20
Vokera
Sensor Open-Circuit / Disconnected
Vokera water heater shows code 20, appliance indicates sensor open-circuit or disconnection
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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
Unplugged sensor connector, Broken sensor lead, Failed NTC sensor, Corroded terminals
How to Fix / Troubleshooting
Safety first: Turn off power before removing the front cover or touching internal wiring.
Owner checks:
- If the fault appeared after recent work near the heater, inform the engineer; a connector may have been disturbed.
Engineer steps:
- Identify the affected sensor from diagnostic information.
- Check that the sensor plug is fully seated on the PCB and at the sensor end.
- Test continuity of the sensor cable and replace if open-circuit.
- Replace the NTC sensor if it reads infinite resistance.
After repair, clear the fault and verify stable temperature readings.
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Repair Difficulty
Medium
3/5
Required Part
NTC Temperature Sensor
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