Hoshizaki HUR40A(-D) - Manual (Page 43)

43
Problem Possible Cause Remedy
[5] Cabinet
temperature too
high.
a) Setpoint and/or
Differential
1. Incorrect. 1. Correct setting(s).
See sections "II.D.2.b)" and
"II.D.3.c)" for defaults.
b) Door 1. Not sealing, opened
frequently or open for
long intervals.
1. Check for sealing, check for
door open at time of warm
cabinet temperature.
c) Defrost 1. Defrost time
insufficient to remove
frost.
Operation in humid
conditions.
1. See "[8] Evaporator does
not defrost completely."
d) Refrigerant 1. Leak. 1. Repair leak and recharge.
e) Fan Motor 1. Defective. 1. Check and replace.
f) Air Filter 1. Clogged. 1. Clean.
g) Condenser 1. Dirty. 1. Clean.
h) Thermistor 1. Defective. 1. Check and replace.
i) Control Board 1. Defective. 1. Replace.
j) Outside Heat Source 1. Too close to unit. 1. Separate unit from heat
source.
k) Air Flow 1. Blockage inside
interior.
1. Remove blocakge by removing
or redistributing food product.
l) Warm Food 1. Warm food recently
placed in refrigerator.
1. Allow time for unit to return to
setpoint temperature.
[6] Cabinet
temperature
display
indicator does
not illuminate
properly.
a) Power Supply 1. "OFF" position. 1. Move to "ON" position.
2. Loose connection(s). 2. Tighten or reconnect.
3. Failure or tripped
breaker.
3. Call electrician and/or reset
breaker.
b) Control Board 1. Defective. 1. Replace.
[7] Cabinet
temperature too
low.
a) Setpoint and/or
Differential
1. Incorrect. 1. Correct setting(s).
See sections "II.D.2.b)" and
"II.D.3.c)" for defaults.
b) Frozen Food 1. Frozen food recently
placed in refrigerator.
1. Allow time for unit to return to
setpoint temperature.
c) Thermistor 1. Defective. 1. Check and replace.
d) Compressor Relay 1. Defective; contacts
welded.
1. Replace.
e) Control Board 1. Defective. 1. Replace.
[8] Evaporator does
not defrost
completely.
a) Defrost Thermistor 1. Defective. 1. Check and replace.
b) Defrost 1. Not enough defrosts
occurring per day.
Operation in humid
conditions.
1. Factory default is once every
6 hours. If coil is frosting too
much, can shorten defrost
interval.
c) Defrost Heaters 1. Defective. 1. Replace heaters.
d) Safety Defrost
Thermostat
1. Defective, turning off
heaters prematurely,
or fused open.
1. Replace safety defrost
thermostat.
e) Defrost Heater
Temperature Fuse
1. Blown. 1. Determine why fuse blew.
Replace fuse.