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Craig, Electrical Technician
Category: Appliance
Satisfied Customers: 4529
Experience:  33 years experience electrical troubleshooting industrial equipment and control systems.
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I have a Gibson Furnace model # GL1RA072C-12B. The thermostat

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I have a Gibson Furnace model # XXXXX The thermostat batt had split and i replaced with new triple A batts. Furnace blower is continuous. Furnace code indicates "limit Circuit open or External Load on "W". How do i fix this. Where is the limit cuircuit.

The blower motor is controlled by the 'fan switch' it's on the side of the furnace duct and feeds the fan relay. It's a thermostat for sensing the heat before turning on the blower. It's bad and runs the fan continuously. Replace the fan switch.
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