Mitsubishi Heavy Industries SRK20ZG-S Tech Manual page 37

(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.
Wired
Indoor unit display panel
remote
control
RUN TIMER
display
light light
1 time
ON E 6
flash
2 time
ON E 7
flash
6 time
ON E 16
flash
Keeps
1 time E 38
flashing
flash
2 time
Keeps
E 37
flash
flashing
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
5 time
ON E 41
flash
5 time
ON E 36
flash
6 time
ON E 5
flash
7 time
ON E 48
flash
2 time 2 time
E 60
flash flash
— — E 1
Notes (1)The air conditioner cannot be restarted using the remote control for 3 minutes after operation stops.
(2)The wired remote control is optional parts.
(1)
Description
Cause
of trouble
• Broken heat exchanger sensor
Heat exchanger
wire, poor connector
sensor error
connection
Room • Broken room temperature
temperature sensor wire, poor connector
sensor error connection
• Defective fan motor, poor
Indoor fan
connector connection
motor error
Outdoor air • Broken outdoor air temp.
temperature sensor wire, poor connector
sensor error connection
• Broken heat exchanger sensor
Outdoor heat
wire, poor connector
exchanger
connection
sensor error
• Broken discharge pipe sensor
Discharge pipe
wire, poor connector
sensor error
connection
• Compressor locking, open
phase on compressor output,
shortcircuit on power
Current Cut
transistor, closed service valve
• Broken compressor wire
• Broken discharge pipe sensor
Trouble of
wire, poor connector
outdoor unit
connection
• 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, closed
compressor
service valve
• Defective power supply,
Error of signal
Broken signal wire, defective
transmission
in/outdoor unit boards
• Defective fan motor, poor
Outdoor fan
connector connection
motor error
• Defective compressor
Rotor lock • Open phase on compressor
• Defective outdoor unit boards
• Broken wired remote control
Error of wired
wire, defective indoor unit
remote control
boards
wiring
When a heat exchanger sensor wire disconnection is detected while
operation is stopped. (If a temperature of –20ºC 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 –20ºC 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 rpm or
lower is measured for 30 seconds or longer. (The air conditioner stops.)
When an outdoor temperature sensor wire disconnection is detected
while operation is stopped. (If a temperature of –40ºC or lower is
detected for 15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
When a sensor wire disconnection is detected while operation is
stopped. (If a temperature of –50ºC or lower is detected for 15 seconds,
it is judged that the wire is disconnected.)
(Not displayed during operation.)
When a compressor discharge pipe sensor wire disconnection is
detected for 15 seconds or longer (less than 7ºC) after the outdoor
unit's speed has continued at 0 rps or higher for 9 minutes.
(The air conditioner stops.)
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
continuously for 3 minutes or longer.
(The air conditioner stops.)
When the inverter command speed is 20 rps or less and the current safe
has operated. (the compressor 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
continuously for 3 minutes or longer.
(The air conditioner stops.)
When the value of the discharge pipe sensor exceeds the set value.
(The air conditioner stops.)
When there is no signal between the indoor unit's board and outdoor
unit's board for 10 seconds or longer (when the power is turned on), or
when there is no signal for 1 minute 50 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.)
If the compressor motor's magnetic pole positions cannot be correctly
detected when the compressor starts.
(The air conditioner stops.)
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 control PCB is
faulty. (The communications circuit is faulty.)
34
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Display (flashing) condition