No Flame
Grant
Ignition or Fuel Delivery Failure
Boiler display indicates 'No Flame' or similar, burner does not establish a flame and shuts down.
Advertisements
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.
Advertisements
Possible Causes
No oil at burner due to blocked oil filter, Air in oil line, Faulty ignition transformer, Stuck or failed oil solenoid valve
How to Fix / Troubleshooting
Safety: Isolate power and oil supply before working on the burner. Only qualified oil engineers should open fuel components.
User checks:
- Confirm oil level in the tank and that the oil isolation valve is open.
- Check for obvious damage or kinks in the oil supply line to the Grant boiler.
Engineer checks:
- Inspect and replace the oil line filter (often a Tigerloop or inline filter on Grant installations) if contaminated.
- Bleed the oil pump to remove air, using the bleed screw while running the burner.
- Test the ignition transformer output and HT leads; replace if weak or intermittent spark is detected.
- Check the oil solenoid valve coil for correct resistance and operation; replace the valve or coil if faulty.
Do not attempt to adjust oil pump pressure or combustion settings without proper equipment and training.
Advertisements
Repair Difficulty
Professional Required
5/5
Advertisements