Viking Undercounter Refrigerator Code E4: Sensor A Thermistor Reads Wrongly

What E4 means

On Viking Professional and Designer undercounter refrigerators with TruProtect control, such as the VUAR1531T, VURD1441D and DUAR1531, E4 reports that the display thermistor, called sensor A, is out of range. That sensor tells the control the cabinet temperature shown to you, so the control may cool by a wrong reading. On dual-zone wine cellars, E4 refers to the lower compartment instead.

Common causes of E4

Display thermistor sensor A out of range
Loose sensor connector
Control board input problem

✓ One safe check you can try

1. Check whether the cabinet feels as cold as the setting. 2. Unplug the unit for a minute and restore power. 3. Reset the code with SET held down and four presses of ON. 4. Keep doors closed. 5. If E4 returns, call us.

! Why to stop there

Judging a sensor by sight does not work
A wrong reading can freeze or warm food
Replacement is simple for a technician but hidden inside the cabinet

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Refrigerator codes

ShrViking Built-In Refrigerator Display Shr: Sensor Circuit Shorted Upper unit openViking Fully Integrated Column Message "Upper unit open": refrigerator door open Upper unit too coldViking Fully Integrated Column Message "Upper unit too cold": refrigerator running colder than set Upper unit too warmViking Fully Integrated Column Message "Upper unit too warm": refrigerator above its setting Power Failure!!Viking Fully Integrated Column Message "Power Failure!!": extended power interruption Power loss indicatorViking 7 Series Integrated Column Indicator: power loss shown on the temperature display Hi/Low Temp / Power Failure / Door Ajar (TruProtect)Viking TruProtect Undercounter Refrigerator Alarms: Hi/Low Temp, Power Failure, Door Ajar HIGH TEMPViking Built-In Refrigerator Message HIGH TEMP: Cabinet Warm for Two Hours

E4E4 questions

What does sensor A control?

It is the display thermistor that senses the cabinet temperature. If it reads out of range, the control cannot cool accurately and shows E4 instead of a temperature.

Is my food safe?

Check the temperature with a thermometer. If it is above 40F, move perishables to another refrigerator or a cooler until we repair it, and keep the door closed as much as you can.

How are E3 and E4 different?

E3 is the evaporator sensor B, E4 is the display sensor A. We test both during a visit, quote the price in writing first and back the work with a 30-day workmanship warranty.