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Carrier 38QCR018713 Service Manual Page 61

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  • TROUBLESHOOTING
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Service manual
25
10. Troubleshooting
10.1 Display board
Operation
The indicator flashes once every second after power is on and illuminates when the air conditioner is in
operation.
Timer indicator:
The indicator illuminates then TIMER is set ON.
PRE-DEF. indicator (For cooling & heating mode only)
The air conditioner starts defrosting automatically if outdoor unit frosts in heating operating.
At this time, PRE-DEF. indicator illuminates.
Auto indicator:
This indicator flashes when the air conditioner is in AUTO operation.
ECON indicator
This indicator illuminates while the air conditioner is in economic operation.
10.2 Troubleshooting
For models adopting electrical function:
Failure phenomenon
Operation
lamp
Timer
lamp
Defrosting
lamp
Auto
lamp
Over current protection of the compressor occurs 4
times
☆
☆
☆
☆
Indoor room temp. sensor is open circuit or short circuit
X
☆
X
X
Temp. sensor on indoor evaporator is open circuit or
short circuit
☆
X
X
X
Temp. sensor on outdoor condenser is open circuit or
short circuit (without cooling only models)
X
X
☆
X
Outdoor unit protects(outdoor compressor current,
phase order etc)
X
X
☆
☆
EEROM error
X
☆
X
☆
Indoor unit communication error
X
X
X
☆
Extinguish ☆ Flash at 5Hz
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