Service Diagnosis - Hoshizaki HNC-120AE-L Service Manual

13. SERVICE DIAGNOSIS

13. SERVICE DIAGNOSIS
PROBLEM PROBLEM
[1] Showcase will not [1] Showcase will not
start. start.
[2] Poor cooling [2] Poor cooling
performance performance
[3] Dry foods [3] Dry foods
POSSIBLE CAUSE POSSIBLE CAUSE
1. Ground Fault Cirucit Interrupter in 1. Ground Fault Cirucit Interrupter in
OFF position. OFF position.
2. Unplugged. 2. Unplugged.
3. Supply voltage too low. 3. Supply voltage too low.
4. No power supply to the wall outlet. 4. No power supply to the wall outlet.
(Breaker or fuse blown out.) (Breaker or fuse blown out.)
5. Electrical circuit open or bad 5. Electrical circuit open or bad
contacts. contacts.
6. Motor Protector tripped. 6. Motor Protector tripped.
1. Gas leaks. 1. Gas leaks.
2. Fan Motor defective. 2. Fan Motor defective.
3. Condenser and/or Air Filter 3. Condenser and/or Air Filter
clogged. clogged.
4. Condenser air inlet blocked. 4. Condenser air inlet blocked.
5. Exposed to direct sunlight. 5. Exposed to direct sunlight.
6. Located next to a high heat 6. Located next to a high heat
producing equipment. producing equipment.
7. Doors opened too frequently or 7. Doors opened too frequently or
left open. left open.
8. Packed with foods, or warm or 8. Packed with foods, or warm or
hot foods inside. hot foods inside.
9. Ambient temperature exceeding 9. Ambient temperature exceeding
30°C. 30°C.
1. Foods have been stored from the 1. Foods have been stored from the
previous day. previous day.
2. Foods have been stored for a long 2. Foods have been stored for a long
time. time.
1. Turn ON. 1. Turn ON.
2. Plug in. 2. Plug in.
3. Plug into a separate receptacle 3. Plug into a separate receptacle
of rated voltage ± 10%. of rated voltage ± 10%.
4. Correct. 4. Correct.
5. Correct. 5. Correct.
6. Ventilate and reset Fan Motor. 6. Ventilate and reset Fan Motor.
1. Repair the leaks and recharge. 1. Repair the leaks and recharge.
2. Replace. 2. Replace.
3. Clean. 3. Clean.
4 - 9. Instruct the user on 4 - 9. Instruct the user on
characteristics and proper characteristics and proper
use of the showcase. use of the showcase.
1 - 2. Instruct the user on 1 - 2. Instruct the user on
characteristics and proper characteristics and proper
use of the showcase. use of the showcase.
24 24
REMEDY REMEDY
74NL5870112 74NL5870112