A41
Vokera
Flow temperature sensor fault reported by boiler
Thermostat shows A41 and heating demand is ignored
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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 boiler flow NTC sensor, Damaged sensor wiring harness inside boiler, Boiler PCB misreading sensor, Poor electrical connection at boiler sensor plug
How to Fix / Troubleshooting
Safety first: Do not remove the boiler combustion cover. Work only on user-accessible controls. Internal sensor replacement must be done by a qualified engineer.
- Confirm boiler code: Check the boiler display for A41 or a similar sensor error. The thermostat is only repeating the boiler's diagnostic.
- Power cycle: Turn off the boiler at the fused spur for 30 seconds, then turn back on. Sometimes transient sensor errors clear after a reboot.
- Check system temperature: Ensure the system is not overheating due to closed valves or blocked radiators, which can stress sensors.
- If A41 persists: A boiler engineer will need to test and likely replace the flow NTC sensor or wiring. The thermostat itself is not usually at fault.
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Repair Difficulty
Hard
4/5
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