Self-Diagnosis Table - Mitsubishi SRK20ZSX-W Technical Manual

(5) Self-diagnosis table

air-conditioner
Wired
(2)
Indoor unit display panel
remote
control
RUN TIMER
display
light light
1-time
ON —
flash
2-time
ON —
flash
3-time
ON —
flash
6-time
ON E 16
flash
Keeps
1-time
E 38
flashing
flash
2-time
Keeps
E 37
flashing
flash
Keeps 4-time
E 39
flashing flash
1-time
ON E 42
flash
2-time
ON E 59
flash
3-time
ON E 58
flash
4-time
ON E 51
flash
5-time
ON E 36
flash
6-time
E 5
ON
flash
7-time
ON E 48
flash
Keeps
ON E 35
flashing
2-time 2-time
E 60
flash flash
5-time
ON E 47
flash
7-time
ON E 57
flash
— — E 1
Stays Keeps
—
OFF flashing
air-conditioner
air-conditioner
air-conditioner
Description
Cause
of trouble
• Broken heat exchanger sensor
Heat exchanger 1 wire, poor connector
sensor 1 error connection
• Indoor PCB is faulty
• Broken room temperature
Room
sensor wire, poor connector
temperature
connection
sensor error
• Indoor PCB is faulty
• Broken heat exchanger sensor
2 wire, poor connector
Heat exchanger
connection
sensor 2 error
• Indoor PCB is faulty
Indoor fan • Defective fan motor, poor
motor error connector connection
• Broken outdoor air temp.
Outdoor air
sensor wire, poor connector
temperature
connection
sensor error
• Outdoor PCB is faulty
• Broken heat exchanger sensor
Outdoor heat
wire, poor connector
exchanger
connection
sensor error
• Outdoor PCB is faulty
• Broken discharge pipe sensor
Discharge pipe wire, poor connector
sensor error connection
• Outdoor PCB is faulty
• Compressor locking, open phase
on compressor output, short
Current cut
circuit on power transistor
service valve is closed
Trouble of • Broken compressor wire
outdoor unit • Compressor blockage
• Overload operation
Current safe
• Overcharge
stop
• Compressor locking
Power
transistor • Broken power transistor
error
• Gas shortage, defective
Over heat of
discharge pipe sensor, service
compressor
valve is closed
• Defective power source,
Error of signal
Broken signal wire, defective
transmission
indoor/outdoor PCB
Outdoor fan
• Defective fan motor, poor
motor error
connector connection
• Overload operation, overcharge
Cooling high
• Broken outdoor heat exchange
pressure
sensor wire
protecton
• Service valve is closed
• Defective compressor
Rotor lock • Open phase on compressor
• Defective outdoor PCB
Active filter
• Defective active filter
voltage error
Refrigeration
• Service valve is closed.
cycle system
• Refrigerant is insufficient
protective
control
Error of wired
• Broken wired remote control
remote control
wire, defective indoor PCB
wiring
• Defective limit switch
Limit switch
• Defective suction panel set
error
• Defective indoor contro PCB
Display (flashing) condition
When a heat exchanger sensor 1 wire disconnection is detected while
operation is stopped. (If a temperature of –28ºC or lower is detected for
15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
When a room temperature sensor wire disconnection is detected while
operation is stopped. (If a temperature of –45ºC or lower is detected for
15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
When a heat exchanger sensor 2 wire disconnection is detected while
operation is stopped. (If a temperature of –28ºC or lower is detected for
15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
When conditions for turning the indoor unit's fan motor on exist during air-
conditioner operation, an indoor unit fan motor speed of 300 min
measured for 30 seconds or longer. (The air-conditioner stops.)
–55ºC or lower is detected for 5 seconds continuously 3 times within
40 minutes after initial detection of this anomalous temperature.
Or –55ºC or lower is detected for within 20 seconds after power ON.
(The compressor is stopped.)
–55ºC or lower is detected for 5 seconds continuously 3 times within
40 minutes after initial detection of this anomalous temperature.
Or –55ºC or lower is detected for within 20 seconds after power ON.
(The compressor is stopped.)
–25ºC or lower is detected for 5 seconds continuously 3 times within 40
minutes after initial detection of this anomalous temperature.
(The compressor is stopped.)
The compressor output current exceeds the set value during compressor
start.
,
(The air-conditioner stops.)
When there is an emer
or the input current value is found to be lower than the set value.
(The air-conditioner stops.)
When the compressor speed is lower than the set value and the current
safe has operated.
(The compressor stops)
When the power transistor is judged breakdown while compressor
starts.
(The compressor is stopped.)
When the value of the discharge pipe sensor exceeds the set value.
(The air-conditioner stops.)
When there is no signal between the indoor PCB and outdoor PCB for
10 seconds or longer (when the power is turned on), or when there is no
signal for 7 minute 35 seconds or longer (during operation)
(The compressor is stopped).
When the outdoor unit's fan motor speed continues for 30 seconds or
longer at 75 min or lower. (3 times)
-1
(The air-conditioner stops.)
When the value of the outdoor heat exchanger sensor exceeds the set
value.
If the compressor motor's magnetic pole positions cannot be correctly
detected when the compressor starts.
(The air-conditioner stops.)
When the wrong voltage connected for the power source.
When the outdoor PCB is faulty.
When refrigeration cycle system protective control operates.
The wired remote control wire Y is open. The wired remote
control wires X and Y are reversely connected. Noise is penetrating
the wired remote control lines. The wired remote control or indoor
PCB is faulty. (The communications circuit is faulty.)
Actuation of limit switch
83
- -
'09•SRK-DB-087D
'18 • SRK-T-234
gency stop caused by trouble in the outdoor unit,
or lower is
-1