Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 915

Error display : No display
2
LCD display : No display
Outdoor unit
Stays OFF
Red LED
Stays OFF
Green LED
Indoor unit
Red Stays
OFF
LED
Green Stays
LED OFF
Indoor unit
*3 time flash
Red LED
(During unit operation)
Keeps flashing
Green LED
Flash of green LED means CPU is normal.
* If the remote controller wire is broken at the
power ON, it does not illuminate.
Error display :
3
Indoor and outdoor unit
Red LED Stays OFF
Keeps flashing
Green LED
Note (1) With the separate power supplies for
indoor/outdoor units, the outdoor unit
green LED may flash in some cases.
[Power supply line error]
YES
Power supply checked
between 1~2 or
L , L , L , N?
1 2 3
NO
No power supply, wiring
• Blown fuse (indoor unit:3.15A, outdoor unit:3.15A)
error of power line
Repair
• Defective transfomer
• Broken power cables of inside or outside of
unit
Is there
DC 10V checked
between X (red) ~ Z (black)
of indoor unit terminal
Defective remote controller PCB
Replacement
e1
[Communication error between remote controller~Indoor unit]
(1)
Is the
remote controller
covering multiple
units?
NO
Power supply reset
Is it
normalized
NO
Defectve indoor unit
PCB Replacement
Indoor/outdoor unit
YES
transfomer CNW (indoor).
2
CNA (outdoor). Is AC 17V
2
checked between (blue)
(blue) and AC 8V between
(red) ~ (red)?
NO
Replacement
Replacement
Repair
YES
Poor connection of wired remote controller
cord (wiring error) or broken wire
block?
NO Note (1) Z for ground
YES
Is the power ON
on all indoor units?
NO
Power supply ON
Unit is normal.
YES
(Malfunction by accidental
noise)
FDC-HKX
Unit is normal
(Malfunction by noisse)
YES
Is it
Power supply
normalized
reset
NO
Defective remote control-
ler PCB Replacement
Repair
YES
Defectve indoor unit
PCB Replacement
913