Maytag MDG25PN Service Manual page 103

• Connect an ohmmeter to neutral, and the
white connector on terminal P4 of the CCU.
• With the door properly closed, the
ohmmeter should Indicate continuity
(0–2Ω).
• If not, isolate the two door switches, test
individually as explained in step 3.
5. Replace the failed door switch(es).
TEST #3: Heater Test
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
Harness / connection
Heater relay
High temp cutout
Thermal fuse
High temp thermostat
Heat element assembly
Gas burner assembly
Centrifugal switch
Exhaust thermistor
Machine control electronics.
See ESD information.
Console electronics and
housing assembly
Gas supply
Electric Gas
Dryer Dryer
yes yes
yes yes
yes yes
yes yes
yes yes
yes no
no yes
yes yes
yes yes
yes yes
yes yes
no yes
6-7
Dryer does not heat:
ELEcTric DrYEr:
1. Unplug dryer or disconnect power.
2. Remove the service panel to access the
thermal components.
3. Using an ohmmeter and referring to the
wiring diagram, measure the resistance
between the red wire and red & white wires
on the heater coil.
• If the resistance when cold is between
11 and 16Ω, go to step 5.
• If an open circuit (infinite Ω) is detected,
replace heater coil.
4. Test thermostat circuit, if closed circuit
(0Ω) is found, go to step 5, if open circuit
(infinite Ω) is detected, visually check the
wire connections to the high temp cutout,
high temp thermostat, thermal fuse, and
heater coil. If connections look good, check
for continuity (0 Ω) across each of these
components. Replace both the high temp
cutout and high temp thermostat, if either
one is electrically open.
• To check the thermostat circuit, check for
closed circuit (0Ω) between the heat relay
red wire and red white stripe wire on the
heater coil.
5. 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.