Maytag Bravos MED6300TQ Technical Education page 82

TEST #4 Heater
This test is performed when either of the fol-
lowing 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:
• Harness/connection
• Heater relay
• Thermal cut-off
• Inlet thermistor/high limit thermostat
• Heat element assembly
• Centrifugal switch
• Exhaust thermistor
• Machine control electronics
• User interface assembly
Dryer does not heat:
Locate the components using Figure 1 and
Figure 9.
1. Unplug dryer or disconnect power.
2. Remove the back panel to access the
thermal components. See Removing the
Back Panel.
Lint Duct
Drum
Light
Sensor
Harness
Wires
Connection
4 Duct
Screws
Thermistor Thermal
Figure 9. Thermal components, viewed from rear.
Thermal
Cut-Off (TCO)
Heat Inlet Thermistor/
Fuse Element High Limit
Thermostat
3. Using an ohmmeter and referring to the
appropriate wiring diagram and strip cir-
cuit (see Section 7), measure the resis-
tance across the high limit thermostat.
• If an open circuit is not detected, 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 and the high limit ther-
mostat. If connections look good, check
for continuity across each of these com-
ponents. Replace both the thermal cut-off
and the inlet thermistor/high limit thermo-
stat assembly if either the thermal cut-off
or the high limit thermostat is electrically
open.
5. Measure the resistance between the red
wires at the heater.
• If an open circuit is not detected, go to
step 7.
• If an open circuit is detected, go to
step 6.
6. Visually check the wire connections to
the heater. If the connections look good,
replace the heater.
7. Measure the resistance at the heater be-
tween the violet wire and the red wire ter-
minals.
• If an open circuit is not detected, go to
step 9.
• If an open circuit is detected, go to
step 8.
8. Visually check the wire connections to
the heater. If the connections look good,
replace the heater assembly.
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