Mitsubishi Electric PUHZ-ZRP35VKA2 Service Manual page 39

Check Code Abnormal points and detection method
Non defined check code
This code is displayed when non-defined
check code is received.
EF
(6607
or
6608)
Serial communication error
1 Abnormal if serial communication
between outdoor controller circuit board
and outdoor power circuit board is defec-
tive.
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 starts 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: 3: [ (Condenser/
Evaporator temperature (TH5) –
intake temperature (TH1))
Abnormal refrigerant circuit
During Cooling, Dry, or Auto Cooling
operation, the following conditions are
regarded as failures when detected for 1
second.
a) The compressor continues to run for 30
or more seconds.
PL
b) The liquid pipe temperature or the
condenser/evaporator temperature is
75°C or more.
These detected errors will not be
cancelled until the power source is
reset.
OCH635A
Cause
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 failure of
connector between outdoor controller
circuit board and M-NET board
2 Contact failure of M-NET board
power supply line
3 Noise has entered into M-NET trans-
mission 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.
1 Abnormal operation of 4-way valve
2 Disconnection of or leakage in
refrigerant pipes
3 Air into refrigerant piping
4 Abnormal operation (no rotation) of
indoor fan
• Defective fan motor.
• Defective indoor control board.
5 Defective refrigerant circuit (clogging)
39
Judgment and action
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 break-
ing of connection wire between outdoor
controller circuit board (CNMNT) and
M-NET board (CN5).
2 Check disconnection, looseness, or break-
ing of connection wire between outdoor
controller 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 / evapora-
tor> temperature display is indicated
by setting 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 3
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 3
ON
OFF
A-Control Service Tool SW2 setting
23 Check converse connection of exten-
sion pipe or converse wiring of indoor/
outdoor unit connecting wire.
1 When this error occurs, be sure to
replace the 4-way valve.
2 Check refrigerant pipes for disconnection
or leakage.
3 After the recovery of refrigerant, vacuum
dry the whole refrigerant circuit.
4 Refer to "10-6. HOW TO CHECK THE
PARTS".
5 Check refrigerant circuit for operation.
To avoid entry of moisture or air into
refrigerant circuit which could cause
abnormal high pressure, purge air in
refrigerant circuit or replace refrigerant.
)
4 5 6
ON
OFF
4 5 6
ON
OFF