13
Immergas Flue Gas Temperature Sensor Fault

Display shows 13, furnace may run at reduced output or stop intermittently

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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 flue gas NTC sensor, Loose sensor connection, Sensor damaged by overheating due to flue blockage

How to Fix / Troubleshooting

Safety: Flue components can be hot and contain combustion products. Allow cooling and ensure good ventilation.

Steps:

  • 1. Inspect flue gas sensor: The sensor is usually clipped into the flue outlet or on the primary heat exchanger. Check that it is firmly attached and the cable is intact.
  • 2. Check connector: Reseat the connector on the PCB and inspect for corrosion.
  • 3. Technician test: Measure sensor resistance and compare to the NTC curve. Replace if out of range.
  • 4. Check for flue blockage: If the sensor has overheated, the flue may be partially blocked. A qualified technician must inspect and clean the flue system.
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Repair Difficulty

Hard 4/5

Required Part

Flue Gas NTC Sensor
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