Maytag MDG25PN Service Manual page 104

GaS DrYEr:
1. Unplug dryer or disconnect power.
2. Locate the red wire at the gas valve and the
red wire on the thermal fuse that is coming
from the control, remove this red wire from
the thermal fuse and check resistance
from the bare terminal on the thermal fuse
to the red wire at the gas valve. it there is
continuity (0 Ω) then skip to step 8.
3. Remove the service panel to access the
thermal components.
4. Perform TEST #3a. If the thermal fuse is
OK, go to step 5.
5. Check thermistor by removing one of the
wires and checking resistance across both
terminals.
• If an open circuit (infinite Ω) is detected,
replace thermistor. Check readings on chart
(See page 5-9).
6. Perform TEST #3b. If the high temp cutout
is OK, go to step 7.
7. Locate the high temp thermostat. Remove
the wires from it. Measure the continuity
through it by touching the meter probes on
the bared terminals.
• If there is an open circuit (infinite Ω),
replace the high temp thermostat and high
temp cutout as a set.
• Otherwise, go to step 8.
8. Perform TEST #3c (Gas Valve Test). If this
is OK, go to step 9.
9. If heater coil and thermostat circuit check
OK, check centrifugal switch 1M to 2M.
• Manually close motor switch while
Checking for closed circuit (0Ω) between
1M and 2M.
• If no closed circuit (0Ω) is detected,
replace the motor.
• If closed circuit (0Ω) is detected, replace
CCU.
Dryer will not shut off:
1. Unplug dryer or disconnect power.
2. Check for shorted electric heat coil to the
coil heater casing.
• If closed circuit (0Ω) between coil and
heater casing is detected, replace heater
coil.
3. Look for shorted terminals on the thermistor.
Sometimes small metal objects will fall
across the two terminals of the thermistor
and short them together.
4. Check thermistor resistance and compare to
chart, (See page 5-9).
5. Remove the red and black wires from the
heat relay on the CCU. Check for infinite
resistance between the two terminals of the
heat relay.
• If closed circuit (0Ω) is detected with no
power to dryer, replace CCU.
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