LOCKOUT (DISPLAY)
Gibson Ignition Lockout After Repeated Failed Attempts

Control indicates ignition lockout, furnace will not attempt to start until power is cycled

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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

Persistent ignition failure, Flame not proven after ignition, Gas supply interruption, Faulty ignition control on Gibson board

How to Fix / Troubleshooting

Safety first: If you smell gas, do not attempt to relight or reset. Evacuate and call the gas utility or fire department.

Steps to check:

  • Cycle power: Turn off furnace power for 30–60 seconds to clear lockout, then restore power and call for heat. Observe the ignition sequence.
  • Check flame sensor and ignitor: Clean the flame sensor and inspect the hot surface ignitor as described in earlier steps.
  • Verify gas supply: Confirm gas valve to the furnace is open and other gas appliances are working.
  • If lockout returns: A technician should check ignition timing, gas pressure, and control board operation.
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Repair Difficulty

Hard 4/5

Required Part

Ignition Control Board
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