Mitsubishi Electric PUHZ-RP3VHA Technical & Service Manual page 33

Error Code Meaning of error code and detection method
Indoor/outdoor unit communication
error (Transmitting error)
(Outdoor unit)
(1) Abnormal if "0" receiving is detected 30
E9
times continuously though outdoor con-
(6841)
troller board has transmitted "1".
(2) Abnormal if outdoor controller board
could not find blank of transmission
path for three minutes.
Non defined error code
This code is displayed when non defined
error code is received.
EF
(6607
or
6608)
Serial communication error
1.Abnormal if serial communication
between outdoor controller board and
outdoor power board is defective.
Ed
(0403)
2. Abnormal if communication between
outdoor controller board and M-NET p.c.
board is not available.
Error Code Meaning of error code and detection method
Abnormality of pipe temperature
<Cooling mode>
Detected as abnormal when the pipe tem-
perature is not in the cooling range 3 min-
utes later of compressor start and 6 min-
utes later of the liquid or condenser/evapo-
rator pipe is out of cooling range.
Note 1) It takes at least 9 min. to detect.
Note 2) Abnormality P8 is not detected in
drying mode.
Cooling range : Indoor pipe temperature
(TH2 or TH5) – intake temperature
[ -3 deg
(TH1)
TH: Lower temperature between: liquid
pipe temperature and condenser/
evaporator temperature
P8
<Heating mode>
When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when
condenser/evaporator pipe temperature is
not in heating range within 20 minutes.
Note 3) It takes at least 27 minutes to
detect abnormality.
Note 4) It excludes the period of defrosting
(Detection restarts when defrosting
mode is over)
Heating range : 3 deg [ (Condenser/
Evaporator temperature(TH5) –
intake temperature(TH1))
Case
1 Indoor/ outdoor unit connecting
wire has contact failure.
2 Defective communication circuit
of outdoor controller board
3 Noise has entered power supply.
4 Noise has entered indoor/ out-
door unit connecting wire.
1 Noise has entered transmis-
sion wire of remote controller.
2 Noise has entered indoor/ out-
door unit connecting wire.
3 Outdoor unit is not a series of
power-inverter.
4 Model name of remote con-
troller is PAR-S25A.
1 Breaking of wire or contact fail-
ure of connector CN2
2 Breaking of wire or contact fail-
ure of connector CN4
3 Defective communication cir-
cuit of outdoor power board
4 Defective communication cir-
cuit of outdoor controller board
for power board
1 Breaking of wire or contact fail-
ure of connector between out-
door controller board and M-
NET p.c. board
2 Contact failure of M-NET p.c.
board power supply line
3 Noise has entered into M-NET
transmission wire.
Case
1 Slight temperature difference
between indoor room tempera-
ture and pipe <liquid or con-
denser-evaporator> tempera-
ture thermistor
• Shortage of refrigerant
• Disconnected holder of pipe
<liquid or condenser-evapo-
rator> thermistor
• Defective refrigerant circuit
2 Converse connection of exten-
sion pipe (on plural units con-
nection)
3 Converse wiring of indoor/out-
door unit connecting wire (on
plural units connection)
4 Defective detection of indoor
room temperature and pipe
<condenser-evaporator> tem-
perature thermistor
5 Stop valve is not opened com-
pletely.
33
Judgment and action
1 Check disconnection or looseness of
indoor/outdoor unit connecting wire.
2~4 Put the power off, and on again to check.
Replace outdoor controller board if
abnormality is displayed again.
12 Put the power off, and on again to check.
Replace indoor controller board or outdoor
controller board if abnormality is displayed
again.
3 Replace outdoor unit with power-inverter ty-
pe outdoor unit.
4 Replace remote controller with MA remote
controller.
12 Check connection of each connector CN2,
CN4.
3 Replace outdoor power board.
4 Replace outdoor controller board.
1 Check disconnection, looseness, or breaking
of connection wire between outdoor con-
troller board(CNMNT) and M-NET p.c.
board(CN5).
2 Check disconnection, looseness, or breaking
of connection wire between outdoor con-
troller board(CNMNT) and M-NET p.c.
board(CND).
Judgment and action
1~4
Check pipe <liquid or condenser-
evaporator> temperature with room
temperature display on remote
controller and outdoor controller
board.
Pipe <liquid or condenser-evaporator>
temperature display is indicated by
setting SW2 of outdoor controller board
as follows.
(
Conduct temperature check with outdoor
controller board after connecting 'A-Control
Service Tool(PAC-SK52ST)'.
Temperature display of indoor condenser/
Temperature display of indoor liquid pipe
evaporator pipe Indoor 1
Indoor 1
1 2 3 4 5 6 1
ON
OFF
Temperature display of indoor condenser/
Temperature display of indoor liquid pipe
evaporator pipe Indoor 2
Indoor 2
1 2 3 4 5 6 1
ON
OFF
A-Control Service Tool SW2 setting
23Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.
)
2 3 4 5 6
ON
OFF
2 3 4 5 6
ON
OFF