Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 1083 / 1106

1081
FDC-HKXR
YES
YES YES
NO
Does
the
FM
O
rotate?
YES
NO
Is the current
(U,V,W) of the
compressor at the
normal level?
NO
YES
Power supply
reset
Repair
YES
NO
Is the
outdoor unit
installation
space
proper?
YES
NO
Does the
IM (Inverter
cooling fan)
rotate?
Power transistor
overheating
(1)
Defective
inverter
(Refer to 1090 page)
Defective
inverter
Unit is normal
(Malfunction by
accidental noise)
(Refer to 1090 page)
• Is not it operated under
overload
• Is the power supply voltage
correct (not too hight)?
• Are the power supply wires
oppropriate(not too thin)?
• Isn't the compressor locked?
• Is the insulation or winding resistance of the
compressor motor proper?
• Is the electronic expansion valve closed?
• Is the installation space of indoor/outdoor unit
adequate?
• Is there any short circuit on the indoor/outdoor
unit
• During cooling: Is FM
O
operating?
• At heating:
• Is FM
1
operating?
• Is the service valve (gas side) opened fully?
• Is the filter clogged?
10
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
Red LED
Green LED
4 time flash
Keeps flashing
Indoor unit
Error display:
[Power transistor overheating]
11
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
Red LED
Green LED
1 time flash
Keeps flashing
Indoor unit
Error display:
[Current cut]
Note (1) The LD2 on the inverter control PCB lights for 3 minutes. Fin thermostat set value: 90
°
C open/83
°
C close
Notes (1) The LD3 lights for 3 minutes.
(2) For details of the check procedure, see the next page.
Remarks: When current-cut occurs immediately after a start (the Hz value does not increase), check the LD3 on the inverter PCB if an error
code is not indicated on the remote controller and the compressor does not operate. When this LD3 is ON, see the next page.