Hoshizaki HFE-140B Series, Service Manual

Page: 33 / 52

30
III. SER
VICE DIAGNOSIS
1. ERROR CODES
In
case
of
trouble,
the
Temperature
Display
Window
indicates
the
cabinet
temperature
and
the
applicable
error
code
alternately
every
second (even in a defrost cycle).
Except EA
and Ed, there is no need to restart the unit to reset errors.
Code
Error
Description
Possible Cause
Reset
Component
Condition
E1
Cabinet
Temp
Too High
Cabinet temp stays
0K above
set point for 2 hrs (available after power is turned on and cabinet temp drops to lower limit).
- Compressor control error - Compressor defective - Refrigeration circuit defective (ex. gas leak) - Interior
Thermistor
defective
- Ambient temp too high - Gap between Door and cabinet - Door opened too
frequently
- T
oo many warm items inside
Press Reset Button. Automatically resets when cabinet temp drops to lower limit.
E2
Cabinet
Temp
Too Low
Cabinet temp stays 5K below set point for
hr
.
- Compressor control error - Interior
Thermistor
defective
- A
m
bi
en
t t
em
p
to
o
lo
w
- T
oo many frozen items inside
Press Reset Button. Automatically resets when cabinet temp rises to upper limit.
E3
Defrost Cycle Too Long (HFE series only)
Defrost Heater remains energized for
hr and is forcibly
de-energized.
- Heater control error - Heater defective - Thermal Fuse circuit
open - Defrost
Thermistor
defective
- Door opened too
frequently
, causing
excessive Evaporator frosting
Pr
es
s
R
es
et
B
ut
to
n
(n
o
automatic reset).
E4
Abnormal High-Side Pressure
High pressure is detected 5 or more times in
hr (4 times
within
hr after
st detection).
Clog
Thermistor
* See table below for set point.
- Condenser Fan Motor
defective
- Dirty
Air Filter
- Clog
Thermistor
defective
- Ambient temp too high
Pr
es
s
R
es
et
B
ut
to
n
(n
o
automatic reset).