Ignition Lockout
Grant
Repeated Ignition Failure
Boiler repeatedly attempts ignition three times then locks out with an ignition error indication.
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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
Incorrect electrode gap or position, Weak ignition transformer, Low oil pressure, Faulty burner control sequence
How to Fix / Troubleshooting
Safety: Isolate power and oil supply before removing burner. Combustion adjustments must be done with a flue gas analyser.
Engineer steps:
- Remove the burner and check ignition electrodes for correct gap and alignment as per Grant burner manual; replace if worn or cracked.
- Test the ignition transformer output; replace if spark is weak or intermittent.
- Measure and adjust oil pump pressure to the value specified by Grant for the boiler model.
- Verify the burner control box is following the correct ignition sequence; replace if timing is incorrect.
Users should not attempt these tasks; contact a Grant-registered oil engineer.
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Repair Difficulty
Professional Required
5/5
Required Part
Ignition transformer
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