Maytag MFR Series Service Manual page 160

MOTOR pHaSe TeST
1. Unplug washer or disconnect power.
2. Remove the two screws that secure the
inverter to the base of the washer.
3. Remove the wire ties restricting the wire
harness between the motor and inverter.
4. Remove the green ground wire, L1 and
Neutral wires and the JP- 4 connector from
the inverter.
5. Lift the front end of the inverter to disengage
the rear locking tabs from the slots in the
base of the washer.
6. Slowly move the inverter, with the motor
harness attached, toward the rear of the
washer until access to remaining wires is
gained.
7. Remove the screw securing the splash
shield covering from the inverter.
8. Pivot the splash shield with the top screw
still in the inverter control board metal
frame, allowing the plastic shield to become
an electrical shield between the inverter and
the base.
9. Connect the power test cord to the L1,
N and Ground wire. (Leave the JP- 4
connector disconnected.
Phase Wire Colors
C Yellow or Orange Runs
B White or Red
A Black or Blue
Motor Condition
- Phases A & B are operating correctly
Does Not Run - Phase A or B is non-functional
Runs - Phases A & C are operating correctly
Does Not Run - Phase A or C is non-functional
Runs - Phases B & C are operating correctly
Does Not Run - Phase B or C is non-functional
7-10
10. Check phase C by disconnecting the
Yellow or Orange wire at the inverter. Plug
in motor test cord into a wall outlet. If
the motor operates with a slight growling
sound phases A & B are operating correctly.
Unplug motor test cord from wall outlet.
Reconnect the Yellow or Orange wire and
test with phase B disconnected (see next
step). If the motor does not run properly,
phase A or B is not functioning. Perform
Motor Windings Check (See page 7-11).
11. Check phase B by disconnecting the White
or Red wire on the inverter. Plug motor test
cord into wall outlet. If the motor operates
with slight growling sound, phases A & C
are operating properly. Disconnect motor
test cord form wall outlet. Reconnect phase
B and test with phase A disconnected
(see next step). If the motor does not run
properly, phase A or C is not functioning.
Perform the Motor Windings Check
(See page 7-11).
12. Check phase A by disconnecting the Black
or Blue wire on the inverter. Plug motor test
cord into wall outlet. If the motor operates
with slight growling sound, phases B & C
are operating properly. Disconnect motor
test cord from wall outlet. Reconnect phase
A and test with phase B disconnected (see
previous step). If the motor does not run
properly, phase A or B is not functioning.
Perform Motor Windings Check
(See page 7-11).
Result / Solution
(Check Phase A & B)
Replace the motor
(Check Phase A & C)
Replace the motor
(Check Phase B & C)
Replace the motor