07
Immergas Return Temperature Sensor (NTC) Fault

Display shows 07, furnace may run at reduced power or stop, temperature readings are erratic

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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 return NTC sensor, Loose or corroded NTC connector, Damaged wiring harness to PCB

How to Fix / Troubleshooting

Safety: Disconnect power before removing covers.

Steps:

  • 1. Locate return NTC: The return NTC is mounted on the return pipe entering the boiler. Consult the Immergas service diagram for exact position.
  • 2. Inspect connections: Check that the sensor is firmly attached to the pipe and that the connector is fully seated. Look for moisture or corrosion.
  • 3. Dry and clean: If there is condensation, dry the area and clean the contacts with electrical contact cleaner.
  • 4. Sensor test (technician): Measure resistance and compare to the NTC curve. Replace the return NTC if readings are incorrect.
  • 5. Wiring/PCB: If the sensor is good, check continuity of the harness to the PCB. Replace harness or PCB as needed.
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Repair Difficulty

Medium 3/5

Required Part

Return NTC Temperature Sensor
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