Whirlpool WED7400XW0 Troubleshooting Guide download pdf (Page 4)

W10301482B .ON TRAPYLNO ESU S’NAICINHCET ECIVRES ROF

TECH SHEET - DO NOT DISCARD PAGE 4

TEST #2 Machine Control Power Check

This test is used to determine if power is present at

the machine control electronics.

NOTE: The drum light is controlled by the machine

control on all models.

1. Plug in dryer or reconnect power.

2. Open the door.

➔

If the drum light illuminates, then power is

present at the machine control. Go to

TEST #6, page 8.

➔ If the drum light fails to illuminate, do not

assume the machine control electronics needs

replacement. Several conditions may cause

the drum light not to illuminate, including a bad

bulb. If the drum light does not illuminate, go

to TEST #1, at left.

TEST #3 Drive Motor Circuit

This test will check the wiring to the motor and the

motor itself. The following items are part of this

motor system:

– Harness/

connection

– Thermal fuse

– Belt/belt switch

– Drive motor

– Centrifugal switch

– Door switch

– Machine control

electronics. See ESD

information, page 1.

1. Unplug dryer or disconnect power.

2. Access the machine control electronics and

measure the resistance across P8-4 and P9-1.

See Accessing & Removing the Electronic

Assemblies, page 9.

➔ If resistance across P8-4 and P9-1 is in the

range of 1 to 6 Ω, replace the machine control

electronics.

➔ Otherwise, go to step 3.

3. Check the wiring and components in the path

between these measurement points by referring

to the appropriate wiring diagram. See pages 11

and 12.

4. Perform TEST #4b, page 7. If thermal fuse is OK,

continue with step 5.

5. Check the belt switch and drive motor. Access the

belt switch and drive motor by removing the back

panel. See Removing the Back Panel, page 10.

Slowly remove the drum belt from the

spring-loaded belt switch tension pulley, gently

letting the pulley down. See figure 5.

Door

Switch

See Removing the Front Panel/Drum Assembly,

page 9, to access:

■

Exhaust

Moisture Sensors

Thermistor

Thermal Cut-off

Inlet Thermistor/

High Limit Thermostat

Heater

Assembly

See Accessing & Removing the Electronic Assemblies,

page 9, to access:

■

Machine Control Electronics

User Interface Assembly

Moisture

Sensor

Strips

■

Heater

Thermal Fuse

Assembly

See Removing the

Back Panel, page 10,

to access:

■

Drum Light Assy.

Water Nozzle

(Steam Model)

Water Valve Assy.

(Steam Model)

Drive Motor

Belt Switch

Figure 2. Component locations.

TROUBLESHOOTING TESTS

NOTE: These checks are done with the dryer

unplugged or disconnected from power.

TEST #1 Supply Connections

This test should only be done after confirming proper

voltage at the outlet.

1. Unplug dryer or disconnect power.

2. Remove the cover plate from the back of the

dryer. See figure 3.

3. Make sure the power cord is securely fastened

to the terminal block.

4. With an ohmmeter, check for continuity between

the neutral (N) terminal of the plug and the center

contact on the terminal block. See figure 4.

➔ If there is no continuity, replace the power cord

and test the dryer.

➔ If there is continuity, go to step 5.

5. In a similar way, check which terminal of the plug

is connected to the left-most contact on the

terminal block and make a note of it. This will be

L1 (black wire) in the wiring diagram. See figure 4

above and the appropriate wiring diagram. See

pages 11 and 12.

➔ When this is found, go to step 6.

➔ If neither of the plug terminals have continuity

with the left-most contact of the terminal

block, replace the power cord and test the

dryer.

6. Access the machine control electronics without

disconnecting any wiring to the control board.

See Accessing & Removing the Electronic

Assemblies, page 9.

7. With an ohmmeter, check for continuity between

the L1 terminal of the plug (found in step 5) and

P9-2 (black wire) on the machine control board.

See figure 16, page 9.

➔ If there is continuity, go to step 8.

➔ If there is no continuity, check that wires to the

terminal block are mechanically secure. If so,

replace the main wire harness and test the dryer.

8. Check for continuity between the neutral (N)

terminal of the plug and P8-3 (white wire) on the

machine control board.

➔ If there is continuity, go to step 9.

➔ If there is no continuity and the mechanical

connections of the wire are secure, replace the

main wire harness.

9. Visually check that the P5 connector is inserted

all the way into the machine control electronics.

10. Visually check that the user interface assembly

is properly inserted into the front console.

11. If both visual checks pass, replace the user

interface assembly.

13. Plug in dryer or reconnect power.

14. Perform the Console Buttons and Indicators

Diagnostic test, page 1, to verify repair.

15. If indicators still do not light, the machine control

electronics has failed:

➔ Unplug dryer or disconnect power.

➔

Replace the machine control electronics.

➔

Plug in dryer or reconnect power.

➔

Perform the Console Buttons and Indicators

Diagnostic test, page 1 to verify repair.

Remove Screw

Cover

Plate

Figure 3. Remove the cover plate.

COM

Power Cord

Plug

Terminal Block

Figure 4. Plug-to-terminal connections.

Drum

Belt

Tension

Pulley

Figure 5. Slowly remove drum belt.

12. Replace all parts and panels.

➔

Replace all parts and panels.

1 2 3 4 5 6 7 8 9 10 11 12

Comments to this Manuals

No comments

Whirlpool WED7400XW0 Troubleshooting Guide Page 4

Comments to this Manuals

Related products and manuals for Electric laundry dryers Whirlpool WED7400XW0