Lochinvar Ignition Sequence Incomplete

Lochinvar water heater fan runs but burner does not light; 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 igniter, Weak flame sensor signal, Gas valve not opening, Low gas pressure

How to Fix / Troubleshooting

Safety: Turn off gas and power before removing burner or gas components. If you suspect a gas leak, contact a professional immediately.

Steps:

  • 1. Observe sequence: On a call for heat, confirm that the fan starts, then the igniter glows or sparks, then gas should flow. If igniter never glows/sparks, test and replace it.
  • 2. Check igniter: Inspect for cracks or damage. Measure resistance and compare to Lochinvar specs. Replace if open or out of range.
  • 3. Verify gas valve operation: Ensure the manual gas valve is open. A technician should verify that the control sends power to the gas valve during ignition.
  • 4. Clean flame sensor: Even without a code, a weak flame signal can cause immediate shutdown. Clean or replace the flame sensor.
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Repair Difficulty

Hard 4/5

Required Part

Igniter Assembly
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