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Working on a Carrier sx from 1990, has three wire bi-metal pilot with spark and 100% lockout on the spark module. Homeowner says it only fails in cold o.d. temps (less than 35 degrees). Home owner finds unit off and silent, resets 120v and unit re-lights and runs. Don't know what parts have been replaced so far but it looks like a new spark mod. and the pilot was clean but I cleaned it again. Limit switch looks old but I think limit failure would cause the blower to run. Any ideas?

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Check the heater relay on the control board found in the blower part of this furnace. It's found in a steel enclosed box
I'm having the same problem currently. I now have the blower running constantly set the thermostat to on not auto. until the part arrives
This has happened before but this time the relay has gone cloudy from sparking on and off. Tapping the relay may help just be careful when you have bypassed the door switch.
Good luck

Posted on Dec 21, 2008

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