Maytag MEDB750YW0 Troubleshooting Guide download pdf (Page 16)

PAGE 16

FOR SERVICE TECHNICIAN’S USE ONLY

DO NOT REMOVE OR DESTROY

If the resistance is OK, the outlet thermistor

is good. Proceed to step 4.

If the thermistor resistance does not agree

with the table, replace the outlet thermistor.

4. Check P4/P14-3 and P4/P14-6 to

dryer cabinet ground. If either pin indicates

continuity to ground (short), replace wiring

harness; otherwise, proceed to step 5.

5. If the preceding steps did not correct the

problem, replace the CCU.

Temperature Levels Incorrect – If no error code

is displayed and the connections to the thermistor

are good, check the exhaust temperature value

at any or all of the temperature levels in question,

using the “timed dry” cycle.

1. Remove load from dryer and disconnect

external vent.

2. Plug in dryer or reconnect power.

3. Run a “timed dry” cycle of at least 5

minutes in duration. Select high, medium,

low, or extra low.

4. Using a calibrated temperature probe,

take a temperature measurement in the center

of the exhaust outlet. The correct exhaust

temperatures are as follows:

If the temperature is not reached within

~7 minutes, check voltage level and vent

blockage, and then retest.

If the temperature probe does not agree

with temperature setting, replace the outlet

thermistor.

If the temperature probe conﬁrms the

temperature setting, retest at a different

temperature setting.

TEMPERAT URE

SETTING

HEAT TURNS OFF*

°F (°C)

HEAT TURNS ON

°F (°C)

High 155° ± 5° (68° ± 3°)

Medium 140° ± 5° (60° ± 3°)

Low 125° ± 5° (52° ± 3°)

Extra Low 105° ± 5° (41° ± 3°)

EXHAUST TEMPERAT URES

10–15° (6–8°)

below the

heat turn off

temperature

5. If the preceding steps did not correct the

problem, replace the CCU.

Inlet Thermistor

NOTE: On the electric dryer, the inlet thermistor

is part of the high thermostat assembly (see

Figure 12a, page 14). On the gas dryer, the

inlet thermistor is located at the top of the drum

inlet vent (see Figure 17, page 23).

The CCU monitors the inlet temperature using

the inlet thermistor. The inlet thermistor (along

with the outlet thermistor) is used to detect air

ﬂow, and assists in calculating load size.

1. Unplug dryer or disconnect power.

2. Remove console to access the CCU and

User Interface (UI).

3. Remove connector P4/P14 from the CCU

and measure the resistance between P4/P14-1

and P4/P14-2 at the connector. The following

tables (electric & gas) give temperatures and

the associated resistance values.

NOTE: All thermistor resistance measurements

must be made while dryer is unplugged and

connector removed from CCU.

If the resistance is OK, the inlet thermistor

is good. Proceed to step 4.

If the thermistor resistance does not agree

with the table, replace the inlet thermistor.

TEMP.

°F (°C)

RES.

RANGE

k ohms

TEMP.

°F (°C)

RES.

RANGE

k ohms

68° (20°) 61.2–63.7 131° (55°) 14.5–15.3

77° (25°) 49.0–51.0 140° (60°) 12.1–12.8

86° (30°) 39.5–41.1 149° (65°) 10.2–10.7

95° (35°) 32.0–33.3 158° (70°)8.5–9.0

104° (40°) 26.1–27.2 167° (75°)7.2–7.6

113° (45°) 21.4–22.3 176° (80°)6.1–6.5

122° (50°) 17.6–18.5

ELECT - INLET THERMISTOR RESISTANCE

TEMP.

°F (°C)

RES.

RANGE

k ohms

TEMP.

°F (°C)

RES.

RANGE

k ohms

68° (20°) 57.5–67.6 131° (55°) 14.1–15.6

77° (25°) 46.1–53.8 140° (60°)11.8–12.9

86° (30°) 37.4–43.1 149° (65°)9.9–10.8

95° (35°) 30.4–34.7 158° (70°)8.4–9.0

104° (40°) 24.9–28.2 167° (75°)7.1–7.6

113° (45°) 20.5–23.0 176° (80°)6.0–6.4

122° (50°) 16.9–18.9

GAS - INLET THERMISTOR RESISTANCE

TEMP.

°F (°C)

RES.

RANGE

k ohms

TEMP.

°F (°C)

RES.

RANGE

k ohms

50° (10°) 19.0–22.0 80° (27°)8.5–10.5

60° (16°) 14.8–16.8 90° (32°)6.8–8.8

70° (21°)11.5–13.5 100° (38°)5.0–7.0

OUTLET THERMISTOR RESISTANCE

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 51 52

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