Self-Diagnosis Table - Mitsubishi Heavy Industries SRK15ZTL-W Service Manual

(5) Self-diagnosis table

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Indoor unit display panel
RUN TIMER
light light
1-time
ON
flash
2-time
ON
flash
3-time
ON
flash
6-time
ON
flash
Keeps
1-time
flashing
flash
2-time
Keeps
flashing
flash
4-time
Keeps
flashing
flash
1-time
ON
flash
2-time
ON
flash
3-time
ON
flash
4-time
ON
flash
5-time
ON
flash
6-time
ON
flash
7-time
ON
flash
Keeps
ON
flashing
2-time 2-time
flash flash
4-time
ON
flash
5-time
ON
flash
7-time
ON
flash
7-time 1-time
flash
flash
— —
-
-
-
Wired
(2)
Description
remote
control
of trouble
display
• Broken heat exchanger temperature
Heat exchanger
sensor 1 wire, poor connector
—
temperature
connection
sensor 1 error
• Indoor unit PCB is faulty
• Broken room temperature
Room air
sensor wire, poor connector
—
temperature
connection
sensor error
• Indoor unit PCB is faulty
• Broken heat exchanger temperature
Heat exchanger
sensor 2 wire, poor connector
—
temperature
connection
sensor 2 error
• Indoor unit PCB is faulty
Indoor fan • Defective fan motor, poor
E 16
motor error connector connection
• Broken outdoor air temperature
Outdoor air
sensor wire, poor connector
E 38 temperature
connection
sensor error
• Outdoor unit PCB is faulty
Outdoor heat • Broken heat exchanger temperature
exchanger sensor wire, poor connector
E 37
temperature connection
sensor error • Outdoor unit PCB is faulty
• Broken discharge pipe temperature
Discharge pipe
sensor wire, poor connector
E 39 temperature
connection
sensor error
• Outdoor unit PCB is faulty
• Compressor locking, open phase
on compressor output, short-
E 42 Current cut
circuit on power transistor
service valve is closed
Trouble of • Broken compressor wire
E 59
outdoor unit • Compressor blockage
• Overload operation
Current safe
• Overcharge
E 58
stop
• Compressