Hoshizaki HNC-120BE-L-BH, Service Manual

9

B. Service Diagnosis

PROBLEM

POSSIBLE CAUSE

REMEDEY

[1] Showcase will not 

start.

1. Power switch (earth leakage circuit 

breaker) in OFF position.

1. Turn ON.

2. Unplugged.

2. Plug in.

3. Supply voltage too low.

3. Plug into a properly earthed, 

independent wall outlet of 220 - 

240V ± 6%.

4. No power supply to the wall outlet. 

(Breaker or fuse blown.)

4. Correct.

5. Electrical circuit open or bad 

contacts.

5. Correct.

6. Motor protector tripped.

6. Allow to cool. If fan motor does not 

energize, replace fan motor.

[2] Poor cooling 

performance

1. Gas leaks.

1. Repair the leaks and recharge.

2. Fan motor defective.

2. Replace.

3. Condenser and/or air filter clogged.

3. Clean.

4. Condenser air inlet blocked.

4 - 9. Instruct the user on 

characteristics and proper use 

of the showcase.

See "II.A. 

Operating Instructions."

5. Exposed to direct sunlight or high 

wattage lamps shining on the case.

6. Located next to a high heat 

producing equipment.

7. Doors opened too frequently or left 

open.

8. Packed with foods, or warm or hot 

foods inside.

9. Ambient temperature exceeding 

30°C.

10. Frost formed.

10. See (*) below for characteristics 

and proper use of the showcase.

[3] Dry foods

1. Foods have been stored from the 

previous day.

1 - 2. Instruct the user on 

characteristics and proper use 

of the showcase.

2. Foods have been stored for a long 

time.

[4] Condensation 

formed.

1. [Exterior] Relative humidity 

exceeding 60%.

1. Wipe off excessive frost with a soft 

cloth.

*  During operation, moisture inside the showcase causes frost to build up on the 

evaporator pipe inside. Frost has an insulating effect on the evaporator pipe and 

reduces refrigeration performance. Every time the door is opened, warm and humid 

air comes in and raises the interior temperature to accelerate frost formation. Opening 

of the doors should be kept to a minimum to maintain proper operating temperatures. 

Do not leave the doors open continuously. Since frost on the evaporator pipe reduces 

refrigeration performance, the showcase cannot be used continuously. After business 

hours, return sushi materials to a refrigerator and turn off the showcase. Leave the 

showcase off for at least 1 to 2 hours to defrost. Failure to defrost the showcase will 

result in improper operating temperatures. In some conditions, frost may build up in a 

short time and reduce cooling performance. In these conditions, defrost the showcase 

as needed during the day. While defrosting the showcase, move sushi materials to a 

refrigerator to prevent deterioration.