Boiler shows E07, may run briefly then shut down, return temperature reading abnormal

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 sensor, Loose sensor connection, Wiring harness damage, Sensor pocket airlocked

Safety: Turn off power before accessing internal components.

User checks:

Reset the boiler once. If the error persists, professional diagnosis is required.

Engineer checks:

Identify the return NTC sensor on the Keston return pipework. Inspect for signs of water ingress or corrosion at the connector.
Test sensor resistance and compare with manufacturer data; replace if faulty.
Check wiring continuity back to the PCB and repair any damaged sections.
Bleed air from the boiler and nearby pipework to ensure the sensor is in contact with water, not air.

Medium 3/5

Return NTC Sensor

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