Ideal boiler shows L1 and locks out, often with no hot water or heating
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: If you smell gas, do not attempt to reset the boiler. Turn off the gas at the meter, ventilate the area, and call your gas supplier and a Gas Safe engineer.
User checks:
- Check gas supply: Confirm that other gas appliances work. If not, there may be a supply issue.
- Check meter credit (prepay): Ensure you have credit and the gas meter is on.
- Reset once: Turn the boiler off and on, then press the reset button. Observe if the boiler lights and runs normally.
If L1 returns after a single reset, do not keep resetting. A Gas Safe engineer must check the ignition system, burner, and gas valve.