Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 1085

12
Error display:
Indoor unit
Red LED Stays OFF
Green LED Keeps flashing
Doesn't the number
of indoor unit connected exceed
the specified
value?
Power supply reset
Is it
normalized
Unit is normal
(malfunction by
accidental noise)
13
Error display:
Indoor unit
Red LED Stays OFF
Green LED Keeps flashing
• Defective inverter PCB
• Defective outdoor unit PCB
The inverter PCB cannot receive signals
Notes (1) Make a check referring to Troubleshooting for Inverter (page 1090).
(2) When receiving fails, the LD4 comes on at once. If the outdoor unit cannot receive signals for 10 seconds, the 52C is turned OFF.
Accordingly, the ON state can be checked only in this period of 10 seconds.
[Excessive number of indoor units connected]
Outdoor unit
Red LED
Green LED
(1)
YES
NO
YES
Defective indoor outdoor
unit PCB → Replacement
NO
[Transmission error between inverter and Outdoor unit PCB]
Check that the 52C is ON. With the 52C ON, power is supplied to the inverter PCB.
Outdoor unit
Red LED
Green LED
Does the
LD1 (Green) on the
inverter PCB
flash?
NO
Does the LD4
YES
(red) on the inverter PCB
light? (2)
NO
• Defective inverter PCB
• Defective outdoor unit PCB
• Broken Cnl in No.5 (See next page)
- The outdoor unit PCB cannot receive signals.
- The inverter PCB cannot send signals.
- The watch dog signal cannot be taken.
7 time flash
Keeps flashing
Repair
Notes (1) The maximum number of connect-
9 time flash
Keeps flashing
Is the
NO
power supply
line normal?
Repair
FDC-HKXR
able unit of each model is as
follows: 9.
(2) Outdoor No. setting check for in-
door units (to see if outdoor No. is
of other system)
(3) In case of auto addressing erase the
addresses stored in memory and
perform re-setting.
YES
Defective inverter PCB
NO
1083