THERMISTOR

Refer to page 4-7 for the procedure for servic- ing the thermistor.

The thermistor monitors the exhaust temper- ature. The changes in thermistor resistance signals the electronics control, which cycles the high-limit thermostat on and off to maintain the desired temperature.

1. Turn the dryer off but keep the electrical

8.Hold a glass bulb thermometer capable of reading from 32°C to 82°C (90°F to 180°F) in the center of the exhaust outlet. Mea- sure the exhaust temperatures with the heater on and off. The correct exhaust tem- peratures for the various settings are shown in the following chart.

TEMPERATURE

HEAT TURNS

HEAT TURNS

 

 

 

 

 

SETTING

OFF

ON

 

 

 

 

 

 

supply connected.

2.

Make sure that the dryer is empty and that

 

the lint screen is clean.

3.

Close the dryer door.

4.

Select Heavy Duty, Timed Dry, + or ,

 

Cycle End Signal (Loud), and Start.

5.

If error codes E1 or E2 flash on the dis-

 

play after 1 minute and the dryer turns off,

 

the thermistor, or the wire harness, is ei-

HIGH

68° C ±6°

 

(155° F ±10°)

 

 

 

MEDIUM

60° C ±6°

 

(140° F ±10°)

 

 

 

LOW

52° C ±6°

 

(125° F ±10°)

 

 

 

EXTRA

41° C ±3°

 

 

LOW

(105° F ±5°)

 

 

6 - 8°C

(10 - 15°F)

below the heat

turn off

temperature

 

ther shorted or open. Check the wire con-

 

nections at the thermistor or the electronic

 

control board. If wiring checks okay, re-

 

place the thermistor.

6.

If the dryer seems to operate normally, re-

 

move the exhaust vent and start the dryer.

7.

Select the desired temperature cycle to be

 

tested, and select 20 minutes of Timed Dry

 

heat using the + or – pushbuttons.

9.If the exhaust temperature is not within the specified limits, check the resistance of the thermistor, as shown in the following chart. If the resistance is okay, replace the elec- tronic control board.

THERMISTOR RESISTANCE

TEMP

RESISTANCE

TEMP

RESISTANCE

 

 

 

 

 

 

°C (°F)

(K ohms )

°C (°F)

(K ohms )

 

 

 

 

 

 

 

 

 

 

 

10° (50°)

19.9

43° (110°)

4.7

 

 

 

 

 

 

16° (60°)

15.3

49° (120°)

3.7

 

 

 

 

 

 

21° (70°)

11.9

54° (130°)

3.1

 

 

 

 

 

 

27° (80°)

9.2

60° (140°)

2.5

 

 

 

 

 

 

32° (90°)

7.4

66° (150° )

2.1

 

 

 

 

 

 

38°(100° )

5.7

71° (160° )

1.7

 

 

 

 

 

 

5-4

Page 53
Image 53
Whirlpool MED / GD 9700S, MED / GD 9600S manual Thermistor