150 Part Number: 000015431 Rev01 5/19
SYMPTOM
The alert log indicates a T1, T2, T3, or T4 Fault.
CHECK PROCEDURE
NOTE: Navigate to Menu/Service/Data/Real Time data/
Time & Temperature
NOTE: An open thermistor will display -10°F (-23°C) and a
shorted thermistor displays 400°F (204°C).
Thermistor Test
1. Disconnect the suspect thermistor from the control
board and swap with another thermistor.
A. The symptoms move with the thermistor -
Replace the thermistor.
B. The symptom does not change - Perform control
board test.
Control Board Test
1. Disconnect thermistor from control board - The
display temperature reading, dropping to -10°F
(-23°C) indicates the control board is good.
2. Short thermistor pins - The display temperature
reading, climbing to 400°F (204°C) indicates the
control board is good.
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