Lochinvar
Delayed Ignition / Improper Light-off
Boiler ignites with a loud boom or delayed ignition noise
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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
Dirty burner, incorrect electrode gap, low gas pressure, slow-opening gas valve
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Delayed ignition can damage the boiler and venting.
- Inspect and clean burner: Remove the burner assembly and clean thoroughly, removing dust, rust, and debris. Do not enlarge or deform burner ports.
- Check ignition electrode: Verify electrode position and gap per Lochinvar specifications. Replace if cracked or eroded.
- Do not adjust gas valve: Gas pressure and valve operation must be checked and adjusted only by a licensed gas technician with proper instruments.
Professional help: Delayed ignition requires prompt professional evaluation to prevent further damage.
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Repair Difficulty
Professional Required
5/5
Required Part
Ignition Electrode Assembly
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