Temperature Sensor Testing - Maytag MXR65 Service Manual

Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
The temperature sensor cable is connected at
the upper right hand side of the control board
on a 3 pin connector labeled "J_T1" and it is
wire-tied along the cabinet with the rest of the
wire harness until it reaches the bottom right
rear of the outer tub, where it is inserted and
held in place by compression.
The 3 pins on the T1 connection of the washer
control board are as indicated below:
Left pin: White wire = Negative (-)
Middle pin: Black wire = Shielded wire
Right pin: Brown wire = Positive (+)
The Thermistor within the sensor is connected
across the left pin (negative) and the right
pin (positive). Measuring at the control board
"T1" with the sensor connector disconnected,
the normal DC voltage measured from left pin
to right pin = approximately 5 volts

TeMPeRaTuRe SeNSOR TeSTiNG

Thermistor
Connector
Electrical Shock Hazard
quiCk TeST:
1. Unplug washer or disconnect power.
2. Disconnect the Temperature Sensor from
"T1" on the control board.
3. Check in Status Screen for temperature
reading. Temperature reading in the display
should be 255°F.
4. Short the left pin and the right pin together.
5. Check in Status Screen for temperature
reading. Temperature reading in the display
should be 34°F.
6. Check resistance across Negative (-) and
Positive (+) terminals. Resistance readings
at various temperature levels are shown
below. An open circuit (infinite Ω) reading or
a reading of 20% difference higher or lower
is cause to replace the thermistor.
Degree F: (C)
50 (10)
70 (21.1)
90 (32.2)
110 (43.3)
130 (54.4)
150 (65.6)
170 (76.7)
4-14
Ohms:
880
955
1055
1145
1245
1340
1440