Whirlpool WRS588FIHZ Refrigerator: Freezer Floor Ice... | appliancefaults.com

Technical Background:

The Whirlpool WRS588FIHZ utilizes an adaptive defrost system controlled by the main control unit (MCU). The MCU monitors evaporator temperature and cycles the defrost heater to melt frost buildup. The defrost thermostat acts as a safety device, preventing the heater from overheating. A blocked defrost drain prevents melted water from escaping, leading to ice accumulation on the freezer floor. Voltage paths include 120V AC to the heater during the defrost cycle, regulated by the MCU and monitored by the defrost thermostat.

Symptoms:

The homeowner reports excessive ice buildup on the floor of the freezer compartment in their Whirlpool WRS588FIHZ side-by-side refrigerator. This ice buildup can reduce freezer space and impact cooling performance.

Possible Causes:

Defective defrost heater
Faulty defrost thermostat
Failed defrost timer (integrated into the main control board on this model)
Blocked defrost drain
Air leak into the freezer compartment
Defective door seal

Solution:

1

Unplug the refrigerator or turn off the breaker to the unit.
2

Remove the freezer back panel to access the evaporator coil. A 1/4-inch nut driver will be required.
3

Inspect the defrost heater for continuity using a multimeter. A reading of OL (open loop) indicates a failed heater. Replace if needed.
4

Test the defrost thermostat for continuity when cold (below 40°F). It should be closed. If open, replace the thermostat.
5

Check the defrost drain for ice blockage. Use a steamer or hot water to clear the drain. Verify the drain is flowing into the drain pan below the refrigerator.
6

Inspect the door seal for damage or gaps. Replace the seal if necessary.
7

After completing repairs, plug the refrigerator back in or turn the breaker back on and monitor for proper defrost cycles.

Safety Warning:

Always disconnect power to the appliance before performing any repairs. This refrigerator operates on 120V AC. Lock-Out/Tag-Out (LOTO) procedures should be followed to prevent accidental energization during service.

Prevention:

Regularly clean the condenser coils (located at the back or bottom of the refrigerator) every 6 months. Check the door seal periodically for damage and replace as needed. Avoid overpacking the freezer, which can obstruct airflow and contribute to ice buildup.

Expert Tip:

You can force a defrost cycle by pressing and holding the Freezer Temperature DOWN and Refrigerator Temperature UP buttons simultaneously for 5 seconds. The refrigerator will enter a test mode and begin a defrost cycle. Observe the heater to verify it's working.

Frequently Asked Questions

•How do I access the defrost heater on this model?

Remove the freezer back panel. The defrost heater is typically located at the bottom of the evaporator coil assembly.

•What voltage should I expect to see at the defrost heater during a defrost cycle?

You should measure approximately 120V AC at the defrost heater during the defrost cycle if the control board is sending power.

•If the defrost heater and thermostat test good, what else could be causing the ice buildup?

The main control board may be faulty, failing to initiate defrost cycles. Also, ensure the freezer door is closing and sealing properly to prevent moist air from entering.

Whirlpool WRS588FIHZ Refrigerator: Freezer Floor Ice Buildup - Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the defrost heater on this model?

•What voltage should I expect to see at the defrost heater during a defrost cycle?

•If the defrost heater and thermostat test good, what else could be causing the ice buildup?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: