05 Your boiler has detected that the water inside the pump is getting too cold and has temporarily locked out to prevent the system from freezing.
Your boiler has detected that the water inside the pump is getting too cold and has temporarily locked out to prevent the system from freezing.
What to check first
- Ensure your heating is switched on so the boiler can run the pump and warm the system.
- Check that external condensate pipes or exposed pipes are not frozen.
- Reset the boiler using the reset button to see if normal operation resumes.
Parts commonly replaced
- NTC Temperature Sensor
- Printed Circuit Board (PCB)