Hoshizaki 73183 service manual D. Diagnostic Chart, Unit Not Cooling

D. Diagnostic Chart

Before consulting the diagnostic charts, check the following:

•Check the setpoint. For factory default settings, see "II.C.2.a) Default Settings."

•Make sure the doors are not left open or opened too often and that they are sealing properly.

•Make sure the cabinet is not overloaded with warm or hot product or product blocking airflow. Product should be allowed to cool before putting in the unit.

•Check for correct installation and proper voltage per unit nameplate. This unit is not intended for outdoor use. Normal operating ambient temperature should be within 45°F to 100°F (7°C to 38°C). The unit should not be located next to ovens, grills, or other high heat producing equipment. The unit should be a minimum of 4" (11 cm) from side walls and a minimum of 10" (25 cm) overhead clearance should be provided for proper ventilation.

•Check the control module using the steps in "IV.B. Control Module Check."

1.Unit Not Cooling

Unit Not Cooling - Possible Cause

1.	Power Supply	a) Unplugged, off, blown fuse, or tripped or defective circuit breaker. On
		three-section receptacle box, only top receptacles have power.
		b) Loose connection.
		c) Not within specifications.
2.	Cord and Plug	a) Loose connection.
	On three-section model, check
	receptacle box cord and plug and
		b) Defective.
	one‑section and two-section cords
	and plugs.
3.	Power Switch (control box)	a) "OFF" position.
		b) Bad contacts.
4.	Wiring	a) Loose connection or open.
		b) Faulty.
5.	Control Module	a) In alarm or "- - -" displayed.
	See "II.D.2. Alarm Safeties" and
		b) Defective.
	"IV.B. Control Module Check."
6.	Door Switch	a) Defective.
7.	Door Switch Relay	a) Loose connection.
		b) Bad contacts.
		c) Open coil windings.
8.	Evaporator Fan Motor	a) Defective.
9.	High-Pressure Switch	a) Dirty condenser.
		b) Ambient temperature too warm.
		c) Condenser fan not operating.
		d) Refrigerant overcharge.
		e) Refrigerant lines or components restricted.
		f) Bad contacts.
10.	Compressor Relay	a) Bad contacts.
		b) Open coil windings.

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