Vokera Return Temperature Sensor Fault

Boiler displays 07, may run briefly then shut down, and temperature readings are erratic.

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

Faulty NTC return sensor, loose or corroded connector, damaged wiring harness, PCB sensor input fault.

Safety first: Turn off electrical power before removing the front cover.

Check for obvious damage: Look for signs of water leaks around the return pipework that could affect the sensor or its wiring.
Engineer checks:
- Measure the resistance of the return NTC and compare it with the flow NTC at the same temperature.
- Inspect the sensor clip and ensure it is firmly attached to the pipe with good thermal contact.
- Check the continuity of the sensor wiring back to the PCB.
- If sensors test OK, suspect a PCB fault.

Sensor replacement is usually straightforward but should be done with the system depressurized if removal from a pocket is required.

Medium 3/5

Return NTC Temperature Sensor

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