Sub-Zero CL Code 40-8-01: Ice maker overfilling

What 40-8-01 means

Current Classic CL models like the CL3650U and CL4850SD use 40-8-01 for excessive ice maker fill. The control detected more water going to the ice maker than it should have. Overfilling can leave cubes fused together, ice spilling over the mold, a solid block in the bin, or water freezing where it should not. The rest of the refrigerator keeps cooling normally.

Common causes of 40-8-01

Water valve passing extra water or not closing on time
Very high household water pressure
Ice maker not ending its fill correctly

✓ One safe check you can try

1. Turn off the ice maker switch to stop more water from entering. 2. Empty fused ice from the bin and let the area dry. 3. Check the floor and the area under the ice maker for leaks. 4. If water keeps flowing with the ice maker off, close the shutoff valve.

! Why to stop there

The water valve is behind the lower grille near electrical connections.
Measuring fill volume requires a timed test.
Leaks inside cabinetry can cause hidden damage.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Refrigerator codes

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40-8-0140-8-01 questions

Why is my ice fused into a block?

With 40-8-01, too much water reached the ice maker. Extra water overflows the mold and freezes together in the bin. Turning the ice maker off stops more water until we test the valve.

Could high water pressure cause this?

Yes. Unusually high pressure can push more water than expected during each fill. We measure pressure as part of the visit and check the valve at the same time.

How is the repair done?

We test the valve and the ice maker fill cycle, then replace what is needed. You approve a written price first, and our 30-day workmanship warranty covers the job.