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Mitsubishi Electric PUHZ-W85VHA Service Manual Page 18

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Abnormal point and detection method
Error Code
Remote controller transmission error
(E3)/signal receiving error (E5)
1 Abnormal if remote controller could not find
blank of transmission path for 6 seconds
and could not transmit.
(Error code: E3)
2 When remote controller receives the
transmitted data same time and compares
these data. Abnormal if the data is judged
to be different for 30 continuous times.
E3
(Error code: E3)
or
1 Abnormal if Interface/Flow temp. controller
E5
board could not find blank of transmission
path. (Error 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 con-
tinuous times. (Error 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.
2 Abnormal if Interface/Flow temp. controller
board cannot receive any signal normally for
E6
3 minutes.
Interface unit/Flow temp. controller-out-
door unit communication error (Signal
receiving error)
(Outdoor unit)
E8
(1) Abnormal if outdoor controller circuit
board could not receive anything
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
E9
times continuously though outdoor con-
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 error code
This code is displayed when non defined
EF
error code is received.
Serial communication error
Abnormal if serial communication between
outdoor controller circuit board and outdoor
power circuit board is defective.
Ed
Case
1 2 remote controllers are set as
"main."
(In case of 2 remote controllers)
2 Defective transmitting receiving
circuit of remote controller
3 Defective transmitting receiving
circuit of Interface/Flow temp.
controller board
4 Noise has entered into trans-
mission wire of remote control-
ler.
1 Contact failure, short circuit or,
miswiring (converse 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 receiving
circuit of Interface/Flow temp.
controller board
4 Noise has entered into
Interface unit/Flow temp. con-
troller-outdoor unit connecting
wire.
1 Contact failure of Interface unit/
Flow temp. controller-outdoor
unit connecting wire
2 Defective communication circuit
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. con-
troller-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 transmission
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
18
Judgment and action
1 Set a remote controller to main, and the
other to sub.
2~4 Diagnose remote controller.
a) When "RC OK" is displayed, remote con-
trollers 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 abnormal-
ity.
* Check LED display on the outdoor control 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 generates 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. con-
troller 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.

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