Fault Messages - Bunn Ultra NX Service & Repair Manual

User Panel
The following are fault messages that "may" appear on the user LCD display. The issue will need to be
resolved before the message goes away.
The resolution to clear the message / condition are:
a) Instructional Information on Screen - Press Button
b) Self Clears If Condition Goes Away and/or for Over 2 Minutes
c) Self Clears If Condition Goes Away or User Overrides or Next Defrost Cycle is Started
d) Self Clears When Next Defrost Cycle is Started
e) Clears After User Performs a Proper Machine Cleaning
f) Message Appears One Time
FILTER NEEDS CLEANING
Trip Condition: This message appears on the display when the hot gas sensor reads above 205 degrees
fahrenheit for over 5 minutes. Press and hold button for 3 seconds to clear message after the filter has
been cleaned.
Probable Cause: Dirty filter screen.
Clear Condition: a
HOT GAS SENSOR SHORT
Trip Condition: This message appears if the hot gas sensor detects a short.
Probable Cause: Defective hot gas sensor.
Clear Condition: b
HOT GAS SENSOR OPEN
Trip Condition: This message appears if the hot gas sensor is detected as open.
Probable Cause: Defective hot gas sensor or intermittent/open wiring connection between hot gas sensor
and main control board.
Clear Condition: b
TEMPERATURE SENSOR SHORT
Trip Condition: This message appears if the left or right barrel temperature sensor detects a short.
Probable Cause: Defective cooling drum temperature sensor.
Clear Condition: b
TEMPERATURE SENSOR OPEN
Trip Condition: This message appears if the left or right barrel temperature sensor is detected as open.
Probable Cause: Defective cooling drum temperature sensor or intermittent/open wiring connection
between cooling drum temperature sensor and main control board.
Clear Condition: b

FAULT MESSAGES

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