When my thermostat reaches the desired temperature, the furnace fan shuts off briefly, then cycles on and off a few times. Several internet posts pointed me to the limit switch, which seems to make sense, so I replaced it. The new switch exhibits the same problem, so I'm not sure whether I got a bad switch or there's something else going on. Is there a way to test the limit switch to rule that out? If so, where do I look next? There seems to be a resistor inline with one of the limit switch leads, but I don't know what it's rated at.
The furnace is a 25-year-old Carrier. The model number and serial number are illegible, and I don't have a manual for it.