Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 87

Error code
E40
Remote controller:
E40
7-segment display:
1. Applicable model
Outdoor unit
2. Error detection method
When high pressure switch
63H1-1 or 63H1-2 is activated
3. Condition of error displayed
• If high pressure exceeds
4.15MPa
• If 63H1-1, 2 is activated 5
times within 60 minutes
• If 63H1-1 is activated for 60
minutes continuously
4. Presumable cause
• Short-circuit of airflow
at condenser side of heat
exchanger/Disturbance of
airflow/Clogging filter/Fan
motor anomaly
• Disconnection of high
pressure switch connector
• Breakage of high pressure
switch harness
• Closed service valves
• High pressure sensor anomaly
• High pressure switch anomaly
Note:
If the error does not recur, connect the Mente PC and continue to collect data.
LED Green Red
Keeps flashing Stays Off
Indoor
Keeps flashing 1 time flash
Outdoor
5. Troubleshooting
Diagnosis
Save data for 30 minutes before stopping in Mente PC
Was 63H1
or 63H1-2 activated at 4.15MPa
or higher?
YES
YES
Are the
service valves fully
open?
YES
Connect a pressure gauge and
restart operation.
Is it
stop at 4.15MPa of gauge
pressre ?
YES
Is there any
clogging in the refrigerant
circuit ?
NO
85
–
High pressure anomaly
Content
(63H1-1, 2 activated)
NO
Does the sensed
value of the high pressure
sensor show 4.15MPa?
(Normal?)
YES
Are the
63H1-1, 2 OK?
Are the connector and/or
harnesse
OK?
NO
NO
YES
–
Countermeasure
Check and save the data of
operating condition
Check the sensed value of
high pressure sensor when the
63H1-1, 2 is activated
Check whether the high
pressure switch is activated
at the sensed value of high
pressure sensor.
High pressure sensor
anomaly is suspicious.
NO
Check high pressure sensor
itself according to the
troubleshooting procedure of
E54, after retarting operation.
(If the high pressure sensor
[PSH] fails, replace it)
If the connector is
disconnected or the harness
NO
is broken, correct it.
Also check whether the
high pressure switch is
properly mounted or not
Open operation valve.
Check it, as much as
possible, under the
operating conditions for
30 minutes before error
occurred.
Replace outdoor control
PCB.
Remove clogs.
Check items (condenser
side):
• Filter clogging
• Airflow volume (Fan
motor)
• Short-circuit of airflow