07
Vokera
Return Temperature Sensor Fault
Boiler shows 07, may run briefly then shut down, temperature readings 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
Faulty NTC return sensor, Loose or corroded connector, Damaged wiring harness, PCB sensor input fault
How to Fix / Troubleshooting
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 wiring.
- Engineer checks:
- Measure resistance of the return NTC and compare 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 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 depressurised if removal from a pocket is required.
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Repair Difficulty
Medium
3/5
Required Part
Return NTC Temperature Sensor
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