Maytag MFI2266AES Service Manual page 7

Component Testing
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
Component Description
Overload / Relay When voltage is connected and relay is
cool, current passes through relay to start
winding.
After a short time, current heats the
resistor in relay and resistance will rise
blocking current flow through relay.
Start winding remains in the circuit through
run capacitor.
Solid state relay plugs directly on
compressor start and run terminals. Relay
terminals 2 and 3 are connected within
relay. Run capacitor is connected to relay
terminal 3. L2 side of 120 VAC power is
connected to relay terminal 2.
Control board See "Control Board" section for
troubleshooting information.
Evaporator fan Evaporator fan moves air across
motor evaporator coil and throughout refrigerator
cabinet.
Ice Box fan motor Ice Box fan moves air across Ice Maker
and throughout refrigerator cabinet.
Right Refrigerator Single pole, single throw switch completes
& Freezer light circuit for light when door is open.
switch
Ice maker water Controls water flow to the ice maker.
valve
Controlled by ice maker.
See "Control Board" section for further
testing information.
Evaporator heater Activated when defrost thermostat control
(defrost) board completes circuit through heater.
Left Refrigerator Single pole, double throw switch
Light Switch completes circuit for light when door is
open.
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!
WARNING
Test Procedures
1. Disconnect power to the refrigerator.
2. Remove relay cover and disconnect leads.
3. Check resistance across terminals 2 and 3 with an ohmmeter:
Normal = 3 to 12 ohms
Shorted = 0 ohms
Open = infinite ohms
1. Use Control board testing to check operation of motor.
2. If fan motor does not operate, check for voltage at motor leads.
3. Replace motor if power is present.
4. Replace Control board if no power.
1. Use Control board testing to check operation of motor.
2. If fan motor does not operate check for voltage at motor leads.
3. Replace motor if power is present.
4. Replace Control board if no power.
Check resistant across terminals.
Switch arm depressed
"C" and "NC" terminals
Switch arm up
"C" and "NC" terminals
Check resistance across coil windings.
Check resistance across heater.
To check defrost system :
1. Use Control Board testing to check operation of defrost heater.
2. If heater does not operate, check defrost thermostat to see if closed.
3. If no power to heater, replace control board.
Check resistant across terminals.
Switch arm depressed
"C" and "NC" terminals
"C" and "NO" terminals
Switch arm up
"C" and "NC" terminals
"C" and "NO" terminals
16026312
Open
Closed
Open
Closed
Closed
Open
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