7
Intergas DHW Temperature Sensor / NTC Fault

Code 7 on display, boiler does not respond to hot water demand

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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

Open circuit DHW NTC sensor, Shorted DHW NTC sensor, Loose DHW sensor connector, Faulty PCB DHW input

How to Fix / Troubleshooting

Safety first: Turn off power and close the cold water isolation valve to the boiler if you need to remove any DHW components.

Checks:

  • Locate DHW NTC: On Intergas combi units, the DHW NTC is usually clipped to the domestic hot water outlet or integrated into the plate heat exchanger manifold.
  • Inspect connection: Ensure the sensor is firmly attached to the pipe and that the plug is fully seated in the harness.
  • Resistance test (technician): With power off, disconnect the DHW NTC and measure resistance at room temperature. Compare to Intergas NTC tables. Replace if open or shorted.
  • Check wiring to PCB: Look for damaged insulation or corroded pins at the PCB connector.

If a new DHW NTC does not clear code 7, the PCB may be defective and should be replaced by a qualified Intergas engineer.

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Repair Difficulty

Medium 3/5

Required Part

DHW NTC sensor
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