Mitsubishi Electric EHGT17D-YM9ED Service Manual page 70

<Display function of inspection for heat pump unit>
The blinking patterns of both LED1 (green) and LED2 (red) on controller circuit board indicate the types of abnormality when it
occurs. Types of abnormality can be indicated in details by connecting an optional part "A-Control Service Tool (PAC-SK52ST)"
to connector CNM on controller circuit board.
[Display]
(1) Normal condition
Unit condition
When the power is turned on
When unit stops
When compressor is warming up
When unit operates
(2) Abnormal condition
Indication
(2) Abnormal condition
Controller circuit board
Indication
LED1 (Green) LED2 (Red)
Controller circuit board
LED1 (Green) LED2 (Red) 1 blinking 2 blinking
1 blinking 2 blinking Connector(63H) is open.
Connector(63H) is open.
Miswiring of FTC/Controller circuit board
2 blinking 1 blinking
connecting wire
2 blinking 1 blinking Miswiring of FTC/Controller circuit board
Miswiring of FTC/Controller circuit
connecting wire
board connecting wire (converse
wiring or disconnection)
Miswiring of FTC/Controller circuit
Startup time over
board connecting wire (converse
wiring or disconnection)
FTC/Controller circuit board communication error
2 blinking
Startup time over
(signal receiving error) is detected by indoor unit.
FTC/Controller circuit board communication error
(transmitting error) is detected by indoor unit.
2 blinking FTC/Controller circuit board communication
FTC/Controller circuit board communication error
error (signal receiving error) is detected by
(signal receiving error) is detected by
FTC.
outdoor unit.
FTC/Controller circuit board communication error
FTC/Controller circuit board communication
(transmitting error) is detected by outdoor unit.
error (transmitting error) is detected by
3 blinking
Remote controller signal receiving
FTC.
error is detected by remote controller.
FTC/Controller circuit board communication
Remote controller transmitting error
is detected by remote controller.
error (signal receiving error) is detected by
Remote controller signal receiving
controller circuit board.
error is detected by FTC.
FTC/Controller circuit board communication
Remote controller transmitting error
error (transmitting error) is detected by
is detected by indoor FTCt.
controller circuit board.
4 blinking
Check code is not defined.
3 blinking Remote controller signal receiving
error is detected by remote controller.
Remote controller transmitting error
Incorrect connection
is detected by remote controller.
Remote controller signal receiving
5 blinking Serial communication error
error is detected by FTC.
<Communication between outdoor
controller board and power outdoor
Remote controller transmitting error
circuit board>
is detected by indoor FTC.
* Check code displayed on remote controller 4 blinking Check code is not defined.
** Refer to service manual for indoor unit.
Incorrect connection
5 blinking Serial communication error
<Communication between controller
circuit board and power circuit board>
* Check code displayed on remote controller
OCH722A
Controller circuit board
LED1 (Green) LED2 (Red)
Lighted Lighted
Lighted Not lighted
Lighted Not lighted
Lighted Lighted
Check
Contents
code*
Contents
1Check if connector (63H) on the controller
F5
2Check continuity of pressure switch (63H) by tester.
1Check if FTC/Controller circuit board connecting wire is
—
2Check if noise entered into FTC/Controller circuit board
—
3Re-check error by turning off power, and on again.
—
E6
1Check if FTC/Controller circuit board connecting wire is connected correctly.
2Check if noise entered into FTC/Controller circuit board connecting wire or
E7
3Check if noise entered into FTC/Controller circuit board controller board.
—
4Re-check error by turning off power, and on again.
—
1Check if connecting wire of FTC or remote controller
E0
E3
2Check if noise entered into transmission wire of remote
E4
3Re-check error by turning off power, and on again.
E5
1Check if noise entered into transmission wire of remote controller.
EF
2Check if noise entered into FTC/Controller circuit board connecting wire.
3Re-check error by turning off power, and on again.
1Connect I/F to the unit.
EE
1Check if connector (CN4) on controller circuit board and
Ed
Check code
00, etc.
08, etc.
C5, H7, etc.
Error
Error
Inspection method
Check
Inspection method
code*
board is not disconnected. 1 Check if connector (63H) on the controller
board is not disconnected.
F5
2 Check continuity of pressure switch (63H) by
tester.
connected correctly.
1 Check if FTC/Controller circuit board
─
connecting wire is connected correctly.
connecting wire or power supply.
2 Check if noise entered into FTC/Controller
circuit board connecting wire or power supply.
─
3 Re-check error by turning off power, and on
again.
─
power supply.
1 Check if FTC/Controller circuit board
E6 connecting wire is connected correctly.
2 Check if noise entered into FTC/Controller
circuit board connecting wire or power supply.
3 Check if noise entered into FTC/Controller
E7
circuit board.
is connected correctly.
4 Re-check error by turning off power, and on
again.
─
controller.
─
1 Check if connecting wire of FTC or remote
E0
controller is connected correctly.
2 Check if noise entered into transmission wire
E3
of remote controller.
3 Re-check error by turning off power, and on
again.
E4
outdoor power circuit board is not disconnected.
E5
1 Check if noise entered into transmission wire
of remote controller.
2 Check if noise entered into FTC/Controller
EF
circuit board connecting wire.
3 Re-check error by turning off power, and on
again.
1 Connect I/F to the unit.
EE
1 Check if connector (CN4) on controller
Ed circuit board and power circuit board is not
disconnected.
70
A-Control Service Tool
Indication of the display
Alternately blinking display
Operation mode
Detailed
Detailed
reference
page
reference
page
—
P.45
—
P46
(EA)
(EA)
(Eb)
(Eb)
(EC)
**
(EC)
**
P.45
(E8)
(E9)
P.45
P.43
P.44
(E8)
P.43
P.44
(E9)
—
P.44
—
P.45
P.44
—
P.45
─
─
─