Booking today · Miami, Los Angeles, Houston, New York and San Diego · three-hour arrival windows Independent commercial equipment repair · Every maker on this site Mon–Fri 7:00 AM - 8:00 PM · Sat 8:00 AM - 6:00 PM
(844) 393-0816 Schedule a Visit
Error code · BUNN · Slush & frozen drinks

BUNN Slush Machine Message CHECK PRODUCT MIX OR DRIVE SYSTEM

CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVE SYSTEM means the product thickness is not correct. Check the product ratio or brix, and refill the hopper if it is low.

Medium · inspection needed

Medium: the product is out of range, and the first checks are simple.

Schedule a Visit(844) 393-0816
Code
CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVE SYSTEM
Maker
BUNN
Equipment
Slush & frozen drinks
Applies to
Ultra NX frozen beverage dispenser

What does BUNN CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVE mean?

The Ultra NX dispenser judges the thickness of the slush partly by how hard the auger has to work. If the product is too thick or too thin for the setting, the control displays CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVE SYSTEM. The Use and Care Guide says the product thickness is not correct and gives two actions: check the product ratio or brix, and refill the hopper if it is low. Brix is the sugar content of the mix, and the machine freezes properly only within a narrow range. Too little sugar makes a hard, icy product, and too much stays too soft. A hopper that is low can also allow the barrel to run short. Mix that has been diluted with melted ice or topped up with plain water changes the ratio without anyone noticing, which is a frequent reason for this message. The guide lists no part failures, but the words drive system hint that if the mix is right and the hopper is full, the auger drive should be looked at by a technician.

Affected models and control systems

BUNN Ultra NX frozen beverage dispensers. Other BUNN frozen drink machines use different messages.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

  • Check product mix or drive system message on the display
  • Slush too thick or too thin
  • Auger sounds strained

Possible causes

Likely causes — what usually sits behind CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVE on this control. A technician confirms which one it is before any part is replaced.

  • Mix measured by guess instead of a refractometer
  • Water added to the hopper in the wrong ratio
  • Auger drive slipping under load

Safe checks before calling for service

✓ What an operator can do
  1. Check the mix ratio against the product instructions.
  2. Measure the brix if you have a refractometer.
  3. Refill the hopper if it is low.
  4. If the message returns with a correct mix, note the side and tell the technician.

How a technician diagnoses CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVE

  1. Read the message and note the side.
  2. Check the brix of the product in the barrel.
  3. Verify the hopper level and refill operation.
  4. Check the auger drive and torque readings.
  5. Replace the part that fails.
! Leave this to a technician
  • The auger drive is a moving mechanical part.
  • Torque and temperature readings need the control menus.
  • A frozen-solid barrel can strain the drive.

How CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVE differs from similar codes

This message is about product thickness. The SENSOR SHORTED/OPEN message is about a failed sensor.

Technical reference

Maker documentation
BUNN owner support
Edition
58028.0000 B 2/22
Models / control
Ultra NX frozen beverage dispenser
Section
Warnings & Error Messages table, side 1
Checked
October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.

→Same maker

Related BUNN slush & frozen drink error codes

FILTER NEEDS !!!CLEANING!!!Bunn Slush Machine FILTER NEEDS !!!CLEANING!!!: Freezing StoppedFILTER NEEDS CLEANINGBunn Slush Machine FILTER NEEDS CLEANING: Refrigeration Running Hot!! FILTER NEEDS CLEANING !!BUNN Slush Machine Message !! FILTER NEEDS CLEANING !!: Compressor Too HotCLEAN DUE NOWBUNN Slush Machine Message CLEAN DUE NOW: Cleaning OverdueCLEAN DUE TODAYBUNN Slush Machine Message CLEAN DUE TODAY: Daily Cleaning ReminderDEFROST - LEFT/RIGHT BARREL(S) IN PROCESS OF DEFROSTINGBUNN Slush Machine Message DEFROST: Barrel In Process of DefrostingHOPPER LIGHTS FLASHINGBUNN Slush Machine Message HOPPER LIGHTS FLASHING: Low ProductLEFT/RIGHT REFILL ERROR (Hopper Lights Flashing)BUNN Slush Machine Message LEFT/RIGHT REFILL ERROR: Hopper Lights FlashingLEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPENBUNN Slush Machine Message LEFT/RIGHT TEMPERATURE SENSOR SHORTED/OPENNIGHT MODEBUNN Slush Machine Message NIGHT MODE: Overnight ThawSHAFT SEAL MAINTENANCE DUEBUNN Slush Machine Message SHAFT SEAL MAINTENANCE DUEMONTHLY FILTER CLEAN REQUIREDBunn Slush Machine MONTHLY FILTER CLEAN REQUIRED: Cleaning Reminder
CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVEQuestions about BUNN CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVE
What is brix?

The sugar content of the mix. The machine needs it in range to freeze correctly.

Can bad mix break the machine?

It can overload the drive if the product freezes too hard, and it makes poor quality drinks even when nothing is damaged. Mixing by the book each time avoids most of it.

Is it a drive problem?

Only if the mix is right and the hopper is full. The words drive system in the message are a pointer for the technician, so measure the brix before you call.

Book a visit

Need help with BUNN CHECK RIGHT/LEFT SIDE PRODUCT MIX OR DRIVE?

A technician confirms the cause on site and gives you the price in writing before any work starts.

(844) 393-0816
Open the booking form
☎ Call our office ▤ Schedule a Visit