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What do Sub-Zero ice maker codes 40 8 40, 50 U 86 and 50 U 87 mean?
On Sub-Zero Built-In (BI) refrigerators, 40 8 40 means the ice maker ran for its maximum fill time without getting enough water. 50 U 86 means the flow meter detected low flow, and 50 U 87 means it detected no flow. Sub-Zero's manual points to blockages, kinked water lines and low water pressure.
What the code means
Sub-Zero's BI Series service manual lists 40 8 40 as the icemaker running for maximum fill time without achieving the necessary volume, with checks for water system blockages, kinked water lines and proper water pressure. 50 U 86 is "water flow meter detected low flow" (verify water pressure and check for obstructions). 50 U 87 is "water flow meter did not detect flow" (verify water pressure, water flow, and that the meter is not blocked or dirty).
Safe homeowner checks
- Make sure the household water supply valve for the refrigerator is fully open.
- If you recently had plumbing work done or the water was shut off, check that the supply has been restored.
- If part of the supply line is visible without moving the unit, look for kinks.
- Don't pull the refrigerator out of its built-in cabinet or open its water system.
When to call a technician
Call a technician if the code returns after the water supply is confirmed on, or if ice production stays low. Flow meter, valve and in-unit water line checks require a technician.
OEM source
Sub-Zero Built-In (BI) Series Service Manual (serial #4380000 and up), Fault Code Troubleshooting Table, PDF p.302-303: https://service.subzero.com/KnowledgeBase/ManualExternal/134?isInternational=False&t=FAMILY&v=BI&vid=252
Is your Sub-Zero ice maker still short on water? Call Home Alliance at (877) 777-0796 to book a Sub-Zero refrigerator technician. Customers rate us 4.91/5 from 12,574 reviews.
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Trademark disclaimer: Sub-Zero and Wolf are registered trademarks of Sub-Zero Group, Inc. Home Alliance is an independent service provider and is not affiliated with, endorsed by, or an authorized agent of Sub-Zero Group, Inc.. Brand names are used only to identify the appliances we service.
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