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TECH SHEET - DO NOT DISCARD
PAGE 6
If the resistance reading goes from infinity
to a few ohms as pulley arm closes the
switch, belt switch is OK. If not, replace the
belt switch.
If belt switch is OK and there is still an open
circuit, check and repair the wiring harness.
9.
Door Switch problems can be uncovered by
following procedure under DIAGNOSTIC: Door
Switch, page 1; however, if this was not done,
the following can be done without applying
power to the dryer. Connect an ohmmeter
across P8-3 (neutral, white wire) and P8-4
(door, tan wire).
With the door properly closed, the ohmmeter
should indicate a closed circuit (0–2
Ω
).
If not, replace the door switch assembly.
TEST #4
Heater
This test is performed when either of the following
situations occur:
Dryer does not heat
Heat will not shut off
This test checks the components making up the
heating circuit. The following items are part of this
system:
Part of Heating System
Electric
Dryer
Gas
Dryer
Harness/connection
Heater relay
Thermal cut-off
Thermal fuse
no
Inlet thermistor/high limit thermostat
assembly
no
High limit thermostat
no
Heat element assembly
no
Gas burner assembly
no
Centrifugal switch
Outlet thermistor
Machine control electronics.
See ESD information, page 1.
Console electronics and housing
assembly
Gas supply
no
Dryer does not heat:
Locate the components using figure 11.
ELECTRIC DRYER:
1.
Unplug dryer or disconnect power.
2.
Remove the toe panel to access the thermal
components. See Removing the Toe Panel,
page 9.
3.
Using an ohmmeter and referring to the wiring
diagram, measure the resistance from the red
wire terminal at the thermal cut-off to the red
wire terminal at the heater.
If the resistance is about 10
Ω
, go to step 5.
If an open circuit is detected, go to step 4.
4.
Visually check the wire connections to the
thermal cut-off, high limit thermostat, and
heater. If connections look good, check for
continuity across each of these components.
Replace the heater if it is electrically open.
Replace both the thermal cut-off and inlet
thermistor/high limit thermostat assembly
if either the thermal cut-off or the high limit
thermostat is electrically open.
5.
If no open circuit is detected, remove the
P4 connector, then measure the resistance
between P4-3 (red wire) and P4-6 (red wire)
at the connector. See figure 17, page 10, for
connector location; and Accessing & Removing
the Electronic Assemblies, page 9.
If 5–15 k
Ω
are measured, replace the
machine control electronics.
If the resistance is less than 1 k
Ω
, replace
the outlet thermistor.
GAS DRYER:
1.
Unplug dryer or disconnect power.
2.
Remove the toe panel to access the thermal
components. See Removing the Toe Panel,
page 9.
3.
Perform TEST #4b, page 7. If the thermal fuse
is OK, go to step 4.
4.
Perform TEST #4c, page 7. If the thermal
cut-off is OK, go to step 5.
5.
Locate the high limit thermostat. See figure 11.
Measure the continuity through it by
connecting the meter probes on the red wire
and black wire terminals.
If there is an open circuit, replace the high
limit thermostat and the thermal cut-off.
Otherwise, go to step 6.
6.
Perform TEST #4d, page 8. If this is OK,
replace the machine control electronics.
Heat will not shut off:
1.
Unplug dryer or disconnect power.
2.
Access the machine control electronics.
See figure 17, page 10, for connector location;
and Accessing & Removing the Electronic
Assemblies, page 9.
ELECTRIC DRYER:
Remove the P4 connector,
then measure the resistance between P4-3
(red wire) and P4-6 (red wire) at the connector.
GAS DRYER:
Remove the P14 connector,
then measure the resistance between P14-3
(red-white wire) and P14-6 (red-white wire)
at the connector.
ALL DRYERS:
If 5–15 k
Ω
are measured, replace the
machine control electronics.
If the resistance is greater than 20 k
Ω
,
replace the outlet thermistor.
Figure 11.
Thermal Components, viewed
from front.
Lt. Blue
Wires
Belt Switch
Belt Switch
Pulley
1
5
3
4
6
2
Figure 10.
Checking the belt switch.