Self-Diagnosis Table - Mitsubishi Heavy Industries SRR25ZM-S Technical Manual

(5) Self-diagnosis table

-
Wired
Indoor unit display panel
remote
control
RUN TIMER
display
light light
1-time
ON
flash
2-time
ON
flash
3-time
ON
flash
4-time
ON
flash
6-time
ON E 16
flash
Keeps
1-time
E 38
flashing
flash
Keeps 2-time
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
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
— —
-
-
-
(2)
Description
of trouble
• Broken heat exchanger sensor
1 wire, poor connector
Heat exchanger
—
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
• Defective drain pump (DM),
broken drain pump wire
E 9
Drain trouble
• Anomalous float switch operation
Defective indoor PCB 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
• Broken power transistor
transistor error
• Gas shortage, defective
Over heat of
discharge pipe sensor, service
compressor
valve is closed
• Defective power source,
Error of signal
E 5
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
E 1
remote control
wire, defective indoor PCB
wiring
Cause 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 discon-
nected.) (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 disco-
nnected.) (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 discon-
nected.)(Not displayed during operation.)
If the float switch OPEN is defected for 3 seconds
continuously or if float switch connector or wire is
disconnected.
When conditions for turning the indoor unit's fan motor on exist during air
-conditioner operation, an indoor unit fan motor speed of 300min
or lower is 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 higher 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 higher 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 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 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
-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.)

- -
'15 • SR-T-185
-1
or lower. (3 times) (The air
-1