Whirlpool Cabrio Service Manual page 18

FOR SERVICE TECHNICIAN'S USE ONLY
8. If no open circuit is detected, remove the
P14 connector from the ACU and measure the
outlet thermistor resistance between P14-3
and P14-6 at the connector. Refer to "Outlet
Thermistor Resistance" table on page 19 for
temperatures and their associated values.
 If the resistance corresponds to the
temperature, the outlet thermistor is good.
Go to step 9.
 If the thermistor resistance does not agree
with the table, replace the outlet thermistor.
9. If the preceding steps did not correct the
problem and L1 and L2 were both detected,
replace the ACU. If L2 was not detected,
suspect the centrifugal switch before
replacing the ACU.
10. Reassemble all parts and panels.
11. Plug in dryer or reconnect power.
12. Perform steps under "Service Test Mode",
page 6, to verify repair.
GAS DRYER ONLY:
1. Verify the gas supply to the dryer is turned on.
2. Unplug dryer or disconnect power.
3. Perform TEST #4b: Thermal Fuse on page
20. If the thermal fuse is OK, go to step 4.
4. Perform TEST #4c: Thermal Cut-Off on
page 20. If the thermal cut-off is OK, go to
step 5.
5. Locate the high limit thermostat (see
figure 10b, page 17). Measure the continuity
through it by connecting the meter probes to
the red and black wire terminals.
 If there is an open circuit, replace both the
high limit thermostat and the thermal cut-off.
 Otherwise, go to step 6.
6. Perform TEST #4d: Gas Valve on page
20. If the gas valve is OK, go to step 7.
7. If the preceding steps did not correct
the problem, suspect the centrifugal switch
before replacing the ACU.
8. Reassemble all parts and panels.
9. Plug in dryer or reconnect power.
10. Perform steps under "Service Test Mode",
page 6, to verify repair.
Heat will not shut off:
ALL DRYERS:
1. Unplug dryer or disconnect power.
2. Remove console to access the machine
electronics.
PAGE 18
3. Remove connector P14 from the ACU
and measure the resistance between P14-3
and P14-6 at the connector. Refer to "Outlet
Thermistor Resistance" table on page 19 for
temperatures and their associated values.
 If the resistance corresponds to the
temperature, the outlet thermistor is good.
 If the thermistor resistance does not agree
with the table, replace the outlet thermistor.
4. Check heater coil(s) for a short to ground
(usually inside the heater box). Repair or
replace if necessary.
5. Plug in dryer or reconnect power.
6. Run an "AIR" only timed dry cycle (no
heat). Check heater relay output(s) on ACU.
Unplug dryer or disconnect power. With a
voltmeter set to AC, connect voltmeter to
terminals 1 & 2 for heater relay #1. Plug
in dryer or reconnect power. Measure the
voltage across terminals 1 & 2 for heater
relay #1. If equipped, repeat procedure
with heater relay #2.
 If voltage is present (~240VAC for electric,
~120VAC for gas), the relay is open and
working normally.
 If little or no voltage is present, the relay is
closed and heater is activated. Unplug dryer
or disconnect power and replace the ACU.
7. Unplug dryer or disconnect power.
8. Reassemble all parts and panels.
9. Plug in dryer or reconnect power.
10. Perform steps under "Service Test Mode",
page 6, to verify repair.
TEST #4a: Thermistors
NOTE: Refer to strip circuit on page 24
to diagnose outlet and inlet temperature
thermistors.
Outlet (Exhaust) Thermistor
The ACU monitors the exhaust temperature
using the outlet thermistor, and cycles the
heater relay on and off to maintain the desired
temperature. NOTE: Begin with an empty dryer
and a clean lint screen.
1. Unplug dryer or disconnect power.
2. Remove console to access the machine
electronics.
3. Remove connector P14 from the ACU
and measure the resistance between P14-3
and P14-6 at the connector. The following
table on page 19 gives temperatures and their
associated resistance values.
DO NOT REMOVE OR DESTROY