Mitsubishi SRK52HE Technical Manual page 46

(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
Wired
display panel
remote
Run control
Timer
light display
light
6 time
ON
flash
1 time
ON
flash
2 time
ON
flash
6 time
ON E 16
flash
5 time
ON E 36
flash
2 time
Keeps
E 37
flashing flash
Keeps
1 time
E 38
flashing
flash
Keeps
4 time
E 39
flashing
flash
2 time
ON E 59
flash
— —
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.
Description
of trouble
• Defective power supply,
Error of signal
Broken signal wire,
E 5
transmission
defective in/outdoor unit
boards
• Broken heat exchanger
Heat exchanger
E 6
sensor wire, poor connector
sensor error
connection
Room • Broken room temperature
temperature
E 7 sensor wire, poor connector
sensor error
connection
• Defective fan motor, poor
Indoor fan
connector connection
motor error
• Gas shortage, defective
Over heat of
discharge pipe sensor,
compressor
closed service valve
• Broken heat exchanger
Outdoor heat
sensor wire, poor connector
exchanger
connection
sensor error
• Broken outdoor air temp.
Outdoor air
sensor wire, poor connector
temperature
connection
sensor error
• Broken discharge pipe
Discharge pipe
sensor wire, poor connector
sensor error
connection
• Broken compressor wire
• Broken discharge pipe
Abnormality of
sensor wire, poor connector
outdoor unit
connection
• Compressor blockage
• Broken wired remote control
Error of wired
wire, defective in door unit
E 1 remote control
boards
wiring
(1)
Cause
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 a heat exchanger sensor wire disconnection is detected while
operation is stopped. (If a temperature of –20ºC or lower is detected for
3 minutes, 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 the value of the discharge pipe sensor exceeds the set value.
(The air conditioner stops.)
When a sensor wire disconnection is detected while operation is
stopped. (If a temperature of –64ºC or lower is detected for 15 seconds,
it is judged that the wire is disconnected.) (Not displayed during
operation.)
When an outdoor air temperature sensor wire disconnection is detected
while operation is stopped. (If a temperature of –64ºC or lower is
detected for 15 seconds, it is judged that the wire is disconnected.) (Not
displayed during operation.)
After the compressor has operated for 9 minutes continuously, if there
is a disconnected signal for the discharge pipe temperature sensor
detected -64°C for 15 seconds.
Cooling operation
When the indoor heat exchanger temperature does not fall to 25°C or
below for 40 minutes after 5 minutes have elapsed since the compressor
operation start.
Heating operation
1 The indoor heat exchanger temperature < 5°C for 5 minutes and
more
2 5°C < = the indoor heat exchanger temperature < 30°C for 40 minutes
and more
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.)
44
- -
Display (flashing) condition