Troubleshooting Guide
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Only for training and service purposes
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1. Defective temperature sensor con-
nection
2. Defective temperature sensor
(Open / Short)
3. Defective outdoor unit PCB
Error No. Error Type Error Point Main Reasons
Abnormal sensor resistance value
(Open/Short)
Outdoor unit liquid pipe
(condenser) temperature
sensor error
113 (Main)
125 (Sub1)
137 (Sub2)
166 (Sub3)
1. Defective temperature sensor con-
necter connection
2. Defective temperature sensor
(Open/Short)
3. Defective outdoor PCB
Error No. Error Type Error Point Main Reasons
Abnormal sensor resis-
tance value
(Open/Short)
Outdoor unit sub-cooling
inlet / outlet temperature
sensor error
114 (Main sub-cool inlet)
115 (Main sub-cool outlet)
126 (Sub1 sub-cool inlet)
127 (Sub1 sub-cool outlet)
138 (Sub2 sub-cool inlet)
139 (Sub2 sub-cool outlet)
167 Sub3 sub-cool inlet)
168 (Sub3 sub-cool outlet)
■ Error diagnosis and countermeasure flow chart
Is temperature sensor
connector connections
are normal?
Is the value of temperature
sensor resistance normal?*
Check and correct connection
Replace sensor
Replace outdoor unit PCB
Yes
Yes
No
No
* Sensor resistance 100 kΩover (open) or 100 Ω below (short) will generate error
Note: Temperate sensor resistance vary with temperature, So compare temperature sensor resistance value
according to outdoor unit temperature by referring below table (±5% tolerance)
Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ
Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ
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