Mitsubishi Heavy Industries SCM80ZS-W User Manual

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100
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'19 • SCM-SM-276
2.2 FDTC, FDUM and FDE series
2.2.1
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
main PCB
Location of trouble Description of trouble Repair method
Reference
page
Error code Red LED Red LED
Green
LED (1)
Red LED
No-indication Stays OFF
Stays OFF
Keeps
flashing
Stays OFF —
• Normal operation
—
—
Stays OFF Stays OFF Stays OFF Indoor unit power source • Power OFF, broken wire/blown fuse, broken transformer wire Repair 119
*
3-time
flash
Keeps
flashing
Stays OFF
Remote control wires • Poor connection, breakage of remote control wire * For wire breaking at power ON, the LED is OFF. Repair
120
Remote control • Defective remote control PCB
Replacement of
remote control
WAIT
or
INSPECT I/U
Stays OFF
Keeps
flashing
Stays OFF
Indoor-outdoor units connection
wire
• Poor connection, breakage of indoor-outdoor units connection wire
Repair
121−125
Remote control • Improper setting of master and slave by remote control
Keeps
flashing
Stays OFF
*
Keeps
flashing
Stays OFF
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
127
Remote control indoor unit
control PCB
*• Defective remote control or indoor unit control PCB (defective communication circuit)?
Replacement of
remote control or
PCB
2-time
flash
Keeps
flashing
6-time
flash
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
128
2-time
flash
Keeps
flashing
6-time
flash
(Noise) • CPU-runaway on outdoor unit control PCB
Power reset or
Repair
Outdoor unit control PCB
*• Occurrence of defective outdoor unit control PCB on the way of power source (defective communica-
tion circuit)?
Replacement of
PCB
2-time
flash
Keeps
flashing
6-time
flash
Outdoor unit control PCB • Defective outdoor unit control PCB on the way of power source
Replacement
Fuse • Blown fuse
1-time
flash
Keeps
flashing
Stays OFF
Indoor heat exchanger
temperature sensor
• Defective indoor heat exchanger temperature sensor (defective element, broken wire, short-
circuit)
• Poor contact of temperature sensor connector
Replacement,
repair of
temperature sensor
129
Indoor unit control PCB
*• Defective indoor unit control PCB (Defective temperature sensor input circuit)?
Replacement of
PCB
1-time
flash
Keeps
flashing
Stays OFF
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
130
Indoor control PCB
*• Defective indoor unit control PCB (Defective temperature sensor input circuit)?
Replacement of
PCB
1-time
flash
Keeps
flashing
Stays OFF
Installation or operating condi-
tion
• Heating over-load (Anomalously high indoor heat exchanger temperature) Repair
131
Indoor heat exchanger
temperature sensor
• Defective indoor heat exchanger temperature sensor (short-circuit)
Replacement
of temperature
sensor
Indoor unit control PCB
*• Defective indoor unit control PCB (Defective temperature sensor input circuit)?
Replacement of
PCB
1-time
flash
Keeps
flashing
Stays OFF
Drain trouble • Defective drain pump (DM), broken drain pump wire, disconnected connector
Replacement,
repair of DM
132
Float switch • Anomalous float switch operation (malfunction) Repair
Indoor unit control PCB
*• Defective indoor unit control unit PCB (Defective float switch input circuit)
*• Defective indoor unit control unit PCB (Defective DM drive output circuit)?
Replacement of
PCB
Option • Defective option parts (At optional anomalous input setting) Repair
Stays OFF
Keeps
flashing
Stays OFF
Number of connected indoor
units
• When multi-unit control by remote control is performed, the number of units is over Repair
133
Keeps
flashing
Keeps
flashing
Stays OFF
Address
setting error
• Address setting error of indoor units Repair
134
1-time
flash
Keeps
flashing
Stays OFF
Fan motor • Defective fan motor
Replacement,
repair
135
Indoor unit control PCB • Defective indoor unit control PCB Replacement
1-time
flash
Keeps
flashing
Stays OFF Indoor unit control PCB • Improper operation mode setting Repair
136
1-time
flash
Keeps
flashing
Stays OFF
Fan motor • Indoor fan motor rotation speed anomaly
Replacement, repair
137
Indoor unit power PCB • Defective indoor unit power PCB Replacement
Stays OFF
Keeps
flashing
Stays OFF
Remote control temperature
sensor
• Broken wire of remote control temperature sensor Repair
138
Note (1)
Normal indicator lamp (Indoor unit: 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 denitely, and, if the trouble is repaired by replacing
the part, it is judged consequently that the replaced part was defective.
(In case of FDTC, FDUM)

Mitsubishi Heavy Industries SCM80ZS-W Specifications

General

Brand	Mitsubishi Heavy Industries
Model	SCM80ZS-W
Category	Air Conditioner
Language	English