Mitsubishi Electric PUHZ-P200YHA Service Manual page 34

Abnormal point and detection method
Error Code
Pipe temperature
<Cooling mode>
Detected as abnormal when the pipe tem-
perature is not in the cooling range 3 min-
utes 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) – room temperature
(TH1) [ -3:
TH: Lower temperature between liquid pipe
temperature and condenser/evaporator
P8
temperature
(1110)
<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 heat-
ing 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) –
room temperature(TH1))
<M-NET communication error>
Error Code Abnormal point and detection method
Address duplicate definition
This error is displayed when transmission
from the units of same address is detected.
A0
Note) The address and attribute displayed
(6600)
at remote controller indicate the con-
troller that detected abnormality.
Hardware error of transmission
processor
Transmission processor intended
to transmit "0", but "1" appeared on
transmission wire.
A2
Note) The address and attribute displayed
(6602)
at remote controller indicate the
controller that detected abnormality.
BUS BUSY
1. Overtime error by signal collision damage
Abnormal if transmitting signal is not
possible for 8-10 minutes continuously
because of collision of transmission.
2. Data could not reach transmission wire
for 8-10 minutes continuously because
of noise or etc.
Note) The address and attribute displayed
A3
at remote controller indicate the
(6603)
controller that detected abnormality.
OCH424E
Case
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.
(Note) "Indoor unit" in the text indicates M-NET board in outdoor unit.
Case
1 There are 2 or more same
address of controller of out-
door unit, indoor unit, FRESH
MASTER, or LOSSNAY.
2 Noise has entered into trans-
mission signal and signal was
transformed.
1
Error is detected if waveform is
transformed when wiring works of
transmission wire of outdoor unit,
indoor unit, FRESH MASTER or
LOSSNAY are done, or polarity is
changed with the power on and
transmission data collide each other.
2
Defective transmitting receiving
circuit of transmission processor
3
Transmission data is changed by
the noise on transmission.
1
Transmission processor could
not transmit signal because
short cycle voltage of noise
and the like have entered into
transmission wire continuously.
2
Transmission quantity has
increased and transmission of
signal is not possible because
there was wiring mistake of
terminal block for transmission wire
(TB3) and terminal block for central
control (TB7) in outdoor unit.
3
Transmission are mixed with
others and occupation rate on
transmission wire rose because
of defective repeater (a function
to connector or disconnect
transmission of control and
central control system) of outdoor
unit, then abnormality is detected.
34
Judgment and action
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
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
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.
Judgment and action
Search the unit with same address as abnormality
occurred. If the same address is found, turn the
power supply of outdoor unit and indoor unit
and FRESH MASTER or LOSSNAY at the same
time for 2 minutes or more after the address is
corrected, and turn the power on again.
Check transmission waveform or noise on
transmission wire.
1 If the works of transmission wire is done
with the power on, turn off the power supply
of outdoor unit and indoor unit and FRESH
MASTER or LOSSNAY at the same time for
2 minutes or more, and turn the power on
again.
2 Check transmission waveform or noise on
transmission wire.
1 Check if transmission wire of indoor unit,
FRESH MASTER, LOSSNAY, or remote
controller is not connected to terminal block
for central control (TB7) of outdoor unit.
2 Check if transmission wire of indoor unit,
FRESH MASTER or LOSSNAY is not
connected to terminal block for transmission
wire of outdoor unit.
3 Check if terminal block for transmission wire
(TB3) and terminal block for central control
(TB7) is not connected.
4 Check transmission waveform or noise on
transmission wire.
)
2 3 4 5 6
ON
OFF
2 3 4 5 6
ON
OFF