Roper Refrigerator: Start Relay Clicking, Compressor... | appliancefaults.com

Technical Background:

The MCU (Microcontroller Unit) sends a signal to activate the start relay. The start relay, in conjunction with the overload protector and potentially a run capacitor, provides the necessary voltage boost to start the compressor. The compressor's motor windings require a high initial current to overcome inertia. If the relay fails to energize or de-energize correctly, or if the compressor is faulty, the startup process is interrupted.

Symptoms:

The homeowner observes that the Roper refrigerator's start relay is clicking repeatedly, but the compressor is not turning on. The refrigerator is not cooling. A buzzing or humming sound may also be heard.

Possible Causes:

Faulty start relay
Defective compressor
Overload protector tripped
Wiring issue
Low voltage supply
Failing run capacitor (if equipped)

Solution:

1

Unplug the refrigerator from the outlet.
2

Locate the start relay, overload protector, and run capacitor (if equipped) near the compressor.
3

Disconnect the wires from the start relay and overload protector.
4

Test the start relay for continuity using a multimeter. A failed start relay will show an open circuit or high resistance across its terminals.
5

Check the compressor windings for continuity using a multimeter. Open windings indicate a failed compressor. Also, check for shorts to ground from the compressor terminals to the compressor body. The expected resistance value varies by model.
6

Inspect the overload protector for continuity. If open, it may have tripped due to excessive heat. A properly functioning overload protector should show continuity.
7

Verify 120V AC power is reaching the refrigerator outlet using a multimeter. Check the breaker in the breaker panel. Ensure the outlet receptacle is properly wired.

Safety Warning:

Disconnect power (LOTO - Lock Out Tag Out) to the refrigerator before performing any repairs. High voltage is present in the control circuits. Capacitors can store a charge even after the unit is unplugged, so discharge them safely before handling.

Prevention:

Clean the condenser coils regularly (every 6 months) with a vacuum cleaner to ensure proper heat dissipation. Avoid overloading the refrigerator. Ensure proper ventilation around the refrigerator. Periodically check the voltage at the outlet.

Expert Tip:

A quick test for a failing compressor (with extreme caution and proper safety gear) is to use a hard start kit. If the compressor starts with a hard start kit, it is likely failing and drawing excessive current, and should be replaced. This is a temporary diagnostic measure only.

Frequently Asked Questions

•What are the typical resistance readings I should expect on a Roper refrigerator compressor?

Compressor winding resistance varies by model, but a typical range is 2-15 ohms between the common, start, and run terminals. A short to ground will show very low resistance between any terminal and the compressor body.

•How do I properly discharge a capacitor in a refrigerator?

Use a 20,000-ohm, 2-watt resistor with insulated leads to safely discharge the capacitor. Connect the resistor leads to the capacitor terminals for several seconds. Verify discharge with a multimeter.

•Where can I find the wiring diagram for my specific Roper refrigerator model?

The wiring diagram is usually located on the back of the refrigerator, often taped to the cabinet or inside the control panel. You can also find it online at appliancepartspros.com or searspartsdirect.com using your model number.

Roper Refrigerator: Start Relay Clicking, Compressor Won't Start Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What are the typical resistance readings I should expect on a Roper refrigerator compressor?

•How do I properly discharge a capacitor in a refrigerator?

•Where can I find the wiring diagram for my specific Roper refrigerator model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: