Self-Diagnosis Table - Mitsubishi SRK25ZMP-S Technical Manual

(5) Self-diagnosis table

When this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of
display lights. If the air conditioner is operated using the remote control 3 minutes or more after the emergency stop, the trouble
display stops and the air conditioner resumes operation.
Indoor unit display section
Description
RUN TIMER
light light
1‐time
Indoor heat exchanger
ON
flash
sensor error
Room
2‐time
ON
temperature
flash
sensor error
5‐time
Active filter
ON
voltage error
flash
Indoor fan
6‐time
ON
motor error
flash
Refrigeration
cycle system
7‐time
ON
protective
flash
control
Outdoor air
Keeps
1‐time
temperature
flashing
flash
sensor error
Outdoor heat
2‐time
Keeps
exchanger
flash
flashing
sensor error
Keeps
Discharge pipe
4‐time
flashing sensor error
flash
1‐time
ON
Current cut
flash
2‐time
Trouble of
ON
outdoor unit
flash
Current safe
3‐time
ON
stop
flash
4‐time
Power transistor
ON
error
flash
5‐time Over heat of
ON
compressor
flash
6‐time
Error of signal
ON
flash transmission
Outdoor fan
7‐time
ON
motor error
flash
Cooling high
Keeps
ON pressure
flashing
protection
2‐time 2‐time
Rotor lock
flash flash
Notes (1) The air conditioner cannot be restarted using the remote control for 3 minutes after operation stops.
Cause
of trouble
• Broken heat exchanger sensor
wire, poor connector
connection
• Indoor PCB is faulty
• Broken room temperature
sensor wire, poor connector
connection
• Indoor PCB is faulty
• Defective active filter
• Defective fan motor, poor
connector connection
• Service valve is closed.
• Refrigerant is insufficient
• Broken outdoor air temp.
sensor wire, poor connector
connection
• Outdoor PCB is faulty
• Broken heat exchanger sensor
wire, poor connector
connection
• Outdoor PCB is faulty
• Broken discharge pipe sensor
wire, poor connector
connection
• Outdoor PCB is faulty
• Compressor locking, open
phase on compressor output,
shortcircuit on power
transistor, closed service valve
• Broken compressor wire
• Compressor blockage
• Overload operation
• Overcharge
• Compressor locking
• Broken power transistor
• Gas shortage, defective
discharge pipe sensor, closed
service valve
• Defective power supply,
Broken signal wire, defective
indoor/outdoor PCB
• Defective fan motor, poor
connector connection
• Overload operation, over charge
• Broken outdoor heat exchange
sensor wire
• Service valve is closed.
• Defective compressor
• Open phase on compressor
• Defective outdoor PCB
(1)
Display (flashing) condition
When a heat exchanger sensor 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 the wrong voltage connected for the power supply.
When the outdoor PCB is faulty.
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.)
When refrigeration cycle system protective control operates.
-55℃ or lower is detected for 5 seconds continuously 3 times within 40 minutes
after initial detection of this anomalous temperature.
Or -55℃ or higher is detected for within 20 seconds after power ON.
(The compressor is stopped.)
-55℃ or lower is detected for 5 seconds continuously 3 times within 40 minutes
after initial detection of this anomalous temperature.
Or -55℃ or higher is detected for within 20 seconds after power ON.
(The compressor is stopped.)
-25℃ 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 inverter output current (compressor motor current) exceeds the set value
during compressor start.
(The air conditioner stops.)
When there is an emergency stop caused by trouble in the outdoor unit, or the
input current value is found to be lower than the set value.
(The air conditioner stops.)
When the compressor command speed is lower than the set value and the current
safe has operated. (The compressor is stopped.)
When there is an emergency stop caused by trouble in the outdoor unit, or the
input current value is found to be lower than the set value continuously for 3
minutes or longer.
(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 sped continues for 30 seconds or longer at
75 rpm or lower. (3 times) (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.)
42
- -
'13 • SRK-T-140
-1 or lower is