--- title: "U-Line error code Temp Hi 12H+" description: "U-Line error code Temp Hi 12H+: The same condition as Temp Hi 6H+ and twice as long: the zone has been ten degrees over its set point for more than" url: "https://ulinemiami.support/error-codes/error-code-temp-hi-12h/" date_modified: "2026-08-30" Appliance type: "Beverage centers, Undercounter refrigerators, Wine coolers" --- # U-Line error code Temp Hi 12H+ ### What Temp Hi 12H+ means, in the maker’s own words The same condition as Temp Hi 6H+ and twice as long: the zone has been ten degrees over its set point for more than twelve hours. The maker publishes both because the second is about the contents rather than the appliance — twelve hours warm is a food question before it is a repair question. On a two-zone cabinet the notification carries (L) or (R) to say which zone it came from; the maker’s own note is that single zone models do not use the left or right indicator at all. ### Quoted rather than interpreted > (L) (R) Temp Hi 12H+ — Left or right zone temperature +10 degrees over set point for over 12 hours. From ERROR NOTIFICATION table, 3000 Series User Guide, in a User Guide & Service Manual downloaded from U-Line’s own site. Nothing on this page is decoded beyond what that sentence says. ### Where this notification actually lives On your display, which on this make is the exception rather than the rule. The 3000 Series does not use the E numbers at all: it watches its inputs continuously and writes the notification on the user interface in plain words, so there is no hidden log to open and no key to hold. Every other U-Line in this catalog does the opposite — it logs the number in memory and shows you nothing but the door. If you are reading a phrase rather than a number, this is the series you own. ### What to do about it - Deal with what is inside first. Twelve hours ten degrees above a refrigeration set point is long enough that the contents are the more expensive loss. - Verify the door is closed and sealing, then look for frost: if excessive frost is also noted, inspect the door and gasket for proper seal and alignment. - Inspect the evaporator fan for proper operation. - Then the refrigeration system itself. A cabinet twelve hours warm with a good door and a running fan is the case where the sealed system is genuinely the answer. ### Where this goes next The job this usually becomes is [diagnostic visit](/services/diagnostic-visit/), and every one of those pages carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 851-2207](tel:+13058512207) and describe what the display is doing before booking anything. **u line temp hi 12h error** names a notification the 3000 Series puts on the display itself, which is what makes it different from every other number this maker logs. 3000 Series only — this series does not use the E numbers What this one means What Temp Hi 12H+ means, in the maker’s own words The same condition as Temp Hi 6H+ and twice as long: the zone has been ten degrees over its set point for more than twelve hours. The maker publishes both because the second is about the contents rather than the appliance — twelve hours warm is a food question before it is a repair question. On a two-zone cabinet the notification carries (L) or (R) to say which zone it came from; the maker’s own note is that single zone models do not use the left or right indicator at all. Quoted rather than interpreted (L) (R) Temp Hi 12H+ — Left or right zone temperature +10 degrees over set point for over 12 hours. From ERROR NOTIFICATION table, 3000 Series User Guide, in a User Guide & Service Manual downloaded from U-Line’s own site. Nothing on this page is decoded beyond what that sentence says. Where this notification actually lives On your display, which on this make is the exception rather than the rule. The 3000 Series does not use the E numbers at all: it watches its inputs continuously and writes the notification on the user interface in plain words, so there is no hidden log to open and no key to hold. Every other U-Line in this catalog does the opposite — it logs the number in memory and shows you nothing but the door. If you are reading a phrase rather than a number, this is the series you own. What to do about it Deal with what is inside first. Twelve hours ten degrees above a refrigeration set point is long enough that the contents are the more expensive loss. Verify the door is closed and sealing, then look for frost: if excessive frost is also noted, inspect the door and gasket for proper seal and alignment. Inspect the evaporator fan for proper operation. Then the refrigeration system itself. A cabinet twelve hours warm with a good door and a running fan is the case where the sealed system is genuinely the answer. Where this goes next The job this usually becomes is diagnostic visit, and every one of those pages carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 851-2207](tel:+13058512207) and describe what the display is doing before booking anything. u line temp hi 12h error names a notification the 3000 Series puts on the display itself, which is what makes it different from every other number this maker logs. --- **[Read full article: U-Line error code Temp Hi 12H+](https://ulinemiami.support/error-codes/error-code-temp-hi-12h/)**