Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 1070

FDC-HKXR
20.6. MAINTENANCE DATA
20.6.1 Diagnosis of Microcomputer circuit
(1) Confirmation of the error code on the remote controller (by pressing the inspection switch) and the inspection
display and normal display lamps on PCBs of indoor/ outdoor units
The microcomputer detects errors on electrical components, whitch 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 combination 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 the trouble point and assist you to complete the repair work quikly.
Error code of the remote controller is recorded on the 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 10 sec., 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
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Display
LCD 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.
Red-LED At error: Flash continuously (indicates the occurrence of error).
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-LD1
At error: off or continuous glowing or irregular illumination.
Red-LD2 At error: Lights when the power transistor overheats (for 3 minutes or more).
Red-LD3 At error: Lights upon occurrence of a current-cut (held for 3 minutes).
Red-LD4 At error: Lights when a transmisson error occurs between outdoor unit inverters.
Contents of display