Maytag Washer: Testing the Motor Capacitor with a... | appliancefaults.com

Technical Background:

MCU Logic and Voltage Paths:
The Maytag washer's motor relies on the capacitor to provide a boost of energy for starting and running. The MCU sends a signal to the motor relay to energize the motor windings. The capacitor provides the necessary phase shift for the motor to start rotating. The capacitor stores electrical energy, smoothing out the power delivery to the motor. A failing capacitor cannot store enough energy, leading to starting problems or motor failure.

Symptoms:

US Homeowner Observations:
• Washer motor hums but doesn't start.
• Washer starts slowly or erratically.
• Washer stops mid-cycle.
• Burning smell coming from the washer.
• Weak or no spin cycle.

Possible Causes:

Failed motor capacitor
Loose wiring connections
Corroded terminals
Faulty motor control unit (MCU)
Overloaded washing machine
Power surge damage

Solution:

1

Disconnect the washer from the power outlet and turn off the breaker.
2

Locate the motor capacitor, typically near the motor or inside the control panel. It's usually a cylindrical component.
3

Discharge the capacitor using a 20,000-ohm resistor rated for at least 5 watts. Connect the resistor leads to the capacitor terminals for 5-10 seconds.
4

Set your digital multimeter to measure capacitance (farads).
5

Disconnect the wires from the capacitor terminals.
6

Connect the multimeter probes to the capacitor terminals.
7

Compare the measured capacitance value to the value printed on the capacitor label. A reading significantly lower (e.g., more than 20% lower) indicates a failing capacitor.

Safety Warning:

LOTO and High Voltage Warning:
Always disconnect power to the washer at the breaker panel before performing any repairs. Capacitors store high-voltage electricity even after the washer is unplugged. Discharge the capacitor before handling it. Use proper Lock Out Tag Out (LOTO) procedures to prevent accidental energization of the circuit.

Prevention:

• Avoid overloading the washing machine.
• Use a surge protector to protect against power surges.
• Inspect wiring connections regularly for looseness or corrosion.
• Replace the capacitor every 5-7 years as preventative maintenance.

Expert Tip:

Some Maytag washers have a service mode. You can access it by pressing a specific button sequence (consult the service manual for your model). This mode can provide diagnostic codes related to motor and capacitor performance. Another useful trick is to test the ESR (Equivalent Series Resistance) of the capacitor with a meter that has this function. A high ESR is a very good indicator of capacitor failure, even if the capacitance value appears to be within range.

Frequently Asked Questions

•What is the correct capacitance value for my Maytag washer motor capacitor?

The capacitance value is printed on the capacitor's label. Consult your washer's service manual for the exact specifications.

•How do I discharge a capacitor safely without a resistor?

While a resistor is the safest method, you can carefully use an insulated screwdriver with a well-insulated handle to short the capacitor terminals. Exercise extreme caution and avoid touching any metal parts of the screwdriver.

•If the capacitor tests good, what else could be causing the motor to hum but not start?

If the capacitor tests good, the problem could be a seized motor bearing, a faulty motor winding, a defective motor relay on the control board, or an obstruction in the washer's tub or pump.

Maytag Washer: Testing the Motor Capacitor with a Multimeter

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct capacitance value for my Maytag washer motor capacitor?

•How do I discharge a capacitor safely without a resistor?

•If the capacitor tests good, what else could be causing the motor to hum but not start?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: