Maytag Bravos MED6300TQ Technical Education page 85

TEST #4c Thermal Cut-Off
If the dryer does not produce heat, check the
status of the thermal cut-off.
1. Unplug dryer or disconnect power.
2. Access the thermal cut-off by first remov-
ing the back panel. See Removing the
Back Panel.
3. Using an ohmmeter, check the continuity
across the thermal cut-off. See Figure 9
for location.
• If the ohmmeter indicates an open cir-
cuit, replace the failed thermal cut-off
and inlet thermistor/high limit thermo-
stat. In addition, check for blocked or
improper exhaust system, or failed
heat element.
TEST #5 Moisture Sensor
NOTE: This test is started with the machine
completely assembled.
This test is performed when an automatic cy-
cle stops too soon, or runs much longer than
expected.
NOTE: Dryer will shut down automatically af-
ter 2-1/2 hours.
The following items are part of this system:
• Harness/connection
• Metal sensor strips
• Machine control electronics
1. Activate the diagnostic test mode and
advance past saved fault codes.
2. Open the dryer door. If a continuous beep
tone is heard and an alphanumeric num-
ber is displayed on the console as soon
as the door is opened, a short circuit ex-
ists in the moisture sensor system.
• If this doesn't happen, go to step 3.
• Otherwise, go to step 4.
NOTE: Over drying may be caused by a
short circuit in the sensor system.
3. Locate the two metal sensor strips on the
inside of the dryer. Bridge these strips
with a wet cloth or finger.
• If a continuous beep tone is heard and
a software revision number is displayed
on the console, the sensor passes the
test. Go to step 8.
• If a beep tone is not heard, or a contin-
uous beep tone is heard before bridg-
ing the moisture strips, continue with
step 4.
4. Accesss the moisture sensor wires.
• Remove the back panel. See Remov-
ing the Back Panel.
• Remove the lint screen.
• Remove the two screws holding the
lint screen duct to the top.
• Remove four screws from bottom of
the duct in rear. See Figure 9.
• Remove the duct from the dryer to ac-
cess the moisture sensor.
• Disconnect the sensor connector. See
Figure 10.
Sensor
Figure 10. Disconnect sensor connector.
5. Access the machine control electronics.
See Accessing & Removing the Electronic
Assemblies. Remove the connector P13
from the circuit board. Check the main har-
ness connections between the sensor con-
nector and machine control for a short or
open circuit.
• Replace the main harness if necessary.
• If harness is OK, continue with step 6.
6-11
Sensor Harness
with MOVs
Sensor
(Metal Oxide
Connector
Varistors)
Blower
Housing