Staff Answer
Sep 27, 2026 - 06:35 PM
Unplug the two wires from the fan thermostat and connect them to each other with a jumper wire. That bypasses the thermostat, so the fans should run right away as long as they're getting 12V. If they run with the jumper, the thermostat is bad. If they still don't run, check the fans and the 12V supply. The 618093 thermostat is discontinued and has been replaced by the 640235.
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