How to Test a Dryer’s Thermal Fuse

A broken thermal fuse is often the problem with many malfunctioning dryers. Thus, if your dryer isn’t performing well, it pays to know how to check the thermal fuse in your dryer. You’ll need a professional to install a new thermal fuse if one is required, but it helps to know the source of the problem when you’re troubleshooting a broken dryer.

Step 1: Turn off the power to the dryer at the main circuit breaker. There should be two circuit breakers that service the 220 V outlet, make sure both are in the off position.

TIP: The two breakers are often connected by a small piece of plastic to remind you to shut them both off at once.

Step 2: Use your owner’s manual to locate the main access panel. The thermal fuse is normally near the main access panel, and sometimes underneath it. If you do not know how to identify your dryer’s thermal fuse, look at your owner’s manual for the exact location.

Step 3: Remove the two wires that are connected to the thermal fuse with a pair of needle nose pliers. Note how each wire is attached using a diagram as necessary.

Step 4: With the thermal fuse removed, check the voltage using a voltage meter set to ohms. The correct reading for a dryer thermal fuse is zero, if you get the symbol infinity, it’s time to call a professional to replace and test the fuse.

Step 5: If the dryer thermal fuse tests at zero, then it is still in good working condition. Reattach the wires to the thermal fuse, as indicated by your diagram.

Step 6: Retest the dryer to see if there is still a problem. Sometimes it’s the connection, not the actual thermal fuse that is the source of your problem.

Step 7: If you still have a problem, you may want to check the dryer thermostats. Then, if there is no problem found, you should call an appliance repair professional.