Boiler displays GAS or Gas Fault; unit will not fire.
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 operate any electrical switches. Leave the building and call your gas supplier or emergency services. Do not attempt to repair gas piping yourself.
- Check manual gas valve: Ensure the gas cock near the Laars boiler is fully open (handle parallel to the pipe).
- Verify other gas appliances: If other gas appliances are not working, contact the gas utility.
- Inspect gas valve wiring: With power off, check that the gas valve connector is firmly attached and wires are not damaged.
- Reset boiler: After confirming gas supply, reset the boiler once. If GAS fault persists, stop and call a technician.
When to call a professional: Gas valve testing, replacement, and pressure adjustments must be done by a licensed gas technician.
Repair Difficulty
Required Part
We may earn a commission from links on this page.