Maytag MEDB750YW0 Troubleshooting Guide download pdf (Page 18)

PAGE 18

FOR SERVICE TECHNICIAN’S USE ONLY

DO NOT REMOVE OR DESTROY

10. Unplug dryer or disconnect power.

11. Reassemble all parts and panels.

12. Plug in dryer or reconnect power.

13. Perform steps under “Install Diagnostics”,

page 5, to verify repair.

TEST #5: Moisture Sensor

This test is performed when an automatic cycle

stops too soon, or runs much longer than expected.

NOTE: Dryer will shut down automatically

after 2½ hours.

The following items are part of this system:

1. Activate the Service Diagnostic Mode and

then select the User Interface/Control System

Test. See procedures on page 4.

2. Open the door. Using a wet cloth or one

ﬁnger, jointly touch both sensor strips.

If a repeating beep tone is heard and an

alphanumeric number is displayed on the

console, the moisture sensor passes the

test. Go to step 9.

If a beep tone is not heard, or a repeating

beep tone is heard before touching both

moisture strips, continue with step 3.

NOTE: Overdrying may be caused by a short

circuit in the sensor system.

3. Unplug dryer or disconnect power.

4. Remove console to access the CCU

and User Interface (UI).

5. Access the moisture sensor wires by

removing the front panel. Disconnect the

3-wire moisture sensor connector (see

Figure 14).

6. Access the CCU and remove connector

P13 from the circuit board. Check the wire

harness for continuity between P13 and the

moisture sensor connector.

If there is continuity, go to step 7.

If there is no continuity, or if a short is

detected, replace the main harness.

7. Measure the resistance

across the outermost

contacts of the connector

that includes the two MOVs.

If any resistance is measured, clean the two

metal moisture strips inside the drum. If

any resistance is measured after cleaning,

replace the sensor harness.

If the reading is open, continue to step 8.

8. Measure the resistance

across each of the outermost

contacts and the center

terminal (ground connection).

If a resistance less than inﬁnity is

measured, replace the sensor harness.

9. If the moisture sensor diagnostic test

passes, check the outlet thermistor: TEST #4a,

page 15.

If the problem persists after replacing the

moisture sensor and thermistor, consider

adjusting the dryness level (see TEST #5a:

Adjusting Customer-Focused Dryness Level,

page 19).

10. If the preceding steps did not correct the

problem, replace the CCU.

Part of Moisture System

Electric

Dryer

Gas

Dryer

Harness/connection

��

Metal sensor strips

��

Machine control electronics

��

Figure 14 - Disconnect sensor connector.

Sensor

Lint Screen

Housing

Sensor Harness

with MOVs

(Metal Oxide

Varistors)

Sensor

Connector

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