Mitsubishi Electric Mr.Slim PLA-RP3AA Service Manual page 29

Error Code Meaning of error code and detection method
Abnormality of pipe temperature ther-
mistor / Condenser-Evaporator (TH5)
1 The unit is in three-minute resume pro-
tection mode if short/open of thermistor
is detected. Abnormal if the unit does
not get back to normal within three min-
utes. (The unit returns to normal opera-
tion, if it has normally reset.)
2 Constantly detected during cooling, dry-
ing, and heating operation (except
defrosting)
Short: 90: or more
Open: -40: or less
P9
Remote controller signal receiving error
1 Abnormal if indoor control p.c. board can
not receive normally any data from
remote controller or from other indoor
control p.c. board for three minutes.
2 Indoor control p.c. board cannot receive
any signal from remote controller for two
minutes.
E4
Remote controller transmitting error
1 Abnormal if indoor control p.c. board
cannot check the blank of transmission
E5 path for three minutes.
2 Abnormal if indoor control p.c. board
cannot finish transmitting 30 times
consecutively.
Indoor/outdoor unit communication
error (Signal receiving error)
1 Abnormal if indoor control p.c. board
cannot receive any signal normally for
six minutes after putting the power on.
2 Abnormal if indoor control p.c. board
cannot receive any signal normally for
E6 three minutes.
3 Consider the unit abnormal under the
e6
( )
following condition: When two or more
indoor units are connected to one out-
door unit, indoor control p.c. board can-
not receive a signal for three minutes
from outdoor control p.c. board, a signal
which allows outdoor controller board to
transmit signals.
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if "1" receiving is detected 30
times continuously though indoor control
E7
p.c. board has transmitted "0".
Case
1 Defective thermistor character-
istics
2 Contact failure of connector
(Insert failure)
3 Breaking of wire or contact fail-
ure of thermistor wiring
4 Temperature of thermistor is
90: or more or -40: or less
caused by defective refrigerant
circuit.
5 Defective indoor control p.c.
board
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 outdoor LED.
3 Defective transmitting receiving
circuit of remote controller
4 Defective transmitting receiving
circuit of indoor control p.c.
board
5 Noise has entered into the
transmission wire of remote
controller.
1 Defective transmitting receiving
circuit of indoor control p.c.
board
2 Noise has entered into the
transmittion wire of remote
controller.
1 Contact failure, short circuit or,
mis-wiring (converse wiring) of
indoor/outdoor unit connecting
wire
2 Defective transmitting receiving
circuit of indoor control p.c.
board
3 Defective transmitting receiving
circuit of indoor control p.c.
board
4 Noise has entered into
indoor/outdoor unit connecting
wire.
1 Defective transmitting receiving
circuit of indoor control p.c.
board
2 Noise has entered into power
supply.
3 Noise has entered into outdoor
control wire.
29
Judgment and action
1–3 Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2 Check contact failure of connector
Put the power on and check restart after
inserting connector again.
4 Operate in test run mode and check pipe
<condenser- evaporator> temperature with
outdoor control p.c. board. If pipe <con-
denser-evaporator> temperature is exclu-
sively low (in cooling mode) or high (in heat-
ing mode), refrigerant circuit may have
defective.
5 Operate in test run mode and check pipe
<condenser- evaporator> temperature with
outdoor control p.c. board. If there is exclu-
sive difference with actual pipe <condenser-
evaporator> temperature replace indoor con-
trol p.c. board
There is no abnormality if none of above
comes within the unit.
Put the power off and on again to operate.
( In case of checking pipe temperature
with outdoor control p.c. board, be
sure to connect A-control service tool
(PAC-SK52ST).
Temperature display of indoor condenser/ Temperature display of indoor condenser/
evaporator pipe Indoor 1 evaporator pipe Indoor 2
1 2 3 4 5 6 1
ON
OFF
A-Control Service Tool SW2 setting
1 Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
2 Set one of the remote controllers "main".
If there is no problem with the action above.
3 Diagnose remote controllers.
a) When "RC OK" is displayed,
Remote controllers have no problem. Put
the power off, and on again to check. If
abnormality generates again, replace
indoor control p.c. board.
b) When "RC NG" is displayed,
Replace remote controller.
c) When "RC E3" is displayed,
d) When "ERC 00-06" is displayed,
Noise may be causing abnormality.
If the unit is not normal after replacing
indoor control p.c. board in group con-
trol, indoor control p.c. board of address
"0" may be abnormal.
12 Put the power off, and on again to check.
If abnormality generates again, replace
indoor control p.c. board.
Check LED display on outdoor control p.c.
board.
Refer to EA-EC item (on outdoor unit sec-
tion) if LED displays EA-EC.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor unit or
outdoor unit.
Check all the units in case of twin triple
indoor unit system.
2-4 Put the power off, and on again to check.
If abnormality generates again, replace
indoor control p.c. board or outdoor con-
trol p.c. board.
Other indoor control p.c. board may have
defective in case of twin triple indoor unit
system.
1-3 Put the power off, and on again to check.
If abnormality generates again, replace
indoor control p.c. board.
)
2 3 4 5 6
ON
OFF