Thermistor Converter
Meter on the sensor, reading in, temperature out. Compare it with the real temperature at the sensor and you know in ten seconds whether it's lying.
Which make?
Pick the badge on the unit — then the sensor by the name on the wiring diagram.
Measure resistance with the sensor disconnected from the board — in circuit, the board reads in parallel. (Fujitsu's volts column is the in-circuit reading.)
Open the full diagnosis →