42
9. Communication malfunction (AP1 below is control board of the outdoor unit).
Main detection points:
S
Check if the connection wire and the built--in wiring of the indoor and the outdoor unit is connected well and not damaged.
S
Is the communication circuit of the indoor mainboard damaged? Is the communication circuit of the outdoor mainboard (AP1)
damaged?
Malfunction diagnosis process:
Start
Check communication
circuit of outdoor unit
Problem with
communication
circuit
Check built-
in wiring of
indoor and
outdoor unit
Connection
correct?
Malfunction of
circuit is
detected with
control board
AP1 voltage
Check connection
wire of indoor and
outdoor unit with
circuit diagram
Check connection
wire of indoor and
outdoor unit with
circuit diagram
If the unit is operation
normal before malfunction
Yes
N
Y
No
Is the wiring
damaged?
Does the unit operate
normally?
N
Yes
Yes
No
the unit operate
normally?
No
No
No
Replace indoor
board
Replace outdoor
mainboard AP11
If the
malfunction is
removed?
Y
No
Y
No
Y
Yes
End
Yes
Yes
Does
Fig. 45 – Troubleshooting
Summary of Contents for 538FEQ009RBGA
Page 6: ...6 DIMENSIONS OUTDOOR Fig 3 Dimensions Fig 4 Dimensions Fig 5 Dimensions Fig 6 Dimensions...
Page 10: ...10 Outdoor Unit Fig 11 Sizes 09 12...
Page 47: ...47 Shut off power hold both ends of horizontal...
Page 48: ...48...
Page 49: ...49...
Page 50: ...50 ziptie side cutters...
Page 51: ...51...
Page 52: ...52...
Page 53: ...53...
Page 54: ...54...
Page 67: ...67 6 7 8...
Page 68: ...68 9 Remove electric box 10 Remove evaporator...
Page 69: ...69...
Page 70: ...70 11 Remove swing blade...
Page 71: ...71 12 Remove cross flow blade and motor...
Page 72: ...72 13 Remove drive box...
Page 84: ...84 APPENDIX Appendix 1 Reference Sheet of Celsius and Fahrenheit...
Page 89: ...89 UNIT BREAKDOWNS a b c d e...
Page 90: ...90 f g h...
Page 91: ...91...
Page 92: ...92...
Page 93: ...93...