Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 69

Error code
E5
Remote controller:
-
7-segment display:
1. Applicable model
All models
2. Error detection method
When the communication
between indoor and outdoor
units is interupted for more than
2 minutes
3. Condition of error displayed
When this anomaly is detected
during operation.
4. Presumable cause
• Unit address No. setting error
• Remote controller wires broken
• Poor connection/disconnection
of remote controller wires
• Indoor control PCB anomaly
Note:
When the pump down switch is turned on, communication between indoor and outdoor units is cancelled so that
"Communication error E5" will be displayed on the remote controller and indoor control PCB, but this is normal.
LED Green Red
Keeps flashing *See below
Indoor
Keeps flashing 2 time flash
Outdoor
5. Troubleshooting
Diagnosis
* In case that indoor red LED flashes 2 times
Note (1) Check the connection (disconnection, looseness)
Is the
connection of signal wires
at the outdoor unit side
OK?
YES
Note (2) Check the connection (disconnection, looseness,
Is the
connection of signal wires
between indoor and outdoor
units OK?
YES
Reset the power supply and restart.
Does the
remote controller LCD
becomes normal?
* In case that indoor red LED stays OFF
Reset the power supply and restart.
Does the
remote controller
LCD becomes
normal?
67
–
Content
Communication error during operation
of signal wires at outdoor terminal block
NO
brakage) of signal wires between indoor and
outdoor units
NO
NO
YES
NO
YES
–
Countermeasure
Repair signal wires.
Repair signal wires.
Go to the diagnosis of
(1)
WAIT
Unit is normal.
(Malfunction by temporary
noise, etc.)
Outdoor control PCB anomaly
(Network communicaion
circuit anomaly)
→ Replace it
Unit is normal.
(Malfunction by temporary
noise, etc.)