Tr
oubleshooting
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1. Safety Caution
WARNING
Be sure to turn off all power supplies or disconnect all wires to avoid electric shock before
troubleshooting.
While checking indoor or outdoor PCB, please equip oneself with antistatic gloves or wrist
strap to avoid damage to the board.
2. General Troubleshooting
2.1 Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, the indicator light will flash in a corresponding series, the timer
display may turn on or begin flashing, and an error code will be displayed. These error codes are described in the
following table:
Indicator
flashes
Timer
Display
Display
Error
Information
Solution
1 times
OFF
E1
EEPROM parameter error
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2 times
OFF
E2
Zero-crossing signal detection error
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3 times
OFF
E3
The indoor fan speed is operating outside of the normal range
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5 times
OFF
E5
Indoor room temperature sensor T1 open circuit or short
circuit
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6 times
OFF
E6
Evaporator coil temperature sensor T2 is in open circuit or
has short circuited
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2 times
ON
EC
Refrigerant leak detected
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For other errors:
The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a
temperature reading.
Troubleshooting:
Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement.
If the unit responds, the display board requires replacement.