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Error Code

U-Line Ice Maker Temp Hi 12H+

Use this summary if Temp Hi 12H+ interrupted a U-Line Ice Maker. Orientation: Zone temperature more than 10°F above set point for over 12 hours. Sealed refrigeration and live-board work stay technician-only.

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Reviewed by Ethan Cole · Last reviewed August 11, 2026

Ethan Cole Written by Ethan Cole Appliance Repair Content Specialist Published August 11, 2026 Technically reviewed August 11, 2026
Error code Temp Hi 12H+
Appliance Ice Maker
Affected model series U-Line models in the Ice Maker family that publish fault codes in the user guide
Quick answer

Temp Hi 12H+ · U-Line Ice Maker · Zone temperature more than 10°F above set point for over 12 hours. (platform-dependent).

Model compatibility: U-Line reuses display codes across control platforms, so Temp Hi 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 Hi 12H+ (U-Line ice maker): Zone temperature more than 10°F above set point for over 12 hours. — keep sealed-system work technician-only. If your manual lists a different description for this reading, trust the manual over any general summary.

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

Persistent Temp Hi 12H+ after one careful reset is a technician visit. U-Line Appliance Repair serves U-Line appliances as an independent repair shop.

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.

FAQ

Frequently asked questions

References

Sources & references

  • U-Line product documentation / User Guide & Service Manual families
  • U-Line error/diagnostic code master list v2 (verified)

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.

Book a repair

Tell us what’s wrong — we’ll take it from there

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