board, Sensor out of range due to scaling
How to Fix / Troubleshooting
Safety: Turn off power and allow the unit to cool.
- Locate the flow NTC sensor: On Termet hydronic furnaces, the flow sensor is usually clipped to the flow pipe or inserted into a sensor well near the heat exchanger outlet.
- Inspect wiring: Check the two-wire harness from the NTC to the control board. Look for cuts, burns, or loose plugs. Reseat the connector.
- Check sensor resistance (if you have a multimeter): Disconnect the sensor and measure resistance at room temperature. Compare with Termet’s NTC table (commonly around 10kΩ at 25°C, but verify in manual). Infinite or zero ohms indicates a bad sensor.
- Clean sensor pocket: If the sensor is in a well, remove it and clean any scale or sludge from the pocket.
Replace the sensor if readings are out of spec. If a new sensor does not clear E06, the control board may be faulty and should be checked by a Termet technician.
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Repair Difficulty
Medium
3/5
Required Part
Flow NTC Temperature Sensor
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