Domestic air conditioner
8.4Codes and Description
8.4.1.Problem Symptoms and Measures
Symptom
Check Item
Details of Measure
None of the units
operates
Check the power supply.
Check to make sure that the rated voltage is
supplied.
Check the indoor PCB
Check to make sure that the indoor PCB is broken
Equipment
operates but does
not cool, or does
not heat (only for
heat pump)
Diagnosis
by
service
port
pressure
and
operating current.
Check for insufficient gas.
Large
operating
noise
and
vibrations
Check
the
installation
condition.
Check to make sure that the required spaces for
installation (specified in the Technical Guide, etc.) are
provided.
8.4.2 Error Codes and Description indoor display
Code indication
Description
Reference
Page
indoor
Indoor Malfunction
E1
Room temperature sensor failure
19
9
1
e
r
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li
a
f
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o
s
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s
e
g
n
a
h
c
x
e
-
t
a
e
H
2
E
0
2
r
o
r
r
e
M
O
R
P
E
E
r
o
o
d
n
I
4
E
1
2
n
o
i
t
c
n
u
f
l
a
m
r
o
t
o
m
n
a
f
r
o
o
d
n
I
4
1
E
The code indication that is listed above is the main fault
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or else parts damage
may be occurred.
8.4.2.1 Thermistor or Related Abnormality
Indoor Display
E1: Room temperature sensor failure
E2: Heat-exchange sensor failure
Method of
The temperatures detected by the thermistors are used to determine thermistor errors
Malfunction
Detection
Malfunction
when the thermistor input is more than 4.92V or less than 0.08V during compressor
.
n
o
i
t
a
r
e
p
o
n
o
i
s
i
c
e
D
Conditions
Note: The values vary slightly in some models
Supposed
Faulty connector connection
Causes
Faulty thermistor
Faulty PCB
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector,
Seivice diagnosis
15
Method of
Malfunction
Detection
Malfunction
n
o
i
s
i
c
e
D
Conditions
Supposed
Method of
Malfunction
Detection
Malfunction
Detection
Conditions
Supposed
Causes
Troubleshooting
or else parts damage may be occurred.
Summary of Contents for 1U18BR4EAA
Page 4: ... 2 ...
Page 5: ... 3 ...
Page 6: ... 4 ...
Page 7: ... 5 ...
Page 8: ... 6 ...
Page 11: ...Piping diagrams Domestic air conditioner 3 Piping diagrams 9 ...
Page 12: ... ...
Page 21: ...Domestic air conditioner 9 2 heating capacity temp curves 19 Performance Curves Diagram ...
Page 25: ... ...
Page 26: ...1 Removal of outdoor panel 1 ...
Page 27: ...1 Removal of Electrical Box 2 ...
Page 28: ...3 ...
Page 29: ...4 ...
Page 30: ...2 Removal of Electrical Box 5 ...
Page 31: ...6 ...
Page 32: ...9 12 Removal of fan motor bracket and partition 7 ...
Page 33: ...8 ...
Page 34: ...9 13 Removal of compressor and heat exchanger 9 ...
Page 35: ...10 ...
