Mitsubishi Electric PUHZ-W50VHA Technical Manual page 79

Error Code Abnormal point and detection method
Remote controller transmission error
(E0)/signal receiving error (E4)
1 Abnormal if main or sub remote con-
troller cannot receive any transmission
normally from FTC of refrigerant address
"0" for 3 minutes.
(Error code: E0)
2 Abnormal if sub-remote controller could
not receive any signal for 2 minutes. (Er-
ror code: E0)
1 Abnormal if FTC can not receive any
E0
data normally from remote controller
or
board or from other Interface/Flow temp.
controller board for 3 minutes. (Error
E4
code: E4)
2 FTC cannot receive any signal from
remote controller for 2 minutes. (Error
code: E4)
Remote controller control board
1 Abnormal if data cannot be read nor-
mally from the nonvolatile memory of the
remote controller control board.
E1
(Error code: E1)
or
2 Abnormal if the clock function of remote
E2
controller cannot be operated normally.
(Error code: E2)
Remote controller transmission error
(E3)/signal receiving error (E5)
1 Abnormal if remote controller could not
fi nd 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 com-
E3
pares these data. Abnormal if the data is
judged to be different for 30 continuous
or
times. (Error code: E3)
E5
1 Abnormal if FTC could not fi nd blank of
transmission path. (Error code: E5)
2 When FTC receives the transmitted data
same time and compares these data. Ab-
normal if the data is judged to be differ-
ent for 30 continuous times. (Error code:
E5)
FTC/outdoor unit communication error
(Signal receiving error)
1 Abnormal if FTC cannot receive any
signal normally for 6 minutes after turning
the power on.
2 Abnormal if FTC cannot receive any
signal normally for 3 minutes.
E6
Cause
1 Contact failure at transmission
wire of remote controller
2 All remote controllers are set
as "sub" remote controller. In
this case, E0 is displayed on
remote controller, and E4 is
displayed at LED (LED1, LED2)
on the outdoor controller circuit
board.
3 Miswiring of remote controller
4 Defective transmitting receiving
circuit of remote controller
5 Noise has entered into the
transmission wire of remote
controller.
1 Defective remote controller
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 FTC
4 Noise has entered into trans-
mission wire of remote control-
ler.
1 Contact failure, short circuit or,
miswiring (converse wiring) of
FTC/outdoor unit connecting
wire
2 Defective transmitting receiving
circuit of FTC
3 Defective transmitting receiving
circuit of FTC
4 Noise has entered into FTC/
outdoor unit connecting wire.
79
Countermeasure
1 Check disconnection or looseness of FTC or
transmission wire of remote controller.
2 Set one of the remote controllers "main", If
there is no problem with the action above.
3 Check wiring of remote controller.
• Total wiring length: max. 500 m
(Do not use cablex 3 or more.)
• The number of connecting remote control-
ler: max. 2 units
When it is not the above-mentioned problem of
1~3
4 Diagnose remote controllers.
a) When "RC OK" is displayed, remote con-
trollers have no problem.
Turn the power off, and on again to check.
If abnormality generates again, replace
PCB of FTC.
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.
1 Replace remote controller.
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 FTC/
outdoor unit connecting wire of FTC or out-
door unit.
2~4 Turn the power off, and on again to
check. If abnormality generates again,
replace FTC or outdoor controller circuit
board.