Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 359

(4) Outdoor unit side (FDC(P)208~508 type, FDC808, 1008 type)
Check Indicator Table
Failure mode on the outdoor unit is indicated by flashing both Green LED (LED-G) and Red LED (LED-R) on the printed circuit board.
Outdoor unit LED
Green Red
Keeps flashing Stays OFF
Stays OFF 1 time flash
Stays OFF 2 time flashes
Stays OFF 3 time flashes
Stays OFF 4 time flashes
Stays OFF 5 time flashes
1 time flash 1 time flash
1 time flash 2 time flashes
1 time flash 3 time flashes
1 time flash 4 time flashes
1 time flash 5 time flashes
"Check Indicator" is resetted when power supply is turned off once and the failure is fixed.
(a) Procedure for diagnosing trouble for outdoor unit
When diagnosing trouble for the outdoor unit, check the flashing and turns of the inspection indicator lamp (red LED) and
fault indicator lamp (green LED) to obtain a general concept of the nature of the problem. Then inspect and perform repair.
1) Unit replacement parts related to printed circuit board for outdoor unit.
Micro-computer for outdoor unit, microcomputer, printed circuit board, thermistor (heat exchanger, discharge piping
and outdoor air), fuses and transformer.
2) Summary of replacement for micro-computer for outdoor unit
a) Check the following part number
Model
1 phase model
b) Set the overcurrent value using the overcurrent setting switch (SW3) for CM. Refer to the following table at the setting.
• Table of switch (SW3) setting
Model
Setting value (A)
Table of switch
setting
Make ON/OFF
setting for each
switch No.
( : ON,
Failure at:
Normal/Power is supplied.
• The outdoor power wiring is in reversed phase.
• Open phase at L3 phase (primary side).
Power wiring
• Incorrect set-up of outdoor unit PCB.
• Over current of the compressor motor.
Installation or
• Open phase at L2 phase (secondary wiring of 52C) of compressor.
operation status
• Defective outdoor unit PCB.
CM wiring • The wiring (secondary wiring of 52C) to the compressor is open.
Installation or
• The outdoor heat exchanger temperature is too high [70°C or over].
operation status
Outdoor heat
• Failure with the outdoor heat exchanger thermistor.
exchanger thermistor
Installation or
• The discharge gas temperature is too high.
operation status
Discharge gas
• Failure with the discharge gas thermistor.
thermistor
Outdoor heat • Failure or open circuit with the outdoor heat exchanger thermistor or
exchanger thermistor
Outdoor temperature • Failure or open circuit with the outdoor temperature thermistor or
thermistor
Discharge gas • Failure with the discharge gas thermistor or imperfect connection of the
thermistor connector.
Installation or
• The high pressure is too high or it went up (63H
operation status
Failure to open the
• Closing of the service valve on the liquid/gas side.
service valve
Parts No. Model
PCA505A046ZN 3 phase model
FDC208HEN3A FDC258HEN3A
FDCP208HEN3A FDCP258HEN3A
12 15
: OFF)
Contents of the failure
imperfect connection of the connector.
imperfect connection of the connector.
Parts No.
PCA505A046ZS FDC808, 1008 model
FDC308HEN3 FDC308HES3 FDC408HES3
FDCP308HEN3 FDCP308HES3 FDCP408HES3
23 9 12
FDT ( N ) -H
, 49C).
1
Model Parts No.
PCA505A046ZC
FDC508HES3
FDC808HES3 FDC1008HES3
FDCP508HES3
15 24 34
357