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8.4Codes and Description
8.4.1Problem Symptoms and Measures
Symptom
None of the units
operates
Equipment
operates but does
not cool, or does
not heat (only for
heat pump)
Large
operating
noise
vibrations
8.4.2 Error Codes and Description indoor display
Indoor Malfunction
The code indication that is listed above is the main fault
Troubleshooting
Caution
e sure to turn off power switch before connect or disconnect connector, or else parts damage
B
may be occurred.
8.4.2.1Thermistor or Related Abnormality
Indoor Display
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
Detection
o
Conditions
Supposed
Causes
Yes
Troubleshooting
Check Item
Check the power supply.
Check the indoor PCB
Diagnosis
by
port
pressure
operating current.
Check the installation
and
condition.
Code indication
indoor
E
1
E
2
E
4
E
1
4
E1: Room temperature sensor failure
E2: Heat-exchange sensor failure
p
r e
t a
o i
. n
Note: The values vary slightly in some models
Faulty connector connection
Faulty thermistor
Faulty PCB
* Caution Be sure to turn off power switch before connect or disconnect connector,
parts damage may be occurred.
Details of Measure
Check to make sure that the rated voltage is
supplied.
Check to make sure that the indoor PCB is broken
service
and
Check for insufficient gas.
Check to make sure that the required spaces for
installation (specified in the Technical Guide, etc.) are
provided.
Description
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Domestic air conditioner
Service diagnosis
Reference
Page
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or else
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