Maytag MTB1504ARW Operations Instructions download pdf (Page 7)

Component Testing

WARNING

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 Test Procedures

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 raise

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.

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

Temperature control is a capillary tube

operating a single pole, single throw

switch.

Temperature control controls run cycle

through defrost timer.

Check for proper calibration with thermocouple capillary in air supply well by

recording cut-in and cut-out temperatures at middle setting. Refer to tech sheet

for model being serviced for expected temperatures.

Check control contacts are opening by disconnecting electrical leads to control

and turning control knob to coldest setting. Check for continuity across

terminals.

Altitude Counter in Feet

Feet Above

Sea Level

Turn Screw

Clockwise (Angular

Degrees)

Temperature

control

Altitude Adjustment

When altitude adjustment is required on a

G.E. control, turn altitude adjustment

screw 1/7 turn counter clockwise for each

1,000 feet increase in altitude up to 10,000

feet. One full turn equals 10,000 feet

maximum.

In most cases the need for altitude

adjustments can be avoided by simply

turning temperature control knob to colder

setting.

2,000

4,000

6,000

8,000

10,000

129

174

216

Ice maker Optional on some models.

See “Ice Maker” section for service

information.

Condenser motor

Condenser fan moves cooling air across

condenser coil and compressor body.

Condenser fan motor is in parallel circuit

with compressor.

Check resistance across coil.

Evaporator fan

motor

Evaporator fan moves air across

evaporator coil and through the refrigerator

and freezer compartment.

1. Disconnect power to unit.

2. Disconnect fan motor leads.

3. Check resistance from ground connection solder. Trace to motor frame must

not exceed .05 ohms.

4. Check for the proper operating voltage at the connector to motor with unit in

refrigeration mode and compressor operating.

300

270

240

210

180

150

120

330

16022675

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Maytag MTB1504ARW Operations Instructions Page 7

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