Error Diagnosis Procedures At The Outdoor Unit Side - Mitsubishi Heavy Industries FDTCVA SERIES Technical Manual

(4) Error diagnosis procedures at the outdoor unit side

At the error diagnosis related to the outdoor unit, fi rst of all check the error code on the remote controller and the illumination
patterns of norma1 and inspection display lamps in the same manner as the case of indoor unit.
Then estimate the outline, the cause and the location of failure based on the pattern and proceed to the inspection and repair.
Since the self diagnosis function by means of the microcomputers of indoor/outdoor units provide the judgement of error of
microcomputers themselves irregularity power supply line, overload, etc. caused by the installation space, inadequate volume of
refrigerant etc., the location and cause of trouble will be discovered without diffi culty.
In addition, the display lamps error code of indoor/outdoor unit is kept fl ashing, (except when the power supply is iterrupted) after
the irregularity is automatically recovered to give irregularity information to the service personnel. If any mode of higher priority
than the error retained in memory occurs after the reset of error, it is switched to that mode and saved in the memory.
(a) Replacement parts assembly related to the outdoor unit controller
Outdoor unit PCB, power transistor module, capacitor, noise fi lter, thermistor, (heat exchanger, discharge pipe, ambient air tem-
perature, power transistor), fuse, transformer, etc.
(b) Replacement procedure of outdoor unit microcomputer printed circuit board.
Microcomputer printed circuit board can replaced with following procedure.
1) Confi rm the parts numbers.
Parts No.
PCA505A093Z
PCA505A102ZA
PCA505A189ZA
PCA505A189ZJ
PCA505A089ZH
2) Set the model using the model setting switch
• FDCVA151~251 model : SW6
• FDCVA302 model : SW4
• FDCVA402~1002 model : JSW1
Switch setting table (All switches are set in the OFF position when shipped from the factory.)
Model
Switch setting table
Set the switches ON or
OFF for each switch
No.
( ON, OFF)
3) Set the control select switch to match the previously set settings on the previous PCB.
If the previously set settings were set with jumper wires, the control select switch should be set in the ON position if there
was a jumper wire and in the OFF position if there wasn't a jumper wire.
4) Connect the faston terminals and connectors to the control PCB.
When connecting the wires to the faston terminals, connect each wire to the terminal printed with the same color on the
PCB.
Note (1) When connecting the faston terminals to the control PCB, connect them so that there is no deformation of the far end of the PCB.
(c) Outdoor unit inverter PCB
± Replacement procedure of outdoor unit inverter PCB
Inverter PCB can replaced with following procedure.
1) Confi rm the parts numbers.
Parts No.
PCA505A103ZY
PCA505A194A
PCA505A108
PCB505A044ZG
Applicable Model
FDCVA151HENR, 201HENR, 251HENR
FDCVA302HENR
FDCVA402HENAR, 502HENAR, 602HENAR
FDCVA402HESAR, 502HESAR, 602HESAR
FDCVA802HESAR, 1002HESAR
151HENR 201HENR 251HENR
Model
FDCVA302HENR
FDCVA402HENAR, 502HENAR, 602HENAR
FDCVA402HESAR, 502HESAR, 602HESAR
FDCVA802HESAR, 1002HESAR
402HENAR 502HENAR
302HENR
402HESAR 502HESAR
259
- -
602HENAR
802HESAR 1002HESAR
602HESAR