U-Line Refrigerator Evap T Open: Evaporator Sensor Circuit Open
Evap T Open means the control sees a broken, open circuit at the evaporator thermistor, the sensor that tracks coil temperature, so it cannot trust the number it receives.
What does U-Line refrigerator & drawers code Evap T Open mean?
Evap T Open is raised by a U-Line refrigerator's digital control when the coil sensor circuit breaks. The evaporator thermistor is the small temperature sensor that watches the cold coil. When the wire path to it is open, as if cut or unplugged, the control no longer gets a usable reading. It reports the open circuit instead of guessing. The message points to the sensor, its connector or its wiring, not to the food or the door. Until the reading comes back, the control cannot manage cooling the way it normally does.
Evap T Open at a glance
- Code
- Evap T Open
- Appliance
- U-Line refrigerator & drawers
- Applies to
- U-Line digital control, coil sensor
- Type
- Needs attention soon
- Can you clear it yourself?
- Sometimes, after the safe checks below
- Most likely cause
- A loose or partly pulled-out connector at the evaporator thermistor
What you may notice with Evap T Open
- Evap T Open appears on the display of the refrigerator
- Cooling may seem uneven or the interior may feel warmer
- Frost may build up on the back wall
- The message returns after you restart the unit
How the refrigerator & drawers detects Evap T Open
A U-Line refrigerator with a digital control keeps cooling steady by reading a few temperature sensors. One of them, the evaporator thermistor, sits at the cold coil. It is a resistor whose value shifts as the coil warms or chills, and the control measures that value many times every minute.
When the circuit to the sensor is open, the control measures no current path at all. A real coil temperature never looks like that, so the control decides the sensor or its wiring has failed and shows Evap T Open. It cannot judge defrost or cooling from the coil without that reading, which is why it reports the problem instead of carrying on blind.
Likely causes of Evap T Open
- A loose or partly pulled-out connector at the evaporator thermistor
- A thermistor sensor that has failed internally and no longer passes current
- A wire to the sensor that has been damaged or broken open
Can you keep using the refrigerator & drawers with Evap T Open?
You can usually leave it plugged in for a short time while you move perishable food to another cold place, since this message is about a sensor and not about gas or heat. Watch the shelf temperature with a thermometer. If the interior keeps warming, or the compressor runs nonstop with no change, switch the unit off and arrange service before food spoils.
What you can safely check
- Before you touch anything, unplug the refrigerator or switch off its breaker so no power reaches the cold coil area.
- Wait about a minute, then restore power and watch whether Evap T Open comes back on the display.
- Look at the contents for frost buildup or warming and note the shelf temperatures with a refrigerator thermometer.
- Do not pull panels or disconnect wiring yourself.
- If the message returns, or the compartment is warming, call us.
What our technician does for Evap T Open
- Test the evaporator thermistor for an open circuit with a meter
- Inspect and reseat the connector and check the wire run for breaks
- Replace the thermistor if its reading is out of range
- Confirm the control reads the coil temperature normally afterward
How to keep Evap T Open from coming back
- Keep the unit clear of stored items pressed against the back wall so wiring is not pinched.
- Avoid pulling the unit out for cleaning without unplugging it first, since tugged cords can loosen connectors.
Technical reference
- Code
- Evap T Open
- Appliance
- U-Line refrigerator & drawers
- Control family
- U-Line digital control, coil sensor
- Maker documentation
- U-Line owner manuals and support
- Checked
- November 2026
Code meanings come from the maker’s documentation and our own repair work; we do not reprint the maker’s document. Confirm the full model number before acting on a code. We are an independent repair company, not affiliated with U-Line Corporation.
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Evap T Open questions
What does Evap T Open mean on a U-Line refrigerator?
It means the control found an open circuit at the evaporator thermistor. The sensor on the cold coil is not returning a usable value, so the control reports the problem rather than rely on a bad reading.
Is Evap T Open the same as the unit being too warm?
No. Evap T Open names a sensor circuit problem, while a warm interior is a separate result. The two can happen together, because the control may cool less well without the coil reading.
Can I fix Evap T Open by restarting the unit?
A restart only clears a one-time glitch. If a connector or wire is the real cause, the message returns soon after. Try one power-down and restart, then stop if the code comes back.
Is Evap T Open the same as Evap T Short?
No. Open means the sensor circuit is broken and carries no current, while Short means the circuit is bridged and reads as too little resistance. Both involve the same sensor, but the wiring problem differs.
What should I tell the repair company about Evap T Open?
Tell us the exact text on the display, when it first appeared and whether the interior feels warmer. Also mention if the unit sits outdoors or in a garage, since that helps us plan the test.
Need help with Evap T Open?
A technician finds the cause at your bar or lanai and puts the price in writing before any part comes out.