Furnace displays E06; typically related to return temperature sensor problems.

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

Failed return NTC, Loose wiring, Shorted sensor, Control board fault

Safety first: Turn off power and let the system cool.

Locate return NTC: Find the sensor on the return pipe entering the heat exchanger or hydraulic group.
Inspect and reseat: Check the connector and cable for damage. Reseat the plug.
Test sensor: Measure resistance and compare to the expected value. Replace if defective.
Further diagnosis: If the sensor is fine, a technician should test the control board input.

Medium 3/5

Return NTC Temperature Sensor

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