Mitsubishi Electric PUHZ-W50VHA Service Manual page 60

Check Code Abnormal point and detection method
Remote controller transmission error
(E3)/signal receiving error (E5)
1 Abnormal if remote controller could not
find blank of transmission path for 6 sec-
onds and could not transmit.
(Check code: E3)
2 When remote controller receives the
transmitted data same time and com-
pares these data. Abnormal if the data is
E3
judged to be different for 30 continuous
or
times. (Check code: E3)
E5
1 Abnormal if Interface/Flow temp. control-
ler board could not find blank of transmis-
sion path. (Check code: E5)
2 When Interface/Flow temp. controller
receives the transmitted data same time
and compares these data. Abnormal if
the data is judged to be different for 30
continuous times. (Check code: E5)
Interface unit/Flow temp. controller-out-
door unit communication error (Signal
receiving error)
1 Abnormal if Interface/Flow temp.
controller board cannot receive any
signal normally for 6 minutes after
turning the power on.
E6
2 Abnormal if Interface/Flow temp.
controller board cannot receive any
signal normally for 3 minutes.
Interface unit/Flow temp. controller-
outdoor unit communication error
(Signal receiving error)
(Outdoor unit)
(1) Abnormal if outdoor controller circuit
board could not receive anything
E8
normally for 3 minutes.
Interface unit/Flow temp. controller-
outdoor unit communication error
(Transmitting error) (Outdoor unit)
(1) Abnormal if "0" receiving is detected 30
times continuously though outdoor con-
E9
troller circuit board has transmitted "1".
(2) Abnormal if outdoor controller circuit
board could not find blank of transmission
path for 3 minutes.
Non defined check code
This code is displayed when non defined
EF
check code is received.
Serial communication error
Abnormal if serial communication between
outdoor controller circuit board and out-
door power circuit board is defective.
Ed
OCH439M
Cause
1 Refer to the indoor unit's
Installation Manual for remote
controller connection.
2 Defective transmitting receiv-
ing circuit of remote controller
3 Defective transmitting receiv-
ing circuit of Interface/Flow
temp. controller board
4 Noise has entered into trans-
mission wire of remote con-
troller.
1 Contact failure, short circuit or,
miswiring (reverse wiring) of
Interface unit/Flow temp. con-
troller-outdoor unit connecting
wire
2 Defective transmitting receiving
circuit of Interface/Flow temp.
controller board
3 Defective transmitting receiv-
ing circuit of Interface/Flow
temp. controller board
4 Noise has entered into Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
1 Contact failure of Interface
unit/Flow temp. controller-
outdoor unit connecting wire
2 Defective communication cir-
cuit of outdoor controller circuit
board
3 Defective communication
circuit of Interface/Flow temp.
controller board
4 Noise has entered into
Interface unit/Flow temp.
controller-outdoor unit
connecting wire.
1 Interface unit/Flow temp.
controller-outdoor unit
connecting wire has contact
failure.
2 Defective communication circuit
of outdoor controller circuit
board
3 Noise has entered power supply.
4 Noise has entered Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
1 Noise has entered transmis-
sion wire of remote controller.
2 Noise has entered Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
1 Wire disconnection or contact
failure of connector CN2
between the outdoor controller
circuit board and the outdoor
power circuit board
2 Wire disconnection or contact
failure of connector CN4
between the outdoor controller
circuit board and the outdoor
power circuit board
3 Defective communication circuit
of outdoor power circuit board
4 Defective communication circuit
of outdoor controller circuit board
for outdoor power circuit board
60
Judgment and action
1 Refer to the indoor unit's Installation Manual
for remote controller connection.
2–4 Diagnose remote controller.
a) When "RC OK" is displayed, remote
controllers have no problem.
Turn the power off, and on again to
check.
When becoming abnormal again,
replace indoor controller board.
b) When "RC NG" is displayed, replace
remote controller.
c) When "RC E3" or "ERC 00–66" is dis-
played, noise may be causing abnor-
mality.
Note: Check LED display on the outdoor
controller circuit board. (Connect
A-control service tool, PAC-SK52ST.)
1 Check disconnection or looseness of
Interface unit/Flow temp. controller-outdoor
unit connecting wire of Interface unit/Flow
temp. controller or outdoor unit.
2–4 Turn the power off, and on again to
check. If abnormality occurs again,
replace Interface/Flow temp. controller
board or outdoor controller circuit board.
1 Check disconnection or looseness of
Interface unit/Flow temp. controller-outdoor
unit connecting wire of Interface unit/Flow
temp. controller or outdoor unit.
2–4 Turn the power off, and on again to
check. Replace Interface/Flow temp.
controller board or outdoor controller circuit
board if abnormality is displayed again.
1 Check disconnection or looseness of
Interface unit/Flow temp. controller-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.
12 Turn the power off, and on again to check.
Replace Interface/Flow temp. controller
board or outdoor controller circuit board if
abnormality is displayed again.
12 Check connection of each connector CN2
and CN4 between the outdoor controller
circuit board and the outdoor power circuit
board.
3 Replace outdoor power circuit board.
4 Replace outdoor controller circuit board.