Wiktor Wise
Testing an electric dryer thermometer is a simple process that can help diagnose heating problems. Before you begin, it is important to prioritise safety by wearing protective goggles and gloves, and ensuring the dryer is unplugged from its power source to avoid electrical shock. The thermistor, which is responsible for monitoring and regulating the temperature inside your dryer, is usually located near the blower housing or exhaust vent. It can be identified as a small flat plate with two wires attached. Once located, use a multimeter to test the thermostat's resistance. If you have a manual multimeter, set it to 20K ohms to test resistance, whereas an automatic multimeter will auto-detect the proper range. A working thermistor will show a resistance within its specified range.
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What You'll Learn
Always unplug the dryer to avoid electrical shock
It is imperative to unplug the dryer to avoid electrical shock. Dryers and other electric household appliances are not designed to shock their users. However, if you are experiencing shocks when touching the dryer, it indicates an electrical insulation breakdown within the machine, made evident by a faulty ground connection. This issue can be hazardous, as a slight tingle of shock can unexpectedly transform into a potent jolt capable of inflicting harm or even proving fatal.
To prevent electrical shock, always disconnect the dryer from its power source before performing any tests or maintenance. This can be achieved by unplugging the appliance from the wall or switching off the circuit breaker. By cutting off the power supply, you eliminate the risk of coming into contact with live electrical components.
Additionally, it is recommended to test your dryer's thermostat at room temperature. This can be done by detaching the thermostat wires, which are typically two in number, and measuring the ohms using a multimeter. A reading of 0 or near 0 indicates normal functionality, while a reading of infinity suggests the need for a thermostat replacement.
When working with electrical equipment, always prioritize safety. If you are uncomfortable or unfamiliar with the procedures, it is best to consult a professional. Electric dryers can operate on both 120 and 240 volts, and improper handling can lead to dangerous situations. Always ensure that your dryer is properly grounded to prevent electrical faults and potential shocks.
In summary, always unplug the dryer or turn off the circuit breaker to avoid electrical shock. By doing so, you can safely perform tests and maintenance on your dryer without risking injury or accidental electrocution. Remember to consult a professional if you have any doubts or concerns about the procedure.
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Use a screwdriver to remove the back panel
Before you begin testing your electric dryer's thermometer, it is important to take safety precautions. Always unplug the dryer before starting to avoid electrical shock. Additionally, wear protective gear such as gloves and safety glasses to shield yourself from any loose parts or sharp edges. Ensure that you are working in a dry environment as water and electricity can result in a serious shock.
Now, let's get into the steps for removing the back panel of your electric dryer with a screwdriver:
First, locate the rear access panel of your dryer. This is usually found at the back of the appliance. Using a screwdriver, typically a Phillips or flat-head screwdriver, remove the metal screws holding the back panel in place. There may be multiple screws, so take your time and be careful not to strip the screws or scratch the dryer's surface. Place the removed screws in a safe place so you can easily access them when it's time to reassemble the dryer. Once all the screws are removed, gently lift or slide the back panel off. Set it aside, being mindful of any wires or components that may be attached.
Locate the thermostat:
With the back panel removed, you will have access to the internal components of your dryer. The thermostat is typically located near the blower housing or exhaust vent. It is often positioned to allow for easy access and troubleshooting. Refer to your dryer's manual or an electrical diagram if needed.
Detach the thermostat wires:
Before testing the thermostat, you will need to detach its wires. Label each wire to ensure proper reconnection later. The dryer thermostat typically has two wires connecting it to the heating element. Identify the metal slip connector attached to the wires and gently pull them out using needle-nose pliers if necessary.
Test the thermostat:
Use a multimeter to test the thermostat's resistance. Set the multimeter to the RX1 setting or 20K ohms if it's a manual one. Automatic multimeters will auto-detect the proper range. Place each of the meter's probes onto the wire terminals. A reading of 0 or close to 0 indicates good continuity and a functional thermostat. If the reading is significantly different, your thermostat may need replacement.
Remember, if you feel uncomfortable or unsure at any point during this process, it is best to consult a professional technician. They can accurately diagnose and fix any issues, ensuring your dryer operates safely and efficiently.
