Giant
Ignition Sequence Interruption
Water heater fan runs but there is no ignition and no error code displayed
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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
Faulty air pressure switch not closing, Igniter not receiving power, Gas valve not opening, Control board not sending ignition signal
How to Fix / Troubleshooting
Safety first: Turn off gas and power. Do not attempt repeated ignition if gas odor is present.
- Check pressure switch: Verify tubing and wiring to the Giant air pressure switch. Replace if it does not close with blower running.
- Test igniter voltage: With appropriate safety and tools, check for voltage at the igniter during start sequence. Replace igniter if no glow/spark with proper voltage.
- Gas valve operation: Ensure the manual gas valve is open. A technician should test for gas valve opening and manifold pressure.
- Control board: If all components test good, the Giant control board may be defective and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Giant Gas Control Valve
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