Hoshizaki 73183 service manual Alarm Safeties, Alarm Signals, Alarm Code, Problem

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. To silence the alarm, press and release the upper button.

Alarm Signals

Alarm Code	Problem	Corrective Action/Reset Details
	Cabinet Thermistor Malfunction Alarm	Cabinet thermistor disconnected, shorted, or open.
		Check connection and continuity. Reconnect or
E1	Cabinet thermistor has failed.	replace as needed.
		Unit cycles 5 min. on, 5-min. off.
	Defrost Thermistor Malfunction Alarm	Defrost thermistor disconnected, shorted, or open.
E2		Check connection and continuity. Reconnect or
	Defrost thermistor has failed.	replace as needed.
		Unit cycles on and off with cabinet thermistor.
UHi	High-Voltage Alarm (135VAC±5% or	The compressor de-energizes if voltage protection
	more)	operates. The voltage safeties automatically reset
		when voltage is corrected.
ULo	Low-Voltage Alarm (96VAC±5% or less)
	High-Temperature Alarm	First try obvious corrections such as closing doors
	Note: When power is turned on, the	and cleaning the condenser.
	2-hour high-temperature alarm timer is
	bypassed. Therefore, a high-temperature	Automatically resets when temperature returns to
	alarm can occur at startup.	normal.
Hi	Refrigerator: Cabinet temperature has
	exceeded the setpoint temperature by
	10°F (5.6°C) for more than 2 hours.
	Freezer: Cabinet temperature has
	exceeded the setpoint temperature by
	27°F (15°C) for more than 2 hours.
	Low-Temperature Alarm	Automatically resets when temperature returns to
		normal.
Lo	Refrigerator & Freezer: Cabinet
	temperature has remained below the
	setpoint temperature by 8°F (4.4°C) for
	more than 2 hours.
	Communication Error Alarm	Check the connections at the control module
		and the display module. If connections are good,
E13	Communication between the control	the control module and display module must be
	module and the display module has been	replaced.
	interrupted or disconnected.
		The unit operates on a set 5-minutes on, 5-minutes
		off cycle until communication is restored.
	Compressor Off	Unit (compressor) off.
"– – –"		Press and hold the upper and lower buttons until the
		temperature appears on the display.

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