Hoshizaki 1800ALKE(-N), Service Manual

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130
PROBLEM POSSIBLE CAUSE REMEDY
[3] (Continued) d) Pressure switch,
condenser
thermistor
1. Dirty condenser fins. 1. Clean.
2. Ambient temperature
too warm.
2. Check for recommended
temperature.
3. Fan not rotating. 3. Replace.
4. Condenser water
pressure too low or off.
4. Check and get recommended
pressure.
5. Water regulating valve
clogged.
5. Clean.
6. Refrigerant
overcharged.
6. Recharge.
7. Refrigerant line or
components plugged.
7. Clean and replace drier.
8. Bad contacts. 8. Check for continuity and
replace.
9. Loose connections. 9. Tighten.
e) Thermostat
(water-cooled
model)
1. Ambient temperature
too warm.
1. Check for recommended
temperature.
2. Compressor cooling
fan motor defective.
2. Replace.
3. Bad contacts. 3. Check for continuity and
replace.
4. Loose connections. 4. Tighten.
f) Gear motor
protect relay
1. Coil winding opened. 1. Replace.
2. Bad contacts. 2. Check for continuity and
replace.
[4] Gear motor
starts, but
compressor will
not start or
operates
intermittently.
a) X4 relay
(controller board)
1. Bad contacts. 1. Check for continuity and
replace controller board.
2. Coil winding opened. 2. Replace controller board.
b) X6 relay 1. Bad contacts. 1. Check for continuity and
replace X6 relay.
2. Coil winding opened. 2. Replace X6 relay.
b) Compressor 1. Loose connections. 1. Tighten.
2. Motor winding opened
or earthed.
2. Replace.
3. Motor protector
tripped.
3. Find out the cause of overheat
or overcurrent.
c) Power supply 1. Circuit ampacity too
low.
1. Install a larger-sized
conductor.
d) Controller board 1. Defective. 1. Replace
e) Start capacitor or
run capacitor
1. Defective. 1. Replace
[5] Gear motor and
compressor
start, but no ice
is produced.
a) Refrigerant line 1. Gas leaks. 1. Check for leaks with a leak
detector. Reweld leak, replace
drier and charge with
refrigerant. The amount of
refrigerant is marked on
nameplate or label.
2. Refrigerant line
clogged.
2. Replace the clogged
component.