However, for some parts like a switch, fuse or electrical component, you will need to test the part using a test meter (also called a multimeter or a volt-ohm meter) in order to check it for continuity. Your tester will have two wires with lead tips. If there is any reading on any of these then the motor is bad, do not use it. A dryer's timer motor keeps tabs on how long the drying cycles will run when you use your dryer. The smaller the motor, the higher this reading will be, but it should not be open. The most frequent cause for a clothes dryer's failure to start is a malfunctioning door switch. For this particular test we are going to be testing with the Ohm settings. Thermostats-Cycle and safety thermostats-read them with an ohm meter. How common thermostats work. Before you can begin to test your dryer's timer motor, you must first locate the device. Step 3 - Remove Belt. With a PTC thermistor at room temperature or below, the thermistor should measure a very low resistance. Meter testing and usage tips. Volt meter (Ohm meter) The cheapest of cheap volt meter can be used for this test. The Ohm symbol looks like an upside down horseshoe. The windings (all three in a three-phase motor) should read low but not zero ohms. Power supply-check power supply at terminal block where cord enters the dryer. Should read 240V. Test the lead. How to Test a Dryer Timer Motor. The problem with these static tests is that you are only using the low DC voltage of the meter to test the capacitor while in actual use, they will have 120vac across them. Now apply heat, just like before, to the thermistor's body. It will usually be low enough (under 30 Ω) … How to Test a PTC Thermistor. You can test the centrifugal switch by disconnecting the power supply and the two Red wires from 2M and 1M. TIP: If you do have a timer motor that has failed, consider replacing just the motor itself and not the entire assembly. See images below. Read the results on the tester, then repeat the same procedure with the other exposed wire lead. Once you have located the dryer motor, remove the rubber belt from the motor with your hands or with the assistance of a screwdriver. It is a part of the timer assembly. One of the tips should touch the motor's case while the other touches one of the exposed wire leads. In order to access the motor, you will need to turn the dryer on its side. Step 2 - Turn Dryer on Its Side. Step 4 - Check for Obstructions in the Blower Fan. Timer motors can be considerably cheaper than the complete timer assembly. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. I have a piece of test equipment that will do full dynamic testing of capacitors that place full rated voltage across them and check for value, leakage, and ESR (resistance). Door switches get a great deal of hard use. Testing a PTC thermistor follows all the same steps as a NTC thermistor. If you read 240V here, tested with a volt meter, unplug dryer and test components with ohm meter. This step will require a volt-ohm tester. If the shaft turns freely, set the multimeter to its ohms function. First check, with an ohmmeter, the thermistor without any heat applied. Ohms is the measure of electrical resistance, the higher the number, the greater the resistance. How to Test a Dryer Door Switch With an Ohmmeter. While most of today's dryers also feature auto shutoffs when the chamber air hits a certain temperature, they still require the use of a timer motor to operate. Analog or digital, it doesn't matter. With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. Should show continuity. Place the ohm meter leads across 2M and 1M and then manually pushing the black disc on the inner portion of the motor shaft towards the centrifugal switch. 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