Sub-Zero Refrigerator: Troubleshooting Grey or Dirty Ice... | appliancefaults.com

Technical Background:

The Sub-Zero refrigerator's MCU (Microcontroller Unit) controls the ice maker's operation, regulating the water inlet valve based on temperature sensor feedback. The valve opens to allow water to flow into the ice mold. Voltage paths include 120V AC to the water inlet valve solenoid.

Symptoms:

The homeowner observes that the ice cubes produced by the Sub-Zero refrigerator are grey or appear dirty, and may have an unusual taste or odor.

Possible Causes:

Water supply contamination
Stale water in the ice maker
Dirty water filter
Mineral buildup in the ice maker
Issues with the water inlet valve
Contaminated ice maker components

Solution:

1

Turn off the ice maker by raising the wire bail arm or selecting 'OFF' on the control panel.
2

Turn off the water supply to the refrigerator using the shut-off valve, typically located under the sink or behind the fridge.
3

Replace the water filter with a new Sub-Zero approved filter. Refer to your owner's manual for the correct filter model.
4

Flush the water lines by dispensing water through the dispenser for 5 minutes.
5

Clean the ice maker components. Remove any ice buildup and wipe down the interior with a solution of mild soap and water. Rinse thoroughly.
6

Inspect the water inlet valve. Ensure it is functioning properly and not leaking. If the valve appears cracked or visibly corroded, or if you are not getting 120V AC to the valve when the ice maker cycles to fill with water, replace it.
7

Restart the ice maker and monitor ice production. Discard the first few batches of ice.

Safety Warning:

Always disconnect power to the refrigerator at the breaker panel before performing any repairs. Use Lock-Out/Tag-Out (LOTO) procedures to ensure the breaker remains off. High voltage is present in the control panel and water inlet valve wiring.

Prevention:

Replace the water filter every 6 months or as recommended by Sub-Zero. Periodically clean the ice maker compartment with a mild soap and water solution. Consider installing a whole-house water filtration system.

Expert Tip:

To manually initiate an ice harvest cycle on some Sub-Zero models, simultaneously press and hold the 'Freezer Up' and 'Freezer Down' buttons for 5 seconds. This forces the ice maker to eject the ice, which is useful for diagnosing ice maker problems and clearing jams.

Frequently Asked Questions

•How often should I replace the water filter in my Sub-Zero refrigerator?

Sub-Zero recommends replacing the water filter every 6 months, but this can vary depending on the water quality in your area. If you notice a decrease in water flow or ice quality, replace it sooner.

•What is the best way to clean the ice maker compartment?

Turn off the ice maker and water supply. Remove any ice. Use a mild solution of soap and water to wipe down all surfaces. Rinse thoroughly with clean water and dry before restarting the ice maker.

•How do I test the water inlet valve?

First, ensure the ice maker is calling for water (you should hear a hum). Use a multimeter to check for 120V AC at the valve terminals when the ice maker is supposed to be filling. If voltage is present and the valve doesn't open, the valve is likely faulty and needs replacement. If no voltage is present, the problem is likely further upstream, such as the ice maker control module.

Sub-Zero Refrigerator: Troubleshooting Grey or Dirty Ice Cubes

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How often should I replace the water filter in my Sub-Zero refrigerator?

•What is the best way to clean the ice maker compartment?

•How do I test the water inlet valve?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: