10
Intergas
Flow Temperature Sensor (CH NTC) Fault
Boiler displays error code 10 and will not start, no heating or hot water
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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
Open circuit CH flow NTC sensor, Shorted CH flow NTC sensor, Damaged sensor wiring harness, Faulty main PCB NTC input
How to Fix / Troubleshooting
Warning: This fault involves internal electrical components. Do not remove the boiler casing unless you are a qualified engineer. Isolate power before any inspection.
- Reset the boiler: Turn the boiler off and on at the control panel. If code 10 reappears immediately, the sensor circuit is likely faulty.
- Check system temperature: Ensure the boiler is not genuinely overheated (radiators extremely hot). If it is, turn off the boiler and allow it to cool, then call an engineer.
- Visual inspection (external only): Check for any obvious damage to external wiring looms entering the boiler. Do not pull or strip cables.
- Engineer tasks: A Gas Safe engineer will test the CH flow NTC sensor resistance, inspect the wiring harness, and if necessary replace the CH flow temperature sensor or main PCB.
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Repair Difficulty
Hard
4/5
Required Part
CH Flow NTC Sensor
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