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TROUBLESHOOTING
1-30
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the alarm code is indicated on the display of the outdoor unit PCB.
This alarm code is indicated when the thermistor is short-circuited (less than 0.24 k
Ω
) or cut (greater
than 840 k
Ω
) during the cooling or heating operation. The system is automatically restarted when the
fault is removed.
Alarm
Code
Abnormality of Thermistor for Indoor Unit Inlet Air Temperature
(Air Inlet Thermistor)
Yes
Yes
Connect it.
No
Faulty Thermistor
Faulty PCB
No
Is it connected to
THM1 (intake) of PCB?
Is resistance of THM1
between 0.24k
Ω
and
840k
Ω
?
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Intake
Air Thermistor
Check resistance.
Replace thermistor
if faulty.
Fault
Check connection.
Repair wiring and
connections.
Incorrect Connection
Replace PCB and
check operation.
Replace PCB if faulty.
Faulty PCB
NOTE:
This data is applicable to the following thermistors;
1. Indoor Unit Discharge Air Temperature, 2. Indoor Unit Liquid Refrigerant Temperature, 3 Indoor Unit
Intake Air Temperature, 4. Outdoor Air Temperature, 5. Outdoor Unit Evaporating Temperature, 6. Indoor
Unit Gas Piping
Indoor Unit
Air Inlet Thermistor
In Case of 4-Way Cassette Type
0
10
20
30
40
50
60
70
80
-15 -10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
82
61
46
35
27
20.5
16
12.5
10
8
5.3
3.6
2.5
90
Ambient Temperature (
o
C)
Thermistor
Resistance
(K
Ω)
Thermistor Characteristics
Содержание Utopia PAS-3HVRG
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