Termet Intermittent Lockout / Unstable Operation

Furnace frequently locks out and requires manual reset, but no specific code is displayed or codes vary.

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

Loose electrical connections, Intermittent flame sensing, Moisture on Termet control board, Marginal gas pressure

Safety: Turn off power and gas before inspection.

Check all connectors: Reseat plug-in connectors on the control board, gas valve, fans, and sensors.
Inspect for moisture: Look for condensation or water marks on the PCB and inside the cabinet. Correct any sources of leaks.
Clean flame sensor: Clean the ionization electrode as described in ignition-related procedures.

If lockouts continue, a Termet technician should monitor operation, check gas pressures, and review error history.

Hard 4/5

Ionization Electrode (Flame Sensor)

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