Viking Undercounter Ice Machine Code 2 Flashes: bin sensor open or shorted

What 2 Flashes means

On Viking Professional and Designer 15-inch undercounter ice machines in the VUIM, DUIM and DFIM 150 series, such as the VUIM150D and DUIM150D, two flashes of the diagnostic LED mean the bin sensor, the bin thermistor, is open or shorted. The control reads the bin sensor to know when the bin is full, so with a bad reading it may stop making ice or run when it should not.

Common causes of 2 Flashes

Bin thermistor open
Bin thermistor shorted
Loose or damaged sensor connector

✓ One safe check you can try

1. Check that the ice bin is seated and nothing blocks the sensor area at the back of the bin. 2. Remove the ice, wipe the bin and wipe up any water. 3. Switch the machine off at its breaker for a few minutes, then restore it. 4. If the LED still blinks twice, call us. Do not reach into the evaporator area.

! Why to stop there

The thermistor sits in the cold section behind the bin
Telling an open from a shorted sensor needs a meter
We quote first in writing and give a 30-day warranty

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 Ice Machine codes

3 FlashesViking Undercounter Ice Machine Code 3 Flashes: evaporator sensor open or shorted 4 FlashesViking Undercounter Ice Machine Code 4 Flashes: bin and evaporator sensors both reported Check Water light (flashing blue)Viking Ice Machine Check Water Light Flashing Blue: No Water Supply CL (alternating with ICE)Viking Clear-Ice Machine Display CL and ICE: Time for a Cleaning Diagnostic LED: 2+3 blinksViking Beverage Center Ice Maker LED 2 Blinks, Pause, 3 Blinks: Both Thermistors Out of Range Diagnostic LED: 2 blinksViking Beverage Center Ice Maker LED 2 Blinks: Defrost Thermistor Reading Is Off Diagnostic LED: 3 blinksViking Beverage Center Ice Maker LED 3 Blinks: The Evaporator Thermistor Reads Wrongly Diagnostic LED: 4 blinksViking Beverage Center Ice Maker LED 4 Blinks: Potentiometer Signal Is Out of Range

2 Flashes2 Flashes questions

What does the diagnostic LED show?

It blinks a number of times, then pauses, and repeats. Two blinks point to the bin sensor, which tells the control how full the bin is.

Will the machine still make ice?

It might run on a wrong reading, either making too little or not stopping when the bin is full. Turn it off if ice is spilling or the bin is overfull.

Is this the same on other Viking ice products?

No. On Viking beverage center ice makers, two blinks can mean a different sensor. Match the code to your 150 series model before you compare.