Sub-Zero ice maker repair on Oahu
On Designer models, a Sub-Zero ice maker turns itself off after 20 cycles in which no door or drawer was opened. That looks like a failure and is not one. We sort the real faults from the built-in ones in Oahu homes.
Why has my Sub-Zero stopped making ice?
A Sub-Zero that has stopped making ice usually has a freezer that is not cold enough, a raised shut-off arm, or a crooked bin. The freezer should read 5°F or colder, and the maker recommends 0°F. The arm moves only about an inch, must be down, and needs its white plastic rudder attached. On some models the bin presses a switch, so a bin pushed in at an angle halts production. If all three look right, the general causes on our no-ice page come next.
The flashing cube, step by step
Hold ALARM
On a Classic unit, press and hold ALARM for 15 seconds. The display reads CFC when the reset has taken.
Two keys
Cube still flashing? Hold Max Ice and Ice Maker together for 5 seconds. That is the second documented reset.
Watch it
Give the freezer time. Ice only forms and drops once the compartment is back at temperature, which on a cold start takes up to a day.
Book it
If the cube icon keeps coming back after both resets, Sub-Zero treats it as a repair visit, and so do we.
Sub-Zero ice numbers
Sources: Sub-Zero no-ice troubleshooting answer; Sub-Zero Classic use and care guide
Three Sub-Zero ice makers, three sets of quirks
The same no-ice complaint means different things on a Classic, a Designer and an undercounter unit. Match your model prefix first.
| Line | Model prefixes | What is different | What you can check | When to book |
|---|---|---|---|---|
| Classic | BI, CL | Error 50 U 87 on BI units flags a flow meter that sees no water | Confirm water pressure, then breaker off for 30 seconds | The code returns after both steps |
| Designer | IT, IC, ID, DET, DEC | Shuts the ice maker off after 20 idle cycles | Open a door or drawer and switch the ice maker back on | It stays off with normal daily use |
| Undercounter | 315I | The bin is not refrigerated, so stored ice melts in heat or sun | Pour a cup of water behind the curtain and watch the spray change | Weak spray, or no ice with good pressure |