Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 906

FDC-HKX
19.6 MAINTENANCE DATA
(1) Before starting troubleshooting
(a) Confirmation of the error code on the remote controller (by pressing the inspection switch) and the inspec-
tion display and normal display lamps on PCBs (Printed circuit board) of indoor/outldoor units
The microcomputer detects errors on electrical components, which include the microcomputer itself, errors on the power supply
line and errors (overload, etc.) on the refrigerant circuit and the location of trouble is displayed (with the commbination of error
symbols of remote controller, normal (green) and inspection (red) display LED on PCBs of indoor/outdoor units). When any error
occurs, check first the inspection display. It will guide you to trouble point and assist you to complete the repair work quickly.
Error code of the remote controller is recorded on microcomputer after the trouble has been reset automatically so that, if you press
the inspection switch of remote controller, the error code and the number of unit in trouble are displayed for 10sec.. The inspection
display lamp on the indoor/outdoor unit PCB keeps flashing (glowing) even after the trouble was reset automatically. Inspection
lamp on the indoor unit PCB is turned off if the remote controller is reset.
1) Inspection/normal: List of power display
Section Display Section
Power supply display
Error code
Inspection display
Normal display
Error display
Normaly display
Error display
904
Display
At power ON : Displays always the return air temperature and Center/Remote.
LCD
At error : Displays E1 ~ E46 or blank depending on the kings of error.
LCD
At error : Flash continuously (indicates the occurence of error).
Red-LED
At power ON (normal) : Flash continuously.
Green-LED
At error : Off or continuous glowing or irregular illumination.
At error : Flash 1 ~ 3 times/5 sec for indoor unit depending on the kinds of error,
continuous flash, irregular illumination or off.
Red-LED
At error : Flash 1 ~ 9 times/10 sec for outdoor unit depending on the kinds of
error, continuous flash, irregular illumination or off.
At power ON (normal) : Flash continuously.
Green-LED1
At error : Off or continuous glowing or irregular illumination.
1 time flash
2 time flash
Red-LED2
Keeps flashing : Transmission error between inverter and outdoor unit
Contents of display
: Power transistor overheat
• Stop operation and wait till temperature drops.
: Current cut (Over-current on power transistor)
• Short circuit on compressor wiring
• Trouble on inverter PCB
• Trouble on power transistor
• Connector CN11 or CN12 is disconnected, or broken wire
between connectors.
• Error on outdoor unit control PCB
• Error on inverter PCB