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2. Alarm Safeties
Alarm signals are designed to protect the unit and food product. These alarms give
information or warnings in the event the unit is operating out of acceptable parameters.
Should one of the alarms occur, follow the instructions in the table below to address the
alarm. The alarm code flashes once every second with audible alarm.
Alarm Code Problem
Cabinet Thermistor Malfunction Alarm
Cabinet thermistor has failed.
E1
Defrost Thermistor Malfunction Alarm
E2
Defrost thermistor has failed.
High Voltage Alarm (135VAC
UHi
more)
ULo
Low Voltage Alarm (96VAC
Communication Error Alarm
Communication between the control
E13
module and the display module has been
interrupted or disconnected.
Compressor Off
"– – –"
Alarm Signals
Corrective Action/Reset Details
Cabinet thermistor disconnected, shorted, or open.
Check connection and continuity. Reconnect or
replace as needed.
E1 flashes with audible alarm every second.
Unit cycles 5 min. on, 5-min. off.
Defrost thermistor disconnected, shorted, or open.
Check connection and continuity. Reconnect or
replace as needed.
E2 flashes with audible alarm every second.
Unit cycles on and off with cabinet thermistor.
±
The compressor de-energizes if voltage protection
5% or
operates. The voltage safeties automatically reset
when voltage is corrected.
±
5% or less)
Check the connections at the control module
and the display module. If connections are good,
the control module and display module must be
replaced.
The unit operates on a set 5-minutes on, 5-minutes
off cycle until communication is restored.
Unit (compressor) off.
Press and hold the upper and lower buttons until the
temperature appears on the display.
17
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