Troubleshooting Tests - Whirlpool Washer Service Manual

FOR SERVICE TECHNICIAN'S USE ONLY

TROUBLESHOOTING TESTS

IMPORTANT: The following procedures
may require the use of needle probes
to measure voltage. Failure to use needle
probes will damage the connectors.
TEST #1: CCU Power Check
This test is used to determine if power is
present at the machine control electronics.
This test assumes that proper voltage is
present at the outlet.
1. Unplug dryer or disconnect power.
2. Check for appropriate line voltages at the
outlet: 240VAC (electric 2-phase), 208VAC
(electric 3-phase), or 120VAC (gas).
 If line voltage is present, go to step 3.
 If line voltage is not present, check for
tripped circuit breaker or blown household
fuse. If CB (circuit breaker) is not tripped,
have customer check with qualified
electrician.
3. Remove top panel to access the machine
electronics.
4. Plug in dryer or reconnect power.
P2 – WIDE TO UI (+5 VDC)
P2-1 BLK +5VDC
P2-2 BLU DATA
P2-3 YEL 5V GND
P8 – MYST VALVE/DOOR SWITCH
P8-5 OPEN
P8-4 TAN DOOR SWITCH
P8-3 WHT NEUTRAL
P8-2 G/Y CHASSIS GND
P8-1 RED MYST VALVE
Heater Relay #1
(Gas & Elect.)
L1 – BLK
Heater (E) – VLT
Heater (G) – RED
Heater Relay #2
(Elect. Only)
L1 – BLK
Heater – VLT
DO NOT REMOVE OR
P5 – +12VDC
P5-1
P5-2
P5-3 12V GND
P5-4
P5-5
P5-6
P5-7
P5-8 +12VDC
P14-3 RED OUTLET THERMISTOR
P14-2 RED INLET THERMISTOR
P14-1 RED INLET THERMISTOR
P9
K2
K1
K3
P8
Figure 11 - CCU Connectors & Pinouts
DESTROY
5. CCU VAC – With voltmeter set to AC,
connect black probe to CCU P8-3 (N) and
red probe to P9-2 (L1). (See Figure 11.)
 If 120VAC is present, go to step 6.
 If 120VAC is not present, perform TEST
#2: Supply Connections, page 10.
6. CCU +5VDC – With voltmeter set to DC,
connect black probe to CCU P2-3 (ground)
and red probe to P2-1 (+5V DC).
 If +5VDC is present, go to step 9.
 If +5VDC is not present, go to step 7.
7. Unplug dryer or disconnect power. Unplug
P14 from the CCU. Plug in dryer or reconnect
power and repeat step 6.
 If +5VDC returns, one of the thermistors
has shorted. To diagnose thermistors,
see TEST #4a, page 16.
 If +5VDC is not present, go to step 8.
8. Unplug dryer or disconnect power.
Reconnect P14 to the CCU and unplug P2 from
the CCU. Plug in dryer or reconnect power and
repeat step 6. Perform voltage check inside
header P2 on CCU, between pins 1 & 3—DO
NOT SHORT PINS TOGETHER.
P9 – MOTOR/L1
P9-2
P9-1
P13 – MOISTURE SENSOR
P13-2 RED
P13-1 BLK
P14 – THERMISTORS
P14-6 RED
P14-5 RED
P14-4 RED
Motor Relay
BLK L1
LT BLU MOTOR
MOISTURE SENSOR
MOISTURE SENSOR
OUTLET THERMISTOR
MODEL RTN (GAS MODEL)
MODEL (GAS MODEL)
P13
P5
P2
•
= pin-1
P14
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