Customer Questions and Answers for Thermistor by Whirlpool

Hello Rebecca. You need to check the control board WPW10256719 and see if it is bad and not sending power to the heater. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

Tom, The E1 error code is a thermistor open error. The things that you will want to check is the following: The machine control electronics monitors the exhaust temperature using the thermistor, and cycles the heater relay on and off to maintain the desired temperature. Begin with an empty dryer and a clean lint screen. 1. Plug in dryer or reconnect power. 2. Set the following configuration: ? Door – must be firmly closed ? Press CONTROL ON ? Press CYCLE END SIGNAL [Loud] ? Press HOLD TO START 3. If after 60 seconds, E1 or E2 flashes in the display and the dryer shuts off, the thermistor or wire harness is either shorted or open. ? Unplug dryer or disconnect power. ? Check wire connections at the machine control electronics and thermistor. See Accessing the Machine Control Electronics Assembly, page 13, and figure 9 for thermistor location. ? If wire connections are good, remove the two wires from the thermistor and replace the thermistor. See figure 9. ? Plug in dryer or reconnect power 4. If E1 or E2 does not flash in the display, the connections to the thermistor are good. Therefore, check the thermistor’s resistance value at any or all of the temperature levels in question, using the Timed Dry Cycle, and the following process: Hold a glass bulb thermometer capable of reading from 32° to 82°C (90° to 180°F) in the center of the exhaust outlet. The table at the top of the page shows correct exhaust temperatures. 5. If the exhaust temperature is not within specified limits, check the resistance of the thermistor. NOTE: All thermistor resistance measurements must be made while dryer is unplugged or disconnected from power. The top table also gives the resistance values that should be observed for the various temperature settings. If needed, the table at right gives temperatures and their associated resistance values. ? If the thermistor resistance checks within normal limits, replace the machine control electronics. Thermistor resistance chart, Temp resistance 50 19.9K 60 15.3K 70 11.9K 80 9.2K 90 7.4k 100 5.7k

Hello Bryan. With a thermistor, it does not matter which wire goes where.

John, When testing the thermistor, you will want to check at room temperature which at 77 degrees should be around 49k to 51K ohms on the inlet thermistor and 8.5k to 10.5k ohms on the exhaust thermistor. When the unit is running an you test the thermistor the resistance should go down. If the resistance is rising then the issue would be with the thermistor.

Ramona, The first thing to check is the thermal fuse and door switch on the dryer. You will test both for continuity. If there is no continuity then the part is bad and would need to be replaced.

Michael, The F22 error code is showing that the Outlet thermistor is reading open. The 2 red wires would most likely go to the outlet thermistor with the issue that you are having. But you will want to do the following checks if the wire get reconnected and there is still a problem. TEST #4a Thermistors Outlet Thermistor The machine control electronics monitors the exhaust temperature using the outlet thermistor, and cycles the heater relay on and off to maintain the desired temperature. Begin with an empty dryer and a clean lint screen. 1. Plug in dryer or reconnect power. 2. Start the Timed Dry cycle. 3. If after 60 seconds, or flashes in the display and the dryer shuts off, the thermistor or wire harness is either open or shorted. Unplug dryer or disconnect power. Check wire connections at the machine control electronics and thermistor. See Accessing & Removing the Electronic Assemblies, page 9, and for thermistor location, see figure 11, page 6. If wire connections are OK, check the outlet thermistor resistance per step 5. 4. If or does not flash in the display, the connections to the thermistor are good. Therefore, check the exhaust temperature value at any or all of the temperature levels in question, using the Timed Dry cycle, and the following process: Hold a glass bulb thermometer capable of reading from 90° to 180°F (32° to 82°C) in the center of the exhaust outlet. The correct exhaust temperatures are as follows: On high the heat turns off at 155 degrees Fahrenheit +/-5 degrees, on medium high it turns off at 150 degrees, medium 140 degrees low 125 degrees extra low at 105 degrees. All of these are +/- 5 degrees and on all settings the heat turns back on 10 -15 degrees below the heat turn off temp. *The measured overshoot using the glass bulb thermometer in the exhaust outlet can be 30°F (17°C) higher. 5. If the exhaust temperature is not within specified limits, or you have come here from step 3, perform the following: NOTE: All thermistor resistance measurements must be made while dryer is unplugged or disconnected from power. ELECTRIC DRYER: Remove the P4 connector, then measure the resistance between P4-3 (red wire) and P4-6 (red wire) at the connector. If the resistance is OK, check P4-3 and P4-6 to dryer ground. If resistance is greater than 0 (zero), replace wiring harness. If the resistance is OK, check P14-3 and P14-6 to dryer ground. If resistance is greater than 0 (zero), replace wiring harness. Outlet thermistor resistances are as follows. 50 degrees 19 - 22K ohms range, 60 degrees 14.8 - 16.8K ohms, 70 degrees 11.5 - 13.5K ohms, 80 degrees 8.5 -10.5K ohms, 90 degrees 6.8 - 8.8K ohms and 100 degrees 5 - 7K ohms. If the thermistor resistance does not agree with table, replace the outlet thermistor. If the thermistor resistance checks agree with the measurements in the table, replace the machine control electronics.

Hello Chris, It does not matter since this part is not polarized. The thermal fuse will only open from extreme temperatures.

Hello Chuck, If the unit fires up and operates normally but when the heat cycles off, the burner never re-lights, the issue is the coils 279834 or the gas valve WP8318281.

Hello Jose. Check for a bad terminal block and outlet. If good, replace the control board on the unit.

Hello Fred, This sounds like the control WPW10405846 may have an issue and the unit is cycling on the high limit thermostat.