Service manual
Table Of Contents
- Important Safety Information
- I. Construction and Refrigeration Circuit Diagram
- II. Sequence of Operation and Service Diagnosis
- III. Controls and Adjustments
- IV. Refrigeration Circuit and Component Service Information
- V. Maintenance
- VI. Preparing the Appliance for Periods of Non-Use
- VII. Disposal
- VIII. Technical Information
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D. Alarm Safeties
Alarm signals are designed to protect the appliance and food product. These alarms
give information or warnings in the event the appliance 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 ashes once every second with audible alarm.
Tosilence the alarm, press and release the upper button.
Alarm Signals
Alarm Code Problem Corrective Action/Reset Details
E01
Cabinet Thermistor Malfunction Alarm
Cabinet thermistor has failed.
Beeps for 10 sec., then silent for 50 sec. To silence
the alarm, press and release the up button.
Appliance cycles 5 min. on, 5 min. off.
E02
Defrost Thermistor Malfunction Alarm
Defrost thermistor has failed.
Beeps for 10 sec., then silent for 50 sec. To silence
the alarm, press and release the up button.
Appliance cycles on and off with cabinet thermistor.
Hi
High Temperature Alarm
Cabinet temperature has remained above
57°F (13.9°C) for more than 2hr.
Beeps for 10 sec., then silent for 50 sec. To silence
the alarm and clear "Hi" from the display, press and
release the up button. The alarm icon stays on.
Automatically resets when temperature returns to
normal.
Lo
Low Temperature Alarm
Cabinet temperature has remained below
20°F (-6.5°C) for more than 2hr.
Beeps for 10 sec., then silent for 50 sec. To silence
the alarm and clear "Lo" from the display, press and
release the up button. The alarm icon stays on.
Automatically resets when temperature returns to
normal.
UHi
High-Voltage Alarm (135VAC
±5% or
more)
The compressor de-energizes if voltage protection
operates. The voltage safeties automatically reset
when voltage is corrected.
ULo
Low-Voltage Alarm (96VAC
±5% or less)
E. Safety Devices
1. Compressor External or Internal Protector
If combined temperature/amperage value is above the limit specied by the
compressor manufacturer, the compressor protector operates independently to turn
off the compressor. The compressor protector de-energizes the compressor until the
temperature/amperage value returns to an acceptable level.
2. High-Pressure Switch (CPT67(-D), CPT93(-D) and all CRES models)
If pressure on the high-side of the appliance exceeds Hoshizaki specications, the
high-pressure switch activates and interrupts the compressor circuit, de-energizing the
compressor until the pressure returns to an acceptable level.
If both the compressor and condenser fan motor are off, it is most likely the appliance is
off or the high-pressure switch has opened. See "VIII.B. Wiring Diagrams."