COMPONENT TESTING
Whirlpool Compact Heat Pump Dryer
n
3-19
For Service Technician Use Only
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Failure to do so can result in death or
electrical shock.
Replace all parts and panels before operating.
TEST #11 Heater Exchanger (HX)
Filter Switch
This is a test to perform when the icon “Bottom filter is
blocked” lights and does not allow the start of a cycle.
1. Open the cover to access the bottom filter.
2. Verify that the release levers are in place and in good
condition to hold the bottom filter in place.
3. Remove the filter and make sure that it is not blocked by
lint.
4. Put the filter back in place and make sure that the release
levers are securely holding it.
5. If the icon is still lit, remove the top panel and console
to access the machine electronics. Remove the left side
panel to access the reed switch.
6. Verify continuity between J8-1 and J8-2: when the filter is
removed, there should be high resistance (open contact);
when the filter is in place, there should be low resistance
(closed contact). If not, replace the harness.
NOTE:
The harness includes the reed switch and the water
level switch.
7. If the failure persists after replacing the harness, replace
the ACU.
HEATER EXCHANGE FILTER SWITCH STRIP CIRCUIT
Figure 2 - Heater Exchange Switch Strip Circuit
ACU
HEATER EXCHANGE SWITCH
J8-2
W
HEATER EXCHANGE SWITCH
BK
ACU
J8-1
BK
W
CONNECTOR LOCATION (ACU TOP)
Figure 1 - Heater Exchange Filter Switch Connector (HX)
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
