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Fujitsu ASU18CL Thermistor
A very basic thermistor is a specific kind of resistor that has a fluctuating resistance that is directly proportioned to heat. They can tell the circuit board when the temperature in increasing or decreasing. The heating system takes the temperature in a few critical areas to understand what is going on.
General indicators that your your all-important thermister needs replacing
- The entire system may not even start depending on which is the thermistor that is stuck open
- Blower motor refuses in the attempt to engage full speed
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