If the furnace fan limit switch is sticking and either not allowing the fan to turn off or turn on then it s time to replace the switch.
Furnace fan limit switch sticking.
With the fan limit control it is possible it could also be sticking and needs replacing.
Setting the middle arm at this temperature ensures that the fan will switch on at the correct time when the furnace warms ups.
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11 thoughts on test and replace the fan limit switch on a furnace barney july 20 2020.
Check to make sure the fan is not in the fan on position on your thermostat.
Step 3 slide the cover off the control switch or lift it up.
Either way something is sticking when it should not be stocking and the device needs to be replaced to correct the problem.
It should be located near the top of the furnace within the panel.
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Once the fan limit switch has sensed that the air in the plenum is a suitable temperature usually around 20 degrees above the room temperature it engages the blower fan to distribute air.
Look for the fan limit control switch encased in a small rectangular box.
The fan limit switch tells the blower assembly when it is ok to blow the heated air.
The fan limit switch is responsible for turning the blower on and off at the appropriate times.
If your furnace goes off on high limit or if one of the rollout switches are open then the furnace fan will run all the time because the furnace control board is telling the furnace that the furnace has over heated and the fan runs to cool the furnace down.
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Furnace temperature fan limit switch wiring diagram sample illustration for safety circuit.
Limit switch issue furnace blower fan wont turn off if the furnace overheats then a limit switch will open.
So when the switch is working correctly your furnace fan should turn on several minutes after thermostat calls for heat and turn off several minutes after the heat cycle ends.
Goodman oem furnace 11 replacement combination fan limit switch.
Follow the basic rules and replace it with an exact replacement.
Fan limit switch moves past fan off then past fan on blower doesn t start until about 10 20 degrees above fan on then blower runs on for 30 seconds and shuts off for a few minutes turns back on for 30 seconds and shuts off for a few minutes.
My furnace fan stays on even after the furnace has cooled off until i bang the furnace cover then it goes off is that the fan limit switch sticking on.
When the room temperature reaches the thermostat setting the furnace.
