1B. Cabinet Control Module: 4A7053-01; Safety Devices - Hoshizaki Steelheart Series Service Manual

1b. Cabinet Control Module: 4A7053-01

PR46B: M50053H-M50072H
PR60B: M50008H-M50024H
Alarm Code Problem
Cabinet Thermistor Malfunction Alarm
Cabinet thermistor has failed.
E01
High Temperature Alarm
Cabinet temperature has remained above
57°F (13.9°C) for more than 1 hour.
Hi
Low Temperature Alarm
Cabinet temperature has remained below
20°F (-6.6°C) for more than 1 hour.
Lo
E. Safety Devices
1. Compressor External Protector
If combined temperature/amperage value is above the limit specified by the compressor
manufacturer, the compressor external protector operates independently to turn off the
compressor. The compressor external protector de-energizes the compressor until the
temperature/amperage value returns to an acceptable level.
2. Short-Cycle Protection
There is a 2-min. minimum off-time and on-time for the compressor.
Note: Time may vary with compressor overload activation.
Alarm Signals
Corrective Action/Reset Details
Check Cabinet Thermistor.
"E01" flashes. Alarm icon flashes.
Cabinet Fan(s) cycle 5 min. on, 5 min. off.
E01 - Cabinet thermistor out of place, open or
shorted.
Check for open doors/drawers, dirty air filter and/or
condenser.
"Hi" and temperature alternates flashing. Alarm icon
flashes.
Automatically resets when temperature returns to
normal.
Check Rail Control Module, Rail Thermistor, and Rail
Light Sensor.
"Lo" and temperature alternates flashing. Alarm icon
flashes.
Automatically resets when temperature returns to
normal.
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