Bunn Ultra NX Maintenance & Troubleshooting Manual

PROBLEM
Blank LCD display screen
Left (or Right) side auger not turning
Left (or Right) side not freezing
Product is very slow to freeze
Lamps in top covers are out
HOW TO
Access Cleaning Guide on LCD Display
Adjust Product Thickness
(This feature may be password protected)
Display Temperature & Torque readings
• Activate/change night time thaw mode
• Activate/change cleaning schedule
• Change Date and Time
Clean REAR Filter Screen
Left Side
MAIN POWER
ON/OFF SWITCH
LEFT DOT SWITCH
AUGER ON SWITCH
AUGER OFF SWITCH
AUGER REFILL ON
ICE CONTROL SWITCH
(Toggles to OFF, ICE, CHILL)
WARNINGS & ERROR MESSAGES
NIGHT MODE
CLEAN DUE TODAY
CLEAN DUE NOW
MONTHLY FILTER CLEAN REQUIRED
FILTER NEEDS CLEANING
!! FILTER NEEDS CLEANING !!
SHAFT SEAL MAINTENANCE DUE
LEFT/RIGHT TEMPERATURE SENSOR
SHORTED/OPEN
• Left/Right Torque Sensor Shorted/Open
• Hot Gas Thermistor Shorted/Open
LEFT/RIGHT REFILL ERROR
(Hopper Lights Flashing)
CHECK RIGHT/LEFT SIDE PRODUCT MIX
OR DRIVE SYSTEM
DEFROST - LEFT/RIGHT BARREL(S) IN
PROCESS OF DEFROSTING
HOPPER LIGHTS FLASHING
Bunn-O-Matic Corporation
58028.0000 A 10/21 © 2021 Bunn-O-Matic Corporation
58028.0000 A Ultra NX Use and Care Instructions.indd 1 58028.0000 A Ultra NX Use and Care Instructions.indd 1
Power cord may be disconnected. Also, press main power switch to the ON position.
Press left (or right) uager toggle switch to start. (Power must be ON).
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).
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.
Check that tops are plugged into base of unit.
If the suggested remedy does not solve the problem, call for help or service.
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.
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.
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.
See "Programming the Dispenser" in the equipment Operating and Service Manual.
These features may be password protected.
Pull Left and Right tab out to remove screen.
Clean with soapy water or compressed air and re-install the screen.
I
O
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.
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)
See above. You must clean for the LCD display to clear.
Clean rear screen with soapy water or compressed air. Press Left Dot button and hold for 3 seconds to clear screen.
Compressor is overheating and will shut down. Clean rear screen and be sure rear of machine has a minimum
4-inch air clearance.
Compressor is running too hot. Service is required.
A reminder that a 12-month Preventive Maintenance is recommended. See Operating manual for further instructions.
Add product to minimum fill line. If warning continues, follow instructions below.
Record Temperature & Torque numbers (see "How to" section above).
Call for service and provide these numbers to the technician.
Press Left Dot button for 3 seconds to clear.
Product thickness not correct. Check product ratio/brix. And/or refill hopper if low.
This will go back to normal operation after defrost is complete.
Hopper is low on product. Refill hopper to clear error.
If unit has Autofill; product BIB may be empty. Replace if needed.
| Post Office Box 3227 | Springfield, Illinois 62708-3227 | Phone (217) 529-6601 | Fax (217) 529-6644
Possible Cause / Remedy
Steps
CENTER DOT
SWITCH
Interpretation / Action To Take
Side 1
Ultra
®
Frozen Beverage Dispenser
Right Side
LCD DISPLAY SCREEN
RIGHT DOT SWITCH
ICE CONTROL SWITCH
(Toggles to OFF, ICE, CHILL)
AUGER ON SWITCH
AUGER OFF SWITCH
AUGER REFILL ON
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10/19/21 11:06 AM 10/19/21 11:06 AM