Motorized Air Door; Defrost Heater & Bimetal - KitchenAid 2003 M Technical Education

Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

MOTORIZED AIR DOOR

Refer to page 4-18 for the procedure for servic-
ing the motorized air door.
1. Run the diagnostics tests (see page 6-1)
and check for the proper operation of the
air door in step 06.
NOTE: A 12 volts DC square wave is supplied
to the air door in a series of short pulses. It is not
possible to obtain a reliable voltage reading
with a VOM. The remaining steps will allow you
to check the resistance of the air door motor.
2. Unplug refrigerator or disconnect power.
3. Disconnect the motorized air door wire
connector from the main harness.
4. Set the ohmmeter to the R x 10 scale.
5. Touch one of the ohmmeter test leads to
the motorized air door connector with the
yellow wire and the other test lead to the
red wire. The meter should indicate ap-
proximately 375 to 425 Ω.
6. Touch one of the ohmmeter test leads to
the motorized air door connector with the
white wire and the other test lead to the
blue wire. The meter should indicate ap-
proximately 375 to 425 Ω.
Electrical Shock Hazard
DEFROST HEATER & BIMETAL
Refer to page 4-14 for the procedures for
servicing the defrost heater and bimetal.
1. Run the diagnostics tests (see page 6-1)
and check for the proper operation of the
defrost heater and bimetal in step 07.
NOTE: If the bimetal is closed, the voltage at
the defrost heater terminals will be 120 volts
AC. The remaining steps will allow you to
check the resistance of the defrost heater and
bimetal.
2. Unplug refrigerator or disconnect power.
3. Disconnect one of the wires going to the
defrost heater.
4. Set the ohmmeter to the R x 1 scale.
5. Touch the ohmmeter test leads to the
defrost heater terminals. The meter should
indicate approximately 19 to 27 Ω.
6. Touch the ohmmeter test leads to the
defrost bimetal wire connectors. The meter
should indicate as follows:
• With the bimetal below 20° F, the meter
should indicate continuity (0 Ω).
• With the bimetal above 50° F, the meter
should indicate an open circuit (infinite).
5-4