Hoshizaki HR24A Manuel D’Utilisation

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Before consulting the diagnostic charts, check the following:
• Check the cabinet temperature setpoint and factory default settings. For factory default 

settings, see "II.D. Cabinet Temperature" and "II.H. Service Menu."

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

properly.

• Make sure product is not blocking airflow and that the cabinet is not overloaded with 

warm or hot product. Product should be allowed to cool before putting in the appliance.

• Check for correct installation and proper voltage per appliance nameplate. This 

appliance is approved for indoor or outdoor use. Normal operating ambient temperature 
should be within 61°F to 95°F (16°C to 35°C). 

• The appliance should not be located next to ovens, grills, or other high heat producing 

equipment or exposed to direct sunlight. 

• The appliance must have a minimum of 1" (3 cm) clearance at bottom and top. Air must 

be able to circulate freely under, behind, and above the appliance.

• Check the control board using the steps in "IV.B. Control Board Check." 

1. Power Supply

a) Unplugged, off, blown fuse, or tripped or defective breaker. 
b) Loose connection.

c) Not within specifications.

2. Cord and Plug

a) Loose connection.
b) Defective.

3. Wiring

a) Loose connection or open.
b) Faulty.

4. Power Button (control board)

a) Turned "OFF." 
b) Defective.

5. Control Board and Display Module

See "II.G. Alarm Safeties."
and "IV.B. Control Board Check."

a) In alarm.
b) Defective.

6. Door Switch 

a) Door open.
b) Defective.

7. Evaporator Fan Motor

a) Fan blade binding.
b) Defective.

8. Compressor

a) Compressor external protector open or defective.
b) Motor winding open.

c) PTC relay contacts bad or coil winding open.

d) Inefficient.

9. Condenser

a) Dirty.

10. Evaporator

a) Dirty or frozen up.

11. Refrigerant/Refrigerant  Lines

a) Gas leak, low charge.
b) Refrigerant lines restricted.