RefrigeratorRepair.center (844) 681-4650Mon–Sat, 8am–8pm Book a visit
The back wall inside the fresh food compartment of a refrigerator, a small temperature sensor clipped beside the air vents, shelves soft in front of it.

U-Line refrigerator
showing Amb Thrm Open

The ambient thermistor circuit is open.

(844) 681-4650

Mon–Sat, 8am–8pm

  • Sensor circuit
  • Controls and sensors
  • Source: U-Line

Book a visit

Three short steps, about a minute.

or call (844) 681-4650

What Amb Thrm Open
actually means.

The ambient thermistor circuit is open. That sensor reads the room around the unit, not the inside of the cabinet. U-Line's instruction is to contact customer care.

U-Line refrigerator display

What to do when Amb Thrm Open shows on the refrigerator

Kind of codeSensor circuit

A temperature sensor reading outside its range, or the wiring to it. The reading is confirmed with a meter before any part is ordered.

Usually leads toControls and sensors

A refrigerator cools to what it believes the temperature is, and a sensor reading wrong is obeyed perfectly.

Shows up asRefrigerator Freezing Food

Lettuce frozen solid and milk with ice in it, in a compartment that is not supposed to freeze.

MakeU-Line

Undercounter refrigeration, ice machines, wine cabinets and beverage centers — almost nothing full-height.

SourceU-Line User Guide & Service Manual, model U-3036RRINT-00B (3000 Series), "Error Notification" table (u-line.com PDF)

U-Line 3000 Series units that show the Error Notification text on the display. On single-zone models the (L) or (R) prefix is left out.

Before you book,
in this order.

Each step comes from U-Line's own guidance for Amb Thrm Open on its refrigerators. Follow it to the end: the last card says whether this is a visit.

01

Write down the message and the model number.

02

Check that the cabinet is still holding its set temperature.

03

Contact U-Line Customer Care.

Still there?

It usually turns into controls and sensors. Book with the code and the model number.

What not to do

It is not a zone sensor message. Those read Zone T Open or Zone T Short. If the display shows Amb Thrm Short instead, the same sensor's circuit is shorted rather than open.

What you may
notice with it.

The refrigerator problems Amb Thrm Open tends to arrive with. Answer these at the refrigerator before anyone is booked.

All problems

Before you call

Refrigerator Freezing Food

All 5 causes, cheapest first

It also comes with

Leafy salad and a carton frozen solid on the top shelf of a refrigerator, ice crystals glittering on them. Problem

Refrigerator Freezing Food

5 causes, cheapest first

Where Amb Thrm Open usually leads

Controls and sensors.

Control board · moderate.
Book a visit What the job involves

Read these
before the visit.

Short guides that make the call quicker and the diagnosis cheaper.

All guides
What you can check yourself

Five observations that narrow a refrigerator problem down before anyone visits

 What you can check yourself

Where the model number hides, and why nothing works without it

 Error codes

All 247 codes, by make

U-Line
refrigerators.

Undercounter refrigeration, ice machines, wine cabinets and beverage centers — almost nothing full-height.

U-Line refrigerator repair

More U-Line codes

No CommZone T OpenZone T ShortTemp Hi 6H+Temp Lo 6H+Door Open 5MºF / ºC symbol flashing

Sensor circuit on other makes

Samsung 5ELG ER rSSub-Zero 10 R 00Viking E3Gaggenau Sensor faultMiele F114Frigidaire OPBertazzoni E1
All 50 codes of this kind
An undercounter refrigerator built into a run of base cabinets below a stone worktop, its ventilation grille at floor level. U-Line builds this

Undercounter refrigerator

A single 15 to 24 inch unit under the worktop — front-vented, tightly enclosed, and easily starved of air.

In U-Line's own words

Amb Thrm Open Ambient thermistor circuit open. Contact Customer Care.
U-Line User Guide & Service Manual, model U-3036RRINT-00B (3000 Series), "Error Notification" table (u-line.com PDF)

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. U-Line 3000 Series units that show the Error Notification text on the display. On single-zone models the (L) or (R) prefix is left out.

U-Line Amb Thrm Open refrigerator repair,
where we come out.

The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered.

All service areas

Tampa BayFL · 31 areas

OrlandoFL · 30 areas

Miami / South FloridaFL · 47 areas

New York MetroNY · 75 areas

HoustonTX · 36 areas

ChicagoIL · 50 areas

Los AngelesCA · 95 areas

San DiegoCA · 31 areas

San Francisco Bay AreaCA · 74 areas

A family preparing a meal together in their kitchen
For the heart of your home.

Questions
about Amb Thrm Open.

Can I clear Amb Thrm Open myself?
Write down the message and the model number. If it comes back, it needs a visit.
Does Amb Thrm Open mean my U-Line cabinet is warming?
Not by itself. The ambient thermistor reads the room around the unit, not the inside. Confirm the cabinet is still at its set temperature and then contact customer care.
What is the difference between Amb Thrm Open and Amb Thrm Short on a U-Line?
Both concern the same ambient sensor: open means its circuit reads broken, short means it reads shorted. Zone sensors report under Zone T Open or Zone T Short instead. Either ambient message goes to U-Line Customer Care.

Back to your everyday

Still showing Amb Thrm Open?

Book with the exact characters, the full model number, and whether it is still cooling — on a code, that is the whole starting point.

Schedule a repair Call (844) 681-4650
(844) 681-4650 Schedule a repair