Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 914 / 1106

FDC-HKX
912
1
Error display : No display
LCD display : No display
[Polarity determination trouble]
●
When the LCD display (Center/Remote, temperature display, etc.) of remote controller flashes, it means the polarity on the
unit is not yet determined. Polarity determination is completed within a few seconds after the power on. If it is not completed
in time, CPU out of cotnrol, etc. is suspected.
Notes (1) When CPU of one unit goes out of control, it
occuping the transmission section of the network,
so the transmission of other units are not done and
the polarity of the whole network will not be de-
termined.
(2) The unit which has its indoor and green LED light-
ing continuously (or no lighting) is the one with a
defective indoor unit PCB.
(3) If it becomes normal after replacing the PCB. it
can be considered that the PCB. is defective (de-
fective network transmission circuit).
Indoor unit
Red LED
Green LED
Stays OFF
Lights continuously
Red LED
Green LED
Stays OFF
Lights continuously
Outdoor unit
Indoor unit PCB green LED:
Keeps flashing?
Is it more than
10 sec.
after power on?
Is the remote
controller LCD
nomal
If yes, it is a
malfunction by
electrical noise
1 unit only
on network
Defective indoor unit PCB
Replacement Defective indoor unit PCB on
some units Replacement
Power supply reset
YES
YES
YES
NO
NO(Center or Remote only display)
(3)
(1)
(2) (3)
Multiple units
on network