Seeing Temp Lo 12H+ on your U-Line Ice Maker? Start with the non-invasive checks below. Master-list note: Zone temperature more than 10°F below set point for over 12 hours. Exact behavior can differ by platform.
Reviewed by Ethan Cole · Last reviewed August 11, 2026
Written by
Ethan Cole Appliance Repair Content SpecialistPublished August 11, 2026Technically reviewed August 11, 2026
Error codeTemp Lo 12H+
ApplianceIce Maker
Affected model seriesU-Line undercounter Ice Maker controls that show service or alert codes
Quick answer
U-Line Ice Maker · Temp Lo 12H+: Zone temperature more than 10°F below set point for over 12 hours. — verify on your docs.
Model compatibility: U-Line reuses display codes across control platforms, so Temp Lo 12H+ may mean something different on another appliance family or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Temp Lo 12H+ (U-Line ice maker): Zone temperature more than 10°F below set point for over 12 hours. — keep sealed-system work technician-only. Control generations vary across U-Line undercounter lines — photograph the full display and model tag before ordering parts.
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
Record the exact display string shown (including flash patterns)
Record the full U-Line model number from the rating label
Confirm doors/drawers are fully closed and seals are clear of debris
Perform a manufacturer-approved power restart once if safe to do so
Important safety warning. Do not open internal panels, access high-voltage wiring, or attempt sealed refrigeration work. Never bypass safety devices. If you see smoke, sparks, a burning smell, or water near electrical parts, switch the appliance off at the outlet if it is safe to do so and call a professional.
Please avoid
What not to attempt
Do not open internal panels or access high-voltage components
Do not open or attempt to recharge the sealed refrigerant system
Do not bypass door switches, safety devices or interlocks
Do not keep running the appliance if there is water near electrical parts, a burning smell or sparks
Get help
When to call a technician
For recurring Temp Lo 12H+, independent service is safer than guessing parts. U-Line Appliance Repair will diagnose on site and estimate before any repair.
Code still showing?
Get this U-Line fault diagnosed properly
A returning error code usually needs model-specific testing. Book a visit for a clear estimate — no surprise add-ons.
