Haier 1U18BR4EAA Service Manual page 17

8.4Codes and Description
8.4.1.Problem 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 and
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 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
Method of
Method of
Method of The temperatures detected by the thermistors are used to determine thermistor errors
Malfunction
Malfunction
Malfunction
Detection Detection
Detection
Malfunction when the thermistor input is more than 4.92V or less than 0.08V during compressor
Malfunction Malfunction
D c e s i o i n o p r e
Detection D c e s i o i n
Conditions
Conditions
Conditions
Note: The values vary slightly in some models
Supposed
Supposed
Supposed
Causes
Causes
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
Troubleshooting
Check Item
Check the power supply.
Check the indoor PCB
Diagnosis by service
port pressure
operating current.
Check the installation
condition.
Code indication
indoor
E1
E 2
E 4
E 1 4
E1: Room temperature sensor failure
E2: Heat-exchange sensor failure
t a o i . n
Faulty connector connection
Faulty thermistor
Faulty PCB
or else 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
and
Check for insufficient gas.
Check to make sure that the required spaces for
installation (specified in the Technical Guide, etc.) are
provided.
Description
Room temperature sensor failure
H e t a e - c x h a n g e s e s n r o a f
n I d o r o E E P R O M e r r r o
n I d o r o a f n m t o r o m a u f l n
15
Seivice diagnosis
u l i e r
c o i t n
Domestic air conditioner
Reference
Page
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