Mitsubishi Electric PUHZ-ZRP100VKA3 Service Manual page 43

Check Code Abnormal points 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 circuit board has transmitted "1".
2 Abnormal if outdoor controller circuit board
could not find blank of transmission path for
3 minutes.
Non defined check code
This code is displayed when non defined
EF
check code is received.
(6607
or
6608)
Serial communication error
1 Abnormal if serial communication between
outdoor controller circuit board and out-
door power circuit board is defective.
Ed
(0403)
2 Abnormal if communication between
outdoor controller circuit board and
M-NET board is not available.
Pipe temperature
<Cooling mode>
Detected as abnormal when the pipe
temperature is not in the cooling range
3 minutes after compressor start and
6 minutes after the liquid or condenser/
evaporator pipe is out of cooling range.
Note 1: It takes at least 9 minutes to detect.
Note 2: Abnormality P8 is not detected in
drying mode.
Cooling range:
Indoor pipe temperature (TH2 or
TH5)−intake temperature (TH1) [ −3:
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:
OCH645
Case
1 Indoor/outdoor unit connecting
wire has contact failure.
2 Defective communication circuit of
outdoor controller circuit board
3 Noise has entered power supply.
4 Noise has entered Indoor/outdoor
unit connecting wire.
1 Noise has entered transmission
wire of remote controller.
2 Noise has entered Indoor/outdoor
unit connecting wire.
3 Outdoor unit is not a series of
power-inverter.
1 Breaking of wire or contact failure
of connector CN2 between the
outdoor controller circuit board
and the outdoor power circuit
board
2 Breaking of wire or contact failure
of connector CN4 between the
outdoor controller circuit board
and the outdoor power circuit
board
3 Defective communication circuit
of outdoor power circuit board
4 Defective communication circuit of
outdoor controller circuit board for
outdoor power circuit board
1 Breaking of wire or contact fail-
ure of connector between out-
door controller circuit board and
M-NET board
2 Contact failure of M-NET board
power supply line
3 Noise has entered into M-NET
transmission wire.
1 Slight temperature difference
between indoor room temperature
and pipe <liquid or condenser/
evaporator> temperature
thermistor
• Shortage of refrigerant
• Disconnected holder of
pipe <liquid or condenser/
evaporator> thermistor
• Defective refrigerant circuit
2 Converse connection of extension
pipe (on plural units connection)
3 Converse wiring of indoor/outdoor
unit connecting wire (on plural
units connection)
4 Defective detection of indoor
room temperature and pipe
<condenser/evaporator>
temperature thermistor
5 Stop valve is not opened
completely.
43
Judgment and action
1 Check disconnection or looseness of
indoor/outdoor unit connecting wire.
2–4 Turn the power off, and on again to
check. Replace outdoor controller cir-
cuit board if abnormality is displayed
again.
12 Turn the power off, and on again to
check.
Replace indoor controller board or
outdoor controller circuit board if
abnormality is displayed again.
3 Replace outdoor unit with power-inverter
type outdoor unit.
12 Check connection of each connector
CN2 and CN4 between the outdoor
controller circuit board and the outdoor
power circuit board.
3 Replace outdoor power circuit board.
4 Replace outdoor controller circuit board.
1 Check disconnection, looseness, or breaking
of connection wire between outdoor control-
ler circuit board (CNMNT) and M-NET board
(CN5).
2 Check disconnection, looseness, or breaking
of connection wire between outdoor control-
ler circuit board (CNMNT) and M-NET board
(CND).
3 Check M-NET transmission wiring method.
1–4 Check pipe <liquid or condenser/
evaporator> temperature with room
temperature display on remote controller
and outdoor controller circuit board.
Pipe <liquid or condenser / evaporator>
temperature display is indicated by set-
ting SW2 of outdoor controller circuit
board as follows.
(
Conduct temperature check with outdoor
controller circuit 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 2
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 2
ON
OFF
A-Control Service Tool SW2 setting
23 Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.
)
3 4 5 6
ON
OFF
3 4 5 6
ON
OFF