Mitsubishi Heavy Industries FDC1000KXZWE1, Service Manual, Page: 107 / 183

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105
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'14 • KX-SM-200
Error code
Remote control:
7-segment display:
LED Green Red
Indoor unit
Heat source unit
Content
E49
E49
Low pressure anomaly
Keeps flashing Stays OFF
Keeps flashing 1-time flash
1. Applicable model
5. Troubleshooting
Heat source unit
Diagnosis Countermeasure
Does the low
pressure fluctuate after the
startup?
Is the
connection of
sensor connector
OK?
Does the
error occur immediately after
the startup?
Are the
sensor characteristics
OK?*
* The sensor
characteristics is shown in
page 107.
Save data for 30 minutes before stopping in Mente PC.
Reset power source and restart.
YES
YES
YES
YES
NO
YES
NO
NO
Is the opening
degree of EEV for
evaporator side
fluctuating?
Is the
connection of
thermistor connector for
heat exchanger
OK?
Is the checked
result of harness and insulation
of EEV coil OK?
Are the thermistor
characteristics OK?
Does the
EEV operate
normally by judging
from Mente PC
data, etc?
Isn’t EEV
or strainer
clogged?
NO
YES YES
NO
YES
YES
NO
NO
YES NO
NO
NO
Check and save the data of
operating conditions
Check error status.
Is the refrigerant amount
OK?
Check additional refrigerant
amount charged at site
according to the piping
length instructed on the
label pasted on the panel of
the unit.
Check whether the service
valves are open.
Correct the connection
of low pressure sensor
connector.
Replace low pressure
sensor.
Replace heat source unit
control PCB.
Correct the connection of
temperature thermistor
connector of heat
exchanger.
Replace temperature
thermistor of heat
exchanger at evaporator
side.
Replace control PCB at
evaporator side.
Replace EEV coil.
Replace EEV main body or
strainer.
Check heat exchanger at
evaporator side.
2. Error detection method
Detection of anomalously low
pressure.
3. Condition of error displayed
• At start up after power on:
When the low pressure sensor
detects lower than 0.003MPa
for 60 seconds continuously.
And if this anomaly occurs 2
times.
• During operation:
When the low pressure sensor
detects 0.134MPa or lower
for 30 seconds continuously.
And if this anomaly occurs 5
times within 60 minutes.
4. Presumable cause
• Low pressure sensor (PSL)
anomaly
• Service valves closed
• EEV anomaly (EEV closed)
• Insufficient refrigerant
amount
• Clogging at EEV or strainer
Note:
Check whether the indoor unit is connected to other heat source unit Superlink network.
If the error does not recur, connect the Mente PC and continue to collect data.