06
Biasi
Flow NTC Sensor Fault
Boiler displays error 06, temperature reading is erratic or boiler overheats quickly then shuts down.
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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 flow temperature sensor (NTC), Loose or corroded NTC wiring, Scale build-up around sensor pocket, Faulty PCB temperature input
How to Fix / Troubleshooting
Safety: Turn off power and allow the boiler to cool. Close isolation valves if removing sensors from the hydraulic block.
- Power cycle: Turn the boiler off and back on to see if the error clears temporarily, indicating an intermittent connection.
- Inspect NTC wiring: Locate the flow NTC on the primary flow pipe or hydraulic block of the Biasi boiler. Check the plug connection to the PCB and look for damaged insulation.
- Check resistance (engineer): A technician should measure the NTC resistance at room temperature and compare it to Biasi's resistance/temperature chart. A shorted or open sensor must be replaced.
- Descale sensor pocket: If accessible, remove the sensor and check for heavy limescale. Clean the pocket to ensure good thermal contact.
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Repair Difficulty
Hard
4/5
Required Part
Flow NTC Sensor
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