Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 90

Error code
E43
Remote controller:
E43-1, 2 *1
7-segment display:
*1 E43-1/1 time flash: Excessive number of indoor units connected, E43-2/2 time flash:Excessive capacity of connection
1. Applicable model
Outdoor unit
2. Error detection method
When the number of connected
indoor units exceeds the
limitation.
When the total capacity of
connected indoor units exceeds
the limitation.
3. Condition of error displayed
• Excessive number of
connected indoor units
• Excessive total capacity of
connected indoor units
• The total capacity of
connected indoor units
exceeds the limitation
4. Presumable cause
• Mistake in setting of indoor/
outdoor unit addresses
• Mistake in signal wire
connection
Note:
After completing the above procedure, reset the power and confirm that the error display does not recur. Unless the power
is reset for both indoor unit and outdoor unit, the set addresses will not be confirmed.
LED Green Red
Keeps flashing Stays Off
Indoor
Keeps flashing *1
Outdoor
5. Troubleshooting
Diagnosis
Save data for 30 minutes before stopping in Mente PC
Reset the power.
Is E43 dispalyed?
YES
Does
the number of
indoor units connected
and/or total capacity
exceed limitation?
Check the connected number
of indoor units with 7-segment
display code C50 or Mente PC
with reference to the utilities
drawing. (Check not only one
system, but also other systems)
Are there
any indoor units which
is not expected to exsist in
that signal
Check the resistance
between A and B of signal
line as well.
General checking of indoor/outdoor unit addresses by means of:
� Outdoor unit: Mente PC, 7-Segemnt display and rorary
switch (SW1, 2)
� Indoor unit: Remote controller, rotary switch
(SW1, 2, 3, 4)
* It is recommended to use means other than the rotary switch
which could be defective.
88
–
Content
Excessive number of indoor units connected,
excessive total capacity of connection
Caution:
Address will not be confirmed,
unless the power is reset after
changing addess.
NO
YES
NO
YES
line?
NO
–
Countermeasure
Check and save the data of
operating condition.
Test run.
No action is taken because
it is judged that the power
reset was not done after
changing address.
Check indoor unit
addresses and correct.
In case that total capacity
of connected indoor units
exceeds the limitation,
if tentative operation is
required turn ON the dip
switch SW5-4 on the
outdoor control PCB.
(However since this
tentative solution could
cause trouble, be sure
to correct it as soon as
possible)
Signal wire may be
connected to other outdoor
unit system.
Correct the signal wire.
Correct addresses.
(Either one of addresses is
wrong.)
If the address corrected
with rotary switch is still
wrong, replace control PCB
(Defective rotary switch)
* Before replacement,
please confirm whether
the rotary switch for
address setting is not
damaged. (It was
experienced that No. 5
on rotary switch was not
recognized.)