198 to 264 V AC?
Are there looseness or
disconnection of the indoor/
outdoor connecting wire?
Is anything displayed?
17 to 28 V DC?
Is “E8” displayed?
Can all the indoor
unit be operated?
Check the voltage between S2
and S3 on the terminal block of
the outdoor unit.
NO
YES
Not lighting.
Blinking.
NO
YES
NO
YES
Not displayed.
Displayed.
YES
NO
YES
NO
Check the voltage between S1 and S2 on the terminal block
of the indoor unit which is used to connect the indoor unit
and the outdoor unit.
Check the refrigerant address of
the outdoor unit. (SW1-3 to 1-6)
Check the looseness or disconnection
of the indoor/outdoor connecting wire.
Check the LED display of the
outdoor unit after turning on the
main power again.
Can the unit be restarted?
%UHDNLQJRUSRRU
contact of the indoor/
outdoor connecting
wire
)L[WKHEUHDNLQJRUSRRU
contact of the indoor/outdoor
connecting wire.
'HIHFWLYHRXWGRRU
controller circuit
board
5HSODFHWKHRXWGRRU
controller circuit board.
1RUPDO
Only the unit which
has the refrigerant
address “0” supplies
power to the remote
controller
6HWWKHUHIULJHUDQW
address to “0”. In case of
the multiple outdoor units
control, recheck the
refrigerant address again.
'HIHFWLYHLQGRRU
power board
5HSODFHWKHLQGRRU
power board.
'HIHFWLYHRXWGRRU
power circuit board
5HSODFHWKHRXWGRRU
power circuit board.
'HIHFWLYHLQGRRU
controller board
5HSODFHWKHLQGRRUFRQWUROOHU
board of the indoor unit which
does not operate.
'HIHFWLYHRXWGRRU
controller circuit
board
5HSODFHWKHRXWGRRU
controller circuit board.
,QIOXHQFHRI
electromagnetic
noise
1RWDEQRUPDO
There may be the influence
of electromagnetic noise.
Check the transmission wire
and get rid of the causes.
Symptoms: Nothing is displayed on the remote controller.
2
Diagnosis flow
Cause
Inspection method and
troubleshooting
LED display of the indoor
controller board
LED1 :
LED2 :
LED3 : or
Check the status
of the indoor controller
board LED3 display.
Is the refrigerant
address “0”?
NO
YES
NO
YES
Is “EA” or “Eb”
displayed?
OCH651
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