Testing Contactor - Maytag MFR Series Service Manual

DANGER
Electrical Shock Hazard
Only authorized technicians should
perform diagnostic voltage
measurements.
After performing voltage
measurements, disconnect power
before servicing.
Failure to follow these instructions
can result in death or electrical
shock.
When performing live voltage measurements, you must do the following:
Verify the controls are in the off position so that the appliance does not start when energized.
<
Allow enough space to perform the voltage measurements without obstructions.
<
Keep other people a safe distance away from the appliance to prevent potential injury.
<
Always use the proper testing equipment.
<
After voltage measurements, always disconnect power before servicing.
<
The contactor is a multi-pole switch activated
by an electromagnet to close the contacts.
The magnet is activated by voltage supplied
to a coil of wire wrapped around a ferrous
metal bar (usually made of iron). The voltage
is supplied to the coil from the control board,
whenever a cycle is started.
If the contactor contacts fail to close, the
inverter will not receive input power to convert
to 3 phase, which runs the motor. The first
cause of contacts failing to close is no voltage
supplied to the contactor coil.
1. Check for proper line voltage (208-240V) at
the coil.

TeSTinG COnTaCTOR

Voltage Measurement Safety Information
7-5
WARNING
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
2. Unplug washer or disconnect power.
3. Connect voltage measurement equipment.
4. Plug in washer or reconnect power and
confirm voltage reading is 208-240V.
5. If correct voltage is found and the contactor
is not pulling in, then the contacts can be
tested by manually pushing in contactor.
6. If this allows the motor to run then the
contactor coil needs to be replaced. In most
instances the entire contactor is replaced,
yet in some cases the coils are replaceable
separately.
7. Unplug washer or disconnect power.