You can test the limit switch with a multimeter. If it turns out that you do, then you can go forward to replace it. But first, you should make sure whether you need to replace it or not. Replacing the limit switch isn’t that difficult either. But what if it can’t be adjusted? Well, in that case, you’ll need to replace your switch. Ideally there should be sufficient separation between gas and electricity. That is, turn on the gas first if it’s a gas furnace. Once you’re done, put everything back in place and trace back your steps. This will set the pointers to the expected temperature. Instead, push down on the face of the switch and pull the arms. To reset the switches don’t just turn the arms. The middle one tells the furnace to distribute hot air on reaching the set temperature. Next, the middle between 100℉ – 110℉ and the last one to 90℉. Start by setting the one on the bottom to 200℉. The other will turn it on when you find the furnace reaching at a certain temperature. If the temperature in the furnace gets too high this switch will turn the burner off. The one on the bottom will be for turning off the burner. Your furnace limit switch will have three arms. Some panels will require screwdrivers to be accessed. To access the switch you’ll have to remove the cover on the panel.
The switch will be at the top of the panel under the heating ducts. What sort of venting you use can affect heating performance. On a completely separate note, you should look into the venting options for your gas furnace.
Locate the gas supply and turn the valve off. If it’s a gas furnace, you’ll also need to turn off the gas.
Locate the breaker labeled furnace and switch it off. The first thing to do is to turn off the power to the furnace. Step 1: Ensuring Your Safetyīefore you get to work on the furnace, you’ll have to ensure your own safety. So, just stay tuned with us and learn the way to reset the switch. For your convenience, I will break it up into a few steps. Together these switches help the furnace safely maintain the set temperature in the house. And a third one that ensures the fan turns on once the burner is hot enough. Basically, there are three limits on the limit switch.Īn upper limit for when the burner is turned off. It controls when the burner starts and stops heating, and when the blower fan turns off. This issue is dealt with by the limit switch. If left running continuously your heating bills will skyrocket.
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