Noritz
Intermittent Ignition / Weak Spark
Noritz water heater fan runs but burner does not ignite; no error code displayed, intermittent issue.
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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
Marginal igniter electrode, Slightly low gas pressure, Loose ignition wiring, Dirty burner surface
How to Fix / Troubleshooting
Safety first: Turn OFF power and gas before accessing internal components.
Steps to check and correct:
- Clean igniter and burner: Remove the igniter and burner assembly and clean carbon and dust from surfaces. Reinstall securely.
- Inspect ignition wiring: Check for loose or corroded connectors between PCB and igniter. Reseat connectors.
- Check gas supply: Ensure gas valves are fully open and that other gas appliances are functioning normally. If multiple appliances show issues, contact your gas supplier.
- Professional service: If intermittent ignition continues, a technician should test igniter strength, gas valve operation, and PCB output.
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Repair Difficulty
Medium
3/5
Required Part
Igniter Assembly
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