Are all refrigerator thermistors the same?
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Are all refrigerator thermistors the same?
All thermistors have the same part number no matter where they’re located. It’s important to note that they’re not called thermistors on all of the models. Sometimes they’re also called a temperature sensor or refrigerator evaporator sensor.
How do you read the thermistor value?
A thermistor does not actually “read” anything, instead the resistance of a thermistor changes with temperature. How much the resistance changes depends on the type of material used in the thermistor.
Do thermistors go bad?
Thermistor Failure Symptoms The most common way to know if a thermistor is bad if it starts displaying inaccurate temperature readings. This can be caused by excessive heat, improper handling, a thermal mismatch, or a dip in resistance accuracy due to regular use and age.
How is a thermistor diagnosed?
Heat the soldering iron. Heat the thermistor by moving your heated soldering iron tip to it. Note the multimeter reading as you are applying this heat. A properly functioning positive temperature coefficient thermistor will show a smooth and steady increase in the multimeter resistance reading.
What do the numbers on a thermistor mean?
Thermistor manufacturers supply the three coefficients, A, B and C, for each thermistor type, so users can calculate a temperature in units of Kelvins based on a resistance measurement. If you must make high-accuracy measurements, you can fine tune the three Steinhart-Hart coefficients for your specific thermistor.
How do you diagnose a bad thermistor?
The most common way to know if a thermistor is bad if it starts displaying inaccurate temperature readings. This can be caused by excessive heat, improper handling, a thermal mismatch, or a dip in resistance accuracy due to regular use and age.
How do I know if a thermistor is bad?
The most common way to know if a thermistor is bad if it starts displaying inaccurate temperature readings. This can be caused by excessive heat, improper handling, a thermal mismatch, or a dip in resistance accuracy due to regular use and age. An open circuit can also lead to thermistor issues.
How do you find the resistance of a thermistor?
Thermistors are available in two types: those with Negative Temperature Coefficients (NTC thermistors) and those with Positive Temperature Coefficients (PTC thermistors). NTC thermistors’ resistance decreases as their temperature increases, while PTC thermistors’ resistance increases as their temperature increases.
What causes a thermistor to fail?
The cause of such failures are usually due to mechanical separation between the resistor element and the lead material, caused by handling damage, excessive heat, thermal mismatch, etc. The second most common failure mode is drift in resistance value as the thermistor ages, or parameter change.
