How to Check a Dryer Thermostat With a Multimeter
As an Amazon Associate we earn from qualifying purchases.
The person typing how to check a dryer thermostat with a multimeter wants to know whether the thermostat that controls or limits the dryer’s heat has opened, which can leave the dryer cold or stop it heating. A multimeter can show whether the thermostat has a complete path with the dryer unplugged. It cannot tell you the trip temperature or the correct part for your model, because the sources we opened do not cover those figures. Use the dryer’s manual for them. Each step below names the check, the setting and the result, so the reader can stop at the first clear answer.
Quick answer
- Unplug the dryer or switch off its breaker, and test only with the power off.
- Disconnect one lead of the thermostat so the meter reads the thermostat alone.
- Set the meter to continuity. A beep means a complete path. No beep means the thermostat has opened.
- An open thermostat usually needs replacement rather than a reset. Confirm the part with the manual.
- The sources we opened do not give the trip temperature or part number for any dryer model.
Safety first: a dryer runs on mains power, and the heating circuit is a high-current load. Unplug the dryer, or switch off its breaker, before you open any panel. If the thermostat is reached only by removing parts you are not comfortable handling, or if the test points to a problem in the wall outlet, call a qualified appliance technician or electrician.
What a dryer thermostat does
A dryer thermostat is a temperature-sensitive switch. It closes or opens a circuit based on the heat it senses, and it can protect the heating element from overheating. Dryers can have more than one thermostat, such as an operating thermostat and a high-limit thermostat, and the names differ by brand. Your model’s manual shows which thermostat is which, and where each one is wired.
A thermostat that has opened can leave the dryer heating poorly or not at all. The fault can also be elsewhere, such as the heating element, the thermal fuse, the timer or the door switch. A single thermostat test is one check in a longer diagnosis.
Tools you need
- A digital multimeter with a continuity mode and an ohms mode.
- The service manual or wiring diagram for your exact dryer model.
- Insulated screwdrivers, and a phone camera to photograph the wire positions before you disconnect them.
Fluke’s continuity guide describes continuity mode as the setting that beeps when a complete path is detected. Fluke’s resistance guide says the meter should show OL with no leads connected, and that autorange mode picks the best range for the reading.
Step-by-step check
Step 1: Unplug and confirm the power is off
Unplug the dryer or switch its breaker off. Fluke’s resistance guide says to turn off power to the circuit before a resistance reading, and to discharge any capacitor in the circuit first. Dryers generally do not need a capacitor discharge for this test, but check your manual.
Step 2: Locate the thermostat
Find the thermostat in your model’s diagram. Thermostats are usually near the heating element or the exhaust path. Photograph the wiring before you disconnect anything, and note which thermostat is the operating one and which is the high-limit one.
Step 3: Disconnect one lead
Remove one wire from the thermostat, so the meter reads the thermostat and not the wiring around it. Fluke’s guidance on isolating a component is the same: a parallel path through other parts can change the reading.
Step 4: Check the meter
Set the meter to continuity. Touch the probes together and confirm the beep before you test the thermostat.
Step 5: Test the thermostat for continuity
Touch one probe to each thermostat terminal. A beep means the thermostat is closed and has a complete path. No beep means it is open. Hold the probes firmly, because loose contact can give a false open result.
Step 6: Read the resistance
Switch to ohms with autorange on. A low reading, close to zero, means the thermostat has a path. An OL reading means no complete path. Fluke’s fuse guide describes an infinite OL reading as a blown part for fuses. For a thermostat, OL means it has opened at room temperature.
Step 7: Decide what to do
If the thermostat is open at room temperature, replace it with the part your manual lists. Do not bridge the terminals to make the dryer heat. A bypassed thermostat removes the protection it was installed to provide.
Reading the results
| What you see | What it usually means | Next step |
|---|---|---|
| Beep in continuity mode | Thermostat is closed at room temperature | Check the other parts in the heating path, using the manual |
| No beep, OL in ohms mode | Thermostat is open at room temperature | Replace it with a matching part, after checking the cause |
| Beep only when the probes move | Loose connector or wire | Repair the connection before replacing the thermostat |
| Result differs from the manual | Model-specific value not verified here | Use the manual or a technician’s assessment |
What a room-temperature test does not show
A thermostat tested cold can read as closed and still fail when hot, or it can open only at its trip temperature. A cold continuity test is a useful first check, but it does not confirm the trip temperature. The sources we opened do not give a trip temperature for any dryer thermostat, so the manual has to supply that figure.
Mistakes to avoid
- Testing with the dryer plugged in or the breaker on.
- Bridging an open thermostat to restore heat. That removes the protection.
- Replacing the thermostat without checking the heating element, thermal fuse and wiring that feed it.
- Using a part number from another brand or model.
How this guide was built
This guide uses three opened Fluke Learn sources: the continuity guide, the resistance guide and the fuse guide. The fuse guide describes fuse steps that the thermostat check borrows for the meter settings. Dryer-specific values and part numbers must come from the manual. For basic meter use, see How to Test a Multimeter and How to Read Multimeter Symbols and Dial Positions.
How we chose
The steps are ordered the way a reader works: power and safety first, then isolating the part, then reading the result. The sources were limited to Fluke Learn pages opened on 2026-10-27. Parts-retailer and repair-forum pages that search returned were not used as sources. Each step names only what the opened source states, and any value that the opened sources do not give is marked as not verified.
What we could not verify
- The trip temperature of any dryer thermostat.
- The thermostat locations and part numbers for specific dryer models.
- The fault that causes a thermostat to open in a given dryer.
FAQ
Can a multimeter check a dryer thermostat?
Yes, for a basic open-or-closed check at room temperature, with the power off and one lead disconnected.
My dryer does not heat. Is the thermostat the cause?
It can be, but the heating element, the thermal fuse, the timer and the door switch can also stop heat. Test the thermostat as one step, and use the manual for the rest.
Can I reset a dryer thermostat?
Some thermostats reset and some do not. Check the manual before you assume, and never bridge the terminals to force heat.
What does OL mean on the meter?
Fluke describes OL as an infinite reading, meaning no complete path. For a thermostat at room temperature, that means it has opened.
Should I test a dryer outlet with this meter?
That is a separate task. If the dryer’s supply is in question, call a licensed electrician rather than testing the wall outlet as a homeowner.
Bottom line
Unplug the dryer, disconnect one lead of the thermostat, and check it for continuity at room temperature. An open reading points to a failed thermostat, so confirm the part in the manual and look at the rest of the heating path before replacing anything.
Sources
- Fluke, “How to Test for Continuity,” opened 2026-10-27: https://www.fluke.com/en-us/learn/blog/digital-multimeters/how-to-test-for-continuity
- Fluke, “How to Measure Resistance with a Digital Multimeter,” opened 2026-10-27: https://www.fluke.com/en-us/learn/blog/digital-multimeters/how-to-measure-resistance
- Fluke, “How to Check a Fuse with a Multimeter,” opened 2026-10-27: https://www.fluke.com/en-us/learn/blog/digital-multimeters/how-to-check-fuse-with-multimeter
