Sub-Zero BI/Designer Code 30-8-05: Ice maker fill signal missing

What 30-8-05 means

Sub-Zero Classic BI models such as the BI-36UFD/S and Designer columns like the DET3050CI both list 30-8-05 as an ice maker miswire with normal temperatures. On the BI the control received no signal from the ice maker asking for a fill; on Designer models it is described as no water valve signal coming in from the ice maker. Cooling stays normal, but the tray never gets water, so ice output drops off and the bin slowly empties.

Common causes of 30-8-05

Ice maker not sending its fill request
Signal wire between ice maker and control loose or misrouted
Recent ice maker replacement wired incorrectly

✓ One safe check you can try

1. Confirm the ice maker is switched on and the bin is in place. 2. Check the household shutoff valve and look under the unit for kinked supply tubing. 3. Replace the water filter if it is past its change date. 4. Keep using the unit; food storage is not affected.

! Why to stop there

The signal path must be checked at the ice maker and at the board.
Wiring corrections need the model's diagram.
Swapping the ice maker without testing may not cure a wiring issue.

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.

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30-8-0530-8-05 questions

Why does the code mention normal temps?

It tells the technician the freezer is holding temperature, so the problem is a wiring or signal issue at the ice maker rather than a cooling problem. Your food is safe while you wait.

Will a new water filter clear 30-8-05?

A clogged filter can slow ice output, but this code means the fill request signal never arrived. Changing an overdue filter is still sensible, yet the wiring check is what solves the code.

How do you find the missing signal?

We watch the ice maker call for water and test the line at both ends. After that, you get a written price, and the repair is covered by our 30-day workmanship warranty.