Kospel Early Flame Failure or Safety Interlock Trip

Furnace starts but shuts down after a few seconds without showing an error code.

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.

Possible Causes

Weak flame signal, Unstable gas supply, Faulty flame sensor, Loose safety interlock wiring

Safety: Turn off gas and power before inspecting combustion components.

Clean flame sensor: Remove and gently clean the ionization electrode with fine abrasive pad.
Check grounding: Ensure the furnace chassis ground connection is tight and free of corrosion.
Inspect safety circuits: Check wiring to overheat thermostats and safety switches for loose connections.

If the problem persists, a technician should perform combustion analysis and check gas valve operation.

Hard 4/5

Flame Sensor (Ionization Electrode)

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