C6
Viessmann
Cylinder Charging Temperature Sensor Fault
Thermostat shows C6 and cannot read the cylinder charging temperature; DHW charging control is impaired.
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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 cylinder charging sensor, Disconnected sensor from boiler controller, Damaged sensor cable, Incorrect sensor type configured
How to Fix / Troubleshooting
Safety first: Turn off power to the boiler and be cautious around hot water cylinders and pipes.
- Identify sensor: Locate the cylinder charging sensor on the hot water cylinder or charging line as per the boiler manual.
- Check connection: Ensure the sensor is firmly attached to the cylinder and that its cable is securely connected to the boiler control board.
- Inspect cable: Look for damage or pinching along the cable route.
- Verify configuration: In the boiler installer menu, confirm that the correct sensor type and function are selected.
- Replace sensor: If readings are missing or unrealistic, have a technician replace the Viessmann cylinder charging sensor.
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Repair Difficulty
Professional Required
5/5
Required Part
Viessmann cylinder charging temperature sensor
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