Mitsubishi Electric PUHZ-FRP71VHA Service Manual page 36

Error Code Abnormal points and detection method
Indoor/outdoor unit communication
error (Signal receiving error)
1 Abnormal if indoor controller board could
not receive any signal normally for 6
minutes after turning the power on.
2 Abnormal if indoor controller board could
not receive any signal normally for 3
minutes.
3 Consider the unit as abnormal under
the following condition. When 2 or more
indoor units are connected to an outdoor
E6
unit, indoor controller board could not
(6840)
receive a signal for 3 minutes from
outdoor controller circuit board, a signal
which allows outdoor controller circuit
board to transmit signals.
Indoor/outdoor unit communication
error (Transmitting error)
E7 Abnormal if "1" receiving is detected 30
(6842) times continuously though indoor controller
board has transmitted "0".
Indoor/outdoor unit communication
error (Signal receiving error)
(Outdoor unit)
E8
Abnormal if outdoor controller circuit board
(6843)
could not receive anything normally for 3
minutes.
Indoor/outdoor unit communication
error (Transmitting error) (Outdoor unit)
1 Abnormal if "0" receiving is detected 30
E9
times continuously though outdoor con-
(6841)
troller circuit board has transmitted "1".
2 Abnormal if outdoor controller circuit
board could not find blank of transmis-
sion path for 3 minutes.
Reverse connection of ATA/ATW com-
munication wire
Abnormal if communication wire of ATA
side and FTC side are connected in
EE
reverse.
(7130)
Non defined error code
This code is displayed when non defined
error code is received.
EF
(6607
or
6608)
OCH544
Case
1 Contact failure, short circuit or
miswiring (converse wiring) of
indoor/outdoor unit connecting
wire
2 Defective transmitting receiving
circuit of outdoor controller
circuit board.
3 Defective transmitting receiving
circuit of indoor controller
board.
4 Noise has entered into indoor/
outdoor unit connecting wire.
5 Defective fan motor
6 Defective rush current resistor
of outdoor power circuit board
1 Defective transmitting receiving
circuit of indoor controller board
2 Noise has entered into power
supply.
3 Noise has entered into outdoor
control wire.
1 Contact failure of indoor/
outdoor unit connecting wire
2 Defective communication circuit
of outdoor controller circuit
board
3 Defective communication circuit
of indoor controller board
4 Noise has entered into indoor/
outdoor unit connecting wire.
1 Indoor/ outdoor unit connecting
wire has contact failure.
2 Defective communication cir-
cuit of outdoor controller circuit
board
3 Noise has entered power supply.
4 Noise has entered indoor/ out-
door unit connecting wire.
1 Each S1, S2, S3 of TB1 and
TB2 are connected in reverse.
2 The connection from TB1 and
TB2 to indoor controller board
CNS and CNS2 are in reverse.
1 Noise has entered transmission
wire of remote controller.
2 Noise has entered indoor/ out-
door unit connecting wire.
3 Outdoor unit is not a series of
power-inverter.
4 Model name of remote control-
ler is PAR-S25A.
36
Judgment and action
* Check LED display on outdoor controller
circuit board. (Connect A-Control service tool
(PAC-SK52ST))
Refer to EA~EC item if LED displays EA~AC.
1 Check disconnecting or looseness of indoor
/outdoor unit connecting wire of indoor unit
or outdoor unit.
Check all the units in case of twin/triple/
quadruple indoor unit system.
2~4 Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board or outdoor controller
circuit board.
* Other indoor controller board may have defect
in case of twin/triple/quadruple indoor unit
system.
5 Turn the power off, and detach fan motor
from connector (CNF1, 2). Then turn the
power on again.
If abnormality is not displayed, replace fan
motor.
If abnormality is displayed, replace outdoor
controller circuit board.
6 Check the rush current resistor on outdoor
power circuit board with tester. If open is
detected, replace the power circuit board.
1-3 Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor or
outdoor units.
2~4 Turn the power off, and on again to
check. Replace indoor controller board
or outdoor controller circuit board if
abnormality is displayed again.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire.
2~4 Turn the power off, and on again to
check. Replace outdoor controller circuit
board if abnormality is displayed again.
1 Correct the wiring according to 7. WIRING
DIAGRAM.
TB1 — Indoor unit
TB2 — Cylinder/Hydrobox unit
2 Correct the wiring according to 7. WIRING
DIAGRAM.
TB1 — CNS
TB2 — CNS2
12 Turn the power off, and on again to check.
Replace indoor controller board or outdoor
controller circuit board if abnormality is
displayed again.
3 Replace outdoor unit with power-inverter type
outdoor unit.
4 Replace remote controller with MA remote
controller.