Mr Slim A-CONTROL CHECK CODE (U INDICATIONS)

INDICATIONS ON REMOTE CONTROL = U1
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) =
LED2 (RED) =
FAULTS = Unusual high pressure (63H) operated
STANDARD =
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Is ball valve open?
2) Check the indoor/outdoor short cycle

INDICATIONS ON REMOTE CONTROL = U2
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash Once
FAULTS = Discharge temperature is unusual/49C (inner thermostat operated) Refrigerant is insufficient
STANDARD =
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Check whether air filter is dirty to Clean it
2) Confirm whether gas leak or gas shortage occurred
3) Check the indoor/outdoor short cycle

INDICATIONS ON REMOTE CONTROL = U7
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash Once
FAULTS = Superheat occurred by low discharge
STANDARD =
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Has the discharge thermistor seperated?
2) Confirm whether electronic expansion valve has failed
3) Check CN LEV connector on the outdoor board

INDICATIONS ON REMOTE CONTROL = UE
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash Twice
FAULTS = Unusual high-pressure (63H) operated
STANDARD = *
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Is the ball valve open?
2) Check the indoor/outdoor short cycle
3) Is gas overcharged

INDICATIONS ON REMOTE CONTROL = UL
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash Twice
FAULTS = Unusual low-pressure (63L) operated
STANDARD = *
INVERTER =
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Is the ball valve open?
2) Confirm whether gas leak or gas shortage has occurred

INDICATIONS ON REMOTE CONTROL = Ud
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 3 Times
FAULTS = Over raise is protected (overload operation is protected/Fan fault)
STANDARD = *
INVERTER =
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Check whether outdoor heat exchanger is dirty try to Clean it
2) Check the outdoor short cycle

INDICATIONS ON REMOTE CONTROL = U6
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 4 Times
FAULTS = Compressor is intercepted by over-current (overload)
STANDARD = *
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) After turning crank case heater on, have 12 hours or more passed?

INDICATIONS ON REMOTE CONTROL = U6
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 4 Times
FAULTS = Powered module fault occurred
STANDARD =
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = (Replace the outdoor board)

INDICATIONS ON REMOTE CONTROL = UC
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 4 Times
FAULTS = Compressor self protection activated
STANDARD = *
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Is ball valve open?

INDICATIONS ON REMOTE CONTROL = UF
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 4 Times
FAULTS = Compressor is over-current (locked)
STANDARD = *
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Is ball valve open?
2) Is power capacity insufficient?

INDICATIONS ON REMOTE CONTROL = UH
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 4 Times
FAULTS = Current sensor is unusual
STANDARD = *
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) If outdoor board has been replaced: Check wiring and board setting

INDICATIONS ON REMOTE CONTROL = U3
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 5 Times
FAULTS = Discharge thermistor (TH14) is open/short
STANDARD = *
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = TH4 connector on outdoor board seperated

INDICATIONS ON REMOTE CONTROL = U4
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 5 Times
FAULTS = Pipe thermistor (TH3) is open/short
STANDARD = *
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = TH3 connector on outdoor board seperated

INDICATIONS ON REMOTE CONTROL = U4
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 5 Times
FAULTS = 2-phase pipe thermistor (TH6) is open/short
STANDARD =
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = TH6 connector on outdoor board seperated

INDICATIONS ON REMOTE CONTROL = U4
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 5 Times
FAULTS = Outdoor temperature thermistor (TH7) is open/short
STANDARD =
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = TH7 connector on outdoor board seperated

INDICATIONS ON REMOTE CONTROL = U4
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) = Flash 3 Times
LED2 (RED) = Flash 5 Times
FAULTS = Heat dissipation board thermistor (TH8) is open/short
STANDARD =
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = TH8 connector on outdoor board seperated

INDICATIONS ON REMOTE CONTROL = U5
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) =
LED2 (RED) =
FAULTS = Temperature of Heat dissipation board is unusual
STANDARD =
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Is air inlet/air outlet on outdoor unit blocked by an obstruction?

INDICATIONS ON REMOTE CONTROL = UP
INDICATIONS ON OUTDOOR UNIT
LED1 (GREEN) =
LED2 (RED) =
FAULTS = Compressor is intercepted by over-current
STANDARD =
INVERTER = *
DETECTED UNIT = Outdoor Unit
THE PART TO BE CHECKED = 1) Is ball valve open?
2) Is power capacity insufficient

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