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Locate the thermistor—a small flat plate with two wires
Before attempting to locate the thermistor, it is important to unplug your dryer to prevent electric shock. The thermistor is a small flat plate with two wires attached and is usually found in the vent opening or exhaust outlet. To better access the component, you might need to remove the bottom cover panel of your dryer.
The thermistor is typically made of metallic oxides, pressed into a bead, disk, or cylindrical shape, and then encapsulated with an impermeable material such as epoxy or glass. It is a solid-state temperature-sensing device that acts like an electrical resistor but is temperature-sensitive. The thermistor measures the temperature of the air in the dryer, ensuring that clothes dry effectively while preventing the dryer from overheating.
To locate the thermistor, you can refer to the dryer's manual or a diagram to confirm its exact location, as it may vary depending on the specific dryer model. Once you have identified the thermistor, you can proceed with testing it by disconnecting its wires and using an ohm multimeter testing device to record a resistance reading.
It is important to note that the thermistor should not be detached from the dryer during the testing process. Additionally, at room temperature, a standard thermistor should read approximately 100k ohms, and if it deviates significantly from this value, it may be defective and require replacement.
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Use a multimeter to test the thermostat's resistance
To test a thermostat with a multimeter, you will first need to turn off the electrical power to your dryer. Unplug the appliance from the wall or cut the circuit at the main fuse or breaker box. Then, access the dryer's rear panel by removing the metal screws with a Phillips screwdriver. Locate the thermostat and detach the thermostat wires. Label each wire before removal so you know how to reconnect them.
Now, take your multimeter. If it is analogue, you will need to calibrate it by holding the probes together and adjusting the needle to read zero. If it is digital, you will not need to calibrate it, but you will need to rotate the range selection dial to the lowest setting for Ohms of resistance or 'resistance with tone'.
To test the thermostat's resistance, set the multimeter to the RX1 setting and place each of the meter's probes onto the wire terminals. You should receive a reading of 0. A reading of 0, or close to 0, means that the electrical flow is good. If the meter does not indicate 0 but reads infinity, your thermostat should be replaced.
If you are using an electric griddle or skillet, you can hold the two multimeter probes against the outer terminals as the appliance heats up to the designated temperature. If the cycling thermostat switches off, or displays no electrical continuity, within 5% of the temperature, the part is functioning properly. If the thermostat does not switch off, or switches off prematurely, it is likely defective and will need to be replaced.
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A reading of 0 means the electrical flow is good
If you are experiencing problems with your electric dryer, such as slow dry times or overheating, you should check if the thermistor is working properly. The thermistor is a heat sensor that monitors the air temperature inside the drum to ensure that clothes dry effectively and the dryer does not overheat.
To test the thermistor, first unplug your dryer to prevent electric shock. Then, locate the thermistor, which is usually found in the vent opening or exhaust outlet. It is a flat metal or plastic plate with two wires attached. You don't need to detach it from the dryer, just disconnect its wires.
Now, hook up an ohm multimeter testing device to the thermistor. The testing device should immediately record a resistance reading. A reading of 0 means the electrical flow is good. If the reading is lower than expected or no reading is detected at all, the thermistor is likely defective and should be replaced. At room temperature, the thermistor should read approximately 50,000 to 100,000 ohms.
If your thermistor readings are normal, you can move on to troubleshooting other parts of the dryer, such as the timer, thermal fuses, motor, or heating elements.
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Frequently asked questions
If your clothes are still damp after a drying cycle or if your dryer is not shutting off at the timer, your thermostat may be faulty. To check, turn off the electrical power to your dryer and test your thermostat at room temperature. If the thermostat reading is normal, you will need to troubleshoot the dryer's timer, thermal fuses, motor, or heating elements.
The dryer thermostat will have two wires connecting it to the heating element. Label each wire before removal so you know how to reconnect them. Measure the thermostat's ohms—the unit of electrical flow. Use a multimeter to test the thermostat's resistance by setting it to the RX1 setting. If the meter does not indicate 0 but reads infinity, your thermostat should be replaced.
The thermistor is responsible for monitoring the temperature inside your dryer and sending signals to the control board. It is usually located near the blower housing or exhaust vent. To access it, you will need a screwdriver to remove the back panel of the dryer. Once you've removed the panel, you will see a small flat plate with two wires attached to it. Grab your multimeter and check the resistance reading. A working thermistor will show a resistance within its specified range.
