Sub-Zero Classic BI Code 90-5-99: Keypad not responding

What 90-5-99 means

Classic Built-In units with electronic control, the BI-36UFD/S among them, display 90-5-99 for a control-system error the board files under other. In practice it means the keypad is not responsive or not functional. You touch the keys and nothing happens, or only some keys work, while the unit keeps running on the settings it already had and cooling goes on as before.

Common causes of 90-5-99

Keypad that has stopped working
Loose cable between the keypad and the board
Control panel electronics damaged by moisture or a power event

✓ One safe check you can try

1. Note 90-5-99. 2. Check whether the keypad lock is on and unlock it if your model has that option. 3. Give the control a fresh start by keeping the breaker off for two minutes. 4. Try the keys again with a dry finger. 5. Call us if nothing responds.

! Why to stop there

The keypad cable connection sits behind the control panel.
We must test whether the keypad or the board is responsible.
Forcing the panel open can break trim clips.

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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Other Refrigerator codes

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90-5-9990-5-99 questions

Could the keypad just be locked?

Check that first, since a locked keypad also ignores touches. If the lock is off and the keys still do nothing with 90-5-99 showing, the keypad or its connection needs service.

Can I keep using the refrigerator?

Yes, it normally keeps cooling at the last settings. Use a thermometer to make sure they are where you want them, since you cannot adjust them until the keypad is repaired.

What usually gets replaced?

Most often the keypad or control panel, occasionally just the cable. We test each piece, then write down the price before any replacement is made.