Side 1
Bunn-O-Matic Corporation
| Post Office Box 3227 | Springfield, Illinois 62708-3227 | Phone (217) 529-6601 | Fax (217) 529-6644
Ultra
®
NX
Frozen Beverage Dispenser
PROBLEM
Possible Cause / Remedy
Blank LCD display screen
Power cord may be disconnected. Also, press main power switch to the ON position.
Left (or Right) side auger not turning
Press left (or right) uager toggle switch to start. (Power must be ON).
Left (or Right) side not freezing
1) Left (Right) side auger must be turning.
2) Press left (or right) ice control switch until the display reads “ICE”.
3) Adjust product thickness (See “How-to” box below or the manual).
Product is very slow to freeze
1) Check that rear of machine has a 4-inch minimum air clearance.
2) Clean rear screen with soapy water or compressed air.
3) Deflect away any warm air from nearby equipment.
Lamps in top covers are out
Check that tops are plugged into base of unit.
HOW TO
Steps
Access Cleaning Guide on LCD Display
Press and hold the Center Dot switch for 5 seconds. When “Cleaning Guide” is displayed, press the Right Dot
switch to select YES. Then select the Center Dot switch to step through the 9 instructional screen displays.
Adjust Product Thickness
(This feature may be password protected)
Press and hold the Center Dot switch for 5 seconds. When “Cleaning Guide” is displayed, press the Left Dot
switch to select NO. The screen will then display “Set Thickness?” Select YES (the Right Dot switch) to display
thickness scale for the LEFT hopper. Move the scale up or down using the Left Dot and Right Dot switches
(minimum is 1; maximum is 16). Then press the Center Dot switch to display thickness setting for the RIGHT
hopper. Adjust as necessary. Display will time-out and return to home screen after 60 seconds.
Display Temperature & Torque readings
This provides valuable information to a technician and helps to determine whether a problem is in the
refrigeration system or mechanical in nature. Simultaneously press and hold the Left Dot and Right Dot
switches for 5 seconds. The top number displayed is the auger torque reading for each cooling drum.
The bottom number toggles between the cooling drum temperature and the hot gas temperature. Record
all three numbers for each drum before calling for service. Simultaneously press and release the Left Dot
and Right Dot switches to return to the home screen.
• Activate/change night time thaw mode
• Activate/change cleaning schedule
• Change Date and Time
See “Programming the Dispenser” in the equipment Operating and Service Manual.
These features may be password protected.
Clean REAR Filter Screen
Pull Left and Right tab out to remove screen.
Clean with soapy water or compressed air and re-install the screen.
If the suggested remedy does not solve the problem, call for help or service.
RIGHT DOT SWITCH
LCD DISPLAY SCREEN
ICE CONTROL SWITCH
(Toggles to OFF, ICE, CHILL)
AUGER ON SWITCH
AUGER OFF SWITCH
AUGER REFILL ON
I
O
Right Side
CENTER DOT
SWITCH
LEFT DOT SWITCH
ICE CONTROL SWITCH
(Toggles to OFF, ICE, CHILL)
AUGER ON SWITCH
AUGER OFF SWITCH
AUGER REFILL ON
Left Side
MAIN POWER
ON/OFF SWITCH
WARNINGS & ERROR MESSAGES
Interpretation / Action To Take
NIGHT MODE
It is recommended that the product in the dispenser be thawed each day, usually overnight. The ice granules get too
large and a consistent product is difficult to maintain if left frozen too long. The machine will automatically return to
normal freeze mode at the programmed time. To change this setting, check the Operating & Service Manual.
CLEAN DUE TODAY
Follow cleaning procedure on the Cleaning Card or access the one on the display window.
(See Access Cleaning Guide on LCD Screen in “How to” section above)
CLEAN DUE NOW
See above. You must clean for the LCD display to clear.
MONTHLY FILTER CLEAN REQUIRED
Clean rear screen with soapy water or compressed air. Press Left Dot button and hold for 3 seconds to clear screen.
FILTER NEEDS CLEANING
Compressor is overheating and will shut down. Clean rear screen and be sure rear of machine has a minimum
4-inch air clearance.
!! FILTER NEEDS CLEANING !!
Compressor is running too hot. Service is required.
SHAFT SEAL MAINTENANCE DUE
A reminder that a 12-month Preventive Maintenance is recommended. See Operating manual for further instructions.
LEFT/RIGHT TEMPERATURE SENSOR
SHORTED/OPEN
Add product to minimum fill line. If warning continues, follow instructions below.
• Left/Right Torque Sensor Shorted/Open
• Hot Gas Thermistor Shorted/Open
Record Temperature & Torque numbers (see “How to” section above).
Call for service and provide these numbers to the technician.
LEFT/RIGHT REFILL ERROR
(Hopper Lights Flashing)
Press Left Dot button for 3 seconds to clear.
CHECK RIGHT/LEFT SIDE PRODUCT MIX
OR DRIVE SYSTEM
Product thickness not correct. Check product ratio/brix. And/or refill hopper if low.
DEFROST - LEFT/RIGHT BARREL(S) IN
PROCESS OF DEFROSTING
This will go back to normal operation after defrost is complete.
HOPPER LIGHTS FLASHING
Hopper is low on product. Refill hopper to clear error.
If unit has Autofill; product BIB may be empty. Replace if needed.
Maintenance &
Troubleshooting Guide
www.bunn.com
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58028.0000 A Ultra NX Use and Care Instructions.indd 1
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