Mitsubishi Electric PUZ-WZ50VAA Service Manual page 39

Check code Abnormal points and detection method
Remote controller control board
Abnormal if data cannot be normally
E1
read from the nonvolatile memory of the
or
remote controller control board.
E2
(Check code: E1)
(6201
Abnormal if the clock function of remote
or
controller cannot be normally operated.
6202)
(Check code: E2)
Remote controller transmission error (E3)/
signal receiving error (E5)
Abnormal if remote controller could not
find blank of transmission path for 6
seconds and could not transmit.
(Check code: E3)
Remote controller receives transmitted
E3
data at the same time, compares the
or data, and when detecting it, judges
different data to be abnormal 30
E5
continuous times. (Check code: E3)
(6832
or
Abnormal if indoor controller board could
6833)
not find blank of transmission path.
(Check code: E5)
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. (Check code: E5)
Indoor/outdoor unit communication error
(Signal receiving error)
Abnormal if indoor controller board could
not receive any signal normally for 6
minutes after turning the power on.
Abnormal if indoor controller board could
not receive any signal normally for 3
minutes.
Consider the unit as abnormal under
the following condition. When 2 or more
indoor units are connected to an out-
door unit, indoor controller board could
E6
not 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".
OCH816
Cause
Defective remote controller
Duplication of refrigerant
address
Defective transmitting receiving
circuit of remote controller
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into
transmission wire of remote
controller.
Contact failure, short circuit or
miswiring (reversed wiring)of
indoor/outdoor unit connecting
wire.
Defective transmitting receiving
circuit of outdoor controller circuit
board.
Defective transmitting receiving
circuit of indoor controller circuit
board.
Noise has entered into indoor/
outdoor unit connecting wire.
High pressure(High pres-
sure switch 63H operated) or
High compressor temperature
(Thermal protector TRS
operated)
Defective fan motor
Defective rush current resistor
of outdoor power circuit board
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into power
supply
Noise has entered into outdoor
control wire
39
judgment and action
Replace remote controller.
The address changes to a separate setting.
– Diagnose remote controller (PAC-IF011B-E only).
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.
Note: For the controllers other than PAC-
IF011B-E, refer to Installation Manual or
Service Handbook of the indoor unit.
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.
Check disconnecting or looseness of indoor/
outdoor unit connecting wire of indoor unit or
outdoor unit.
Check all the units in the case of twin/triple/
quadruple indoor unit.
– Turn the power off, wait 10 minutes and
on again to check.
If abnormality occurs again, replace indoor
controller board or outdoor controller circuit
board.
Note: Other indoor controller board may have
defect in the case of twin/triple/quadruple
indoor unit system.
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.
Check the rush current resistor on outdoor
power circuit board with tester.
If open is detected, replace the power circuit
board.
– Turn the power off, and on again to
check. If abnormality occurs again,
replace indoor controller board.