COMPONENT TESTING
Whirlpool Compact Heat Pump Dryer
n
3-17
For Service Technician Use Only
TEST #9: Water Level Switch (SLE)
1. Verify visually that ACU connections J8-3 and J8-4 are
connected properly.
2. Verify 5 VDC voltage according to Test #1: ACU Power
Check, page 12.
3. Access the drain system cover by removing the left side
panel and the pump cover; verify if the float harness (line
to line connection) is connected. Check continuity in the
harness. If there are connectivity and continuity issues,
replace the harness and verify if the “water tank full”
indicator is off 60 seconds after pump activation (if there
is water inside) in Service Test Cycle step S04.
4. If the harness is OK, check water level switch status by
verifying the continuity in the terminals of the water level
switch connector. Tank full = switch open, tank empty =
switch closed. Fill the water tank manually to check the
switch status.
¾
If state does not change, replace the water level switch.
NOTE
: harness, water level switch, and reed switch
come together.
¾
If replacement of the water level switch does not solve
the problem, replace the ACU.
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
DRAIN PUMP / WATER LEVEL SWITCH STRIP CIRCUIT
L1
ACU
L2
P
DRAIN PUMP / WATER LEVEL SWITCH
J3-3
J13-2
BK
GY
R
GY
DRAIN PUMP
W
GY
J8-4
WATER LEVEL REED SWITCH
OR
ACU
J8-3
J3-1
J13-1
W
W
GY
TR1
210 OHMS
WATER LEVEL
WATER LEVEL
Figure 3 - Drain Pump / Water Level Switch Strip Circuit
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
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: ACU 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) or 208VAC
(electric 3-phase).
¾
If line voltage is present, go to step 3.
¾
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, left side panel, and
console to access the machine electronics.
4.
ACU VAC
– With voltmeter set to
AC
,
connect black probe to ACU J13-2 (L2) and
red probe to J13-1 (L1). (See Figure 2.)
Plug in dryer or reconnect power.
¾
If 240VAC is present, unplug dryer or
disconnect power and go to step 5.
¾
If 240VAC is not present, unplug dryer or
disconnect power and perform TEST #2:
Supply Connections, page 13.
5.
ACU +5VDC
– With voltmeter set to
DC
,
unplug connector
J17
from the ACU and
connect black probe to ACU J17-4 (ground)
and red probe to J17-2 (+5VDC). Plug in
dryer or reconnect power.
¾
If +5VDC is present, unplug dryer or
disconnect power and go to step 8.
¾
If +5VDC is not present, go to step 6.
6.
Unplug dryer or disconnect power. Unplug
J7
and
J6
from the ACU. Plug in dryer or
reconnect power and repeat step 5.
¾
If +5VDC returns, one of the thermistors
has shorted. To diagnose thermistors,
see TEST #4c, page 17.
¾
If +5VDC is not present, go to step 7.
7.
Unplug dryer or disconnect power.
Reconnect
J7
and
J6
to the ACU and unplug
J17
from the ACU. Plug in dryer or reconnect
power and repeat step 5. Perform voltage
check inside header J17 on ACU, between pins
2 & 4—DO NOT SHORT PINS TOGETHER.
Figure 2 - ACU Connectors
& Pinouts
IF – RFI
FM – Fan
M – Motor
supply
DP – Drain
pump
HE – Heater/
Compressor
M – Motor Supply
J4-1 L1 Motor
J4-2 L2 Motor
FM – Fan
J2-1 L1
J2-3 L2
DP – Drain Pump
J3-1 L1
J3-3 L2
WI2 – User Interface
J17-1 VPOS
J17-2 +5VDC
J17-3 WIDE
J17-4 GND
SEH – Moisture Sensor
J11-1 Gnd
J11-3 Moisture Sensor
IF – RFI
J13-1 L1
J13-2 L2
HE – Heater (Condenser dryer)/
Compressor (HP dryer)
Condenser dryer HP dryer
J5-1 L2
J5-1 L2
J5-2 Heater 1
J5-2 Compressor
J5-3 Heater 2
WI1 – MCU Communication
J12-2 +12VDC
J12-3 IN/OUT
J12-4 GND
HX-SLE – Heat
Exchanger Switch
and Level Switch
J8-1 Heat Ex 1
J8-2 Heat Ex 2
J8-3 Float 1
J8-4 Float 2
SET1 – NTC Air Channel
J7-1 NTC Air 1
J7-3 NTC Air 2
SET2 – NTC Heater
J6-1 NTC Heat 1
J6-3 NTC Heat 2
WI2 – User
interface
SEH
WI1 – MCU communication
HX-SLE
SET1 SET2
CONNECTOR LOCATION (Water Level Switch & Pump)
Figure 2- Drain Pump, Level Switch and Fan Access
Figure 1- Drain Pump (DP) & Water Level Switch Connectors (SLE)
Drain Pump
Water Level Sw.
Post Condenser
Auxiliary Fan