'18 • PAC-SM-298
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32
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2. MAINTENANCE DATA
2.1 Diagnosing of microcomputer circuit
(1) Selfdiagnosis function
(a) Check Indicator Table
Whether a failure exists or not on the indoor unit and outdoor unit can be know by the contents of remote control error code,
indoor/outdoor unit green LED (power pilot lamp and microcomputer normality pilot lamp) or red LED (check pilot lamp).
(i) Indoor unit
Remote control
Indoor control PCB
Outdoor control PCB
Location of trou-
ble
Description of trouble
Repair method
Reference
page
Error code Red LED Red LED
Green
LED (1)
Red LED
Green
LED (1)
No-indication Stays OFF
Stays OFF
Keeps
flashing Stays OFF
Keeps
flashing
—
• Normal operation
—
—
Stays OFF Stays OFF
2-time
flash
Stays OFF Indoor unit power
source
• Power OFF, broken wire/blown fuse, broken transformer wire
Repair
54
*
3-time
flash
Keeps
flashing Stays OFF
Keeps
flashing
Remote control
wires
• Poor connection, breakage of remote control wire * For wire breaking at power ON, the
LED is OFF.
Repair
55
Remote control • Defective remote control PCB
Replacement of
remote control
WAIT
or
INSPECT I/U
Stays OFF
Keeps
flashing
2-time
flash
Keeps
flashing
Indoor-outdoor
units connection
wire
• Poor connection, breakage of indoor-outdoor units connection wire
Repair
56
-
60
Remote control • Improper setting of master and slave by remote control
Keeps
flashing
Stays OFF
*
Keeps
flashing Stays OFF
Keeps
flashing
Remote control
wires (Noise)
•
Poor connection of remote control signal wire (White)
•
Intrusion of noise in remote control wire
* For wire breaking at power ON, the LED is OFF
Repair
62
Remote control
indoor control PCB
*
• Defective remote control or indoor control PCB (defective communication circuit)?
Replacement of
remote control or
PCB
2-time
flash
Keeps
flashing
2-time
flash
Keeps
flashing
Indoor-outdoor
units connection
wire
•
Poor connection of wire between indoor-outdoor units during operation
(disconnection, loose connection)
•
Anomalous communication between indoor-outdoor units by noise, etc.
Repair
63
2-time
flash
Keeps
flashing Stays OFF
Keeps
flashing
(Noise)
•
CPU-runaway on outdoor control PCB
Power reset or
Repair
Outdoor control
PCB
*
• Occurrence of defective outdoor control PCB on the way of power source (defective com-
munication circuit)?
Replacement of
PCB
2-time
flash
Keeps
flashing Stays OFF Stays OFF
Outdoor control
PCB
•
Defective outdoor control PCB on the way of power source
Replacement
Fuse
•
Blown fuse
1-time
flash
Keeps
flashing Stays OFF
Keeps
flashing
Indoor heat
exchanger tempera-
ture sensor
•
Defective indoor heat exchanger temperature sensor
(defective element, broken
wire, short-circuit)
• Poor contact of temperature sensor connector
Replacement, repair
of temperature
sensor
64
Indoor control PCB
*
•
Defective indoor control PCB (Defective temperature sensor input
circuit)?
Replacement of
PCB
1-time
flash
Keeps
flashing Stays OFF
Keeps
flashing
Indoor return air
temperature sensor
•
Defective indoor return air temperature sensor
(defective element, broken wire,
short-circuit)
• Poor contact of temperature sensor connector
Replacement, repair
of temperature
sensor
65
Indoor control PCB
*
•
Defective indoor control PCB (Defective temperature sensor input
circuit)?
Replacement of
PCB
1-time
flash
Keeps
flashing Stays OFF
Keeps
flashing
Installation or oper-
ating condition
•
Heating over-load
(Anomalously high indoor heat exchanger temperature)
Repair
66
Indoor heat
exchanger tempera-
ture sensor
•
Defective indoor heat exchanger temperature sensor (short-circuit)
Replacement of
temperature sensor
Indoor control PCB
*
•
Defective indoor control PCB
(Defective temperature sensor input circuit)?
Replacement of
PCB
1-time
flash
Keeps
flashing Stays OFF
Keeps
flashing
Drain trouble
•
Defective drain pump (DM), broken drain pump wire
, disconnected connector
Replacement, repair
of DM
67
Float switch
•
Anomalous float switch operation
(malfunction)
Repair
Indoor control PCB
*
•
Defective indoor control PCB
(Defective float switch input circuit)
*
•
Defective indoor control PCB
(Defective DM drive output circuit)?
Replacement of
PCB
Option
•
Defective option parts
(At option anomalous input setting)
Repair
Stays OFF
Keeps
flashing Stays OFF
Keeps
flashing
Number of connect-
ed indoor units
•
When multi-unit control by remote control is performed, the number of units
is over
Repair
68
Keeps
flashing
Keeps
flashing Stays OFF
Keeps
flashing
Address
setting error
•
Address setting error of indoor units
Repair
69
1(2)-time
flash
Keeps
flashing Stays OFF
Keeps
flashing
Fan motor
•
Defective fan motor
Replacement, repair
70
Indoor power PCB •
Defective indoor power PCB
Replacement
1-time
flash
Keeps
flashing Stays OFF
Keeps
flashing Indoor control PCB •
Improper operation mode setting
Repair
71
1(2)-time
flash
Keeps
flashing Stays OFF
Keeps
flashing
Fan motor
• Indoor fan motor rotation speed anomaly
Replacement, repair
72
Indoor power PCB • Defective indoor power PCB
Replacement
Stays OFF
Keeps
flashing Stays OFF
Keeps
flashing
Remote control
temperature sensor • Broken wire of remote control temperature sensor
Repair
73
Note (1)
Normal indicator lamp (Indoor, outdoor units: Green) extinguishes (or lights continuously) only when CPU is anomalous.
It keeps flashing in any trouble other than anomalous CPU.
(2) * mark in the description of trouble means that, in ordinary diagnosis, it cannot identify the cause definitely, and, if the trouble is repaired by replacing
the part, it is judged consequently that the replaced part was defective.
Summary of Contents for FDE40ZSXW1VH
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