–
108
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'20 • KX-T-373
E48
E48
Outdoor DC fan motor anomaly
Stays Off
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
Does
any foreign material
intervene in rotational area of
fan propeller?
Does
the fan rotate
smoothly when turned
by hand?
Save data for 30 minutes before stopping in Mente PC.
NO
NO
YES
YES
Is the voltage
between CNA2 1 and 3
pins DC280V?
Are the fan motor
fuse near CNA2 or fan converter
fuse (inverter PCB F1*)
blowned?
Reset the power source.
Does
it become normal?
Check and save the data of
operating conditions.
Remove foreign material.
Replace fan motor.
If the resistance between
①
(Vm : Red) and
④
(GND
Blue) is 1Ω or lower, it is
defective.
Disconnect the fan motor
and check the DC power
source voltage.
Replace defective fan
motor and outdoor unit
control PCB.
Replace fan motor.
After replacement of fan
motor, if this error still
occurs, replace outdoor unit
control PCB as well.
Temporary noise may cause
2. Error detection method
By detecting the rotation speed
of outdoor fan motor.
3
.
Condition of error displayed
If the actual rotation speed
of outdoor fan motor (FMo1)
is 100min
-1
or lower for 30
seconds continuously, outdoor
fan stops. After 3-minute delay,
it restarts automatically, but if
this anomaly occurs 5 times
within 60 minutes after the initial
stop.
4. Presumable cause
•
Faulty outdoor unit control PCB
• Foreign material in rotational
area of fan propeller
• Faulty fan motor
•
Dust on the outdoor unit control
PCB
• Blown fuse
Note: When E48 error occurs, in almost cases F3 fuse (4A) on the harness is blown. There are a lot of cases that fuse is blown
due to defective fan motor. And even though only the fuse is replaced, control PCB also could be broken. Therefore when
replacing fuse, check whether the fan motor is OK or not.
After confirming the fan motor normal, check by power ON. (Don’t power ON without confirming the fan motor normal.)
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
NO
NO
YES
YES
NO
YES
*Three phase model only
Is fan motor 15V
OK? (between “TP_FMO_+”
and “TP_FMO_-”
on the control PCB)
Are
resistances of fan motor
OK?
YES
Are
operating speed and
actual speed same?
Replace outdoor unit
control PCB.
Replace fan motor.
YES
YES
Are
operating speed and
actual speed same?
YESYES
Operation is
1: OK → Replace fan motor
2: NG → Replace outdoor
unit control PCB
NO
NO
NO
E49
E49
Low pressure error
Stays Off
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
Does the low
pressure fluctuate after the
startup?
Is the
sensor connector
OK?
Does it
occur immediately after the
startup?
Are the
sensor characteristics
OK?*
* Refer to page 265 for the
sensor characteristics.
Save data for 30 minutes before stopping in Mente PC.
Reset the power and restart operation.
Is the opening
degree of indoor EEV
flucturing?
Is the sensor
connector of indoor heat
exchanger OK?
Is the checked
result of harness and insulation
of EEV coil OK?
Are the sensor
characteristics OK?
Does the
EEV operate
normally by judgement
from Mente PC
data, etc?
Isn’t EEV
or strainer
clogged?
Check and save the data of
operating condition.
Check error status.
Is the refrigerant amount
OK?
Check additional
in locally according to the
piping length instracted
on the label pasted on the
pannel.
Check whether the service
valve opened.
Correct low pressure sensor
connector.
Replace low pressure
sensor.
Replace outdoor unit control
PCB.
Correct temperature
sensor connector.
Replace heat exchanger
temperature sensor.
Replace indoor unit control
PCB.
Replace EEV coil.
Replace EEV main body or
strainer.
Check for short-circuit of
and failure of indoor fan
motor.
2. Error detection method
Detected by low pressure sensor
3
.
Condition of error displayed
At startup with power on:
Low pressure ≤0.18 MPa is
detected for 30 seconds, and this
anomaly occurs 5 times within
60 minutes.
During operation:
Low pressure ≤0.134 MPa
is detected for 30 seconds or
<0.003 Mpa is detected for 5
seconds. This anomaly occurs 5
times within 60 minutes.
4. Presumable cause
• Low pressure sensor
(defective PSL)
• Service valve closed
• EEV closed (malfunction)
• Insufficient refrigerant
amount
• Clogging (EEV, strainer)
Note: Check whether the outdoor unit is connected to the indoor units in another Superlink network?
If it does not recur, connect the Mente PC and continue to collect data.
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
NONO
NO
NO
NO
NO
NO
NO
NONO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YESYES
YESYES
YESYES
YESYES
YESYES
YESYES
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263
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