5-4
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
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 of f,
the thermistor, or the wire harness, is ei-
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.
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.
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.
TEMP RESISTANCE TEMP
R
ESISTANC
E
°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°)9.260
° (140°)2.5
32° (90°)7.466
° (150° ) 2.1
38°(100° )5.771
° (160°
)
1.7
THERMISTOR RESISTA NCE
TEMPERATURE HEAT TU RN S HEAT TU RN S
SETTING OFF ON
68° C ±6°
(155° F ±10°) 6 - 8°C
60° C ±6° (10 - 15°F)
(140° F ±10°)
b
elow the hea
t
52° C ±6° turn off
(125° F ±10°) temperature
EXTRA 41° C ±3°
LOW (105° F ±5°)
HIGH
MEDIUM
LOW