Mitsubishi Electric PUHZ-ZRP35VKA Service Manual page 48

Error Code Abnormal points and detection method
Remote controller control board
1 Abnormal if data cannot be normally
read from the nonvolatile memory of the
E1
remote controller control board.
or
(Error code: E1)
E2
2 Abnormal if the clock function of remote
controller cannot be normally operated.
(Error code: E2)
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 Remote controller receives transmitted
data at the same time, compares the
E3
data, and when detecting it, judges
or
different data to be abnormal 30
E5
continuous times. (Error code: E3)
1 Abnormal if indoor controller board could
not find blank of transmission path.
(Error code: E5)
2 Indoor controller board receives
transmitted data at the same time,
compares the data, and when detecting
it, judges different data to be abnormal
30 continuous times. (Error code: E5)
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
unit, indoor controller board could not
E6
receive a signal for 3 minutes from
(6840)
outdoor controller circuit board, a signal
which allows outdoor controller circuit
board to transmit signals.
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if "1" receiving is detected 30
E7
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
(6840)
could not receive anything normally for 3
minutes.
OCH527B
Case
1 Defective remote controller
1 2 remote controller are set as
"main."
(In case of 2 remote controllers)
2 Remote controller is connected
with 2 indoor units or more.
3 Repetition of refrigerant
address
4 Defective transmitting receiving
circuit of remote controller
5 Defective transmitting receiving
circuit of indoor controller board
6 Noise has entered into
transmission wire of remote
controller.
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.
48
Judgment and action
1 Replace remote controller.
1 Set a remote controller to main, and the
other to sub.
2 Remote controller is connected with only one
indoor unit.
3 The address changes to a separate setting.
4~6 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
displayed, noise may be causing
abnormality.
* 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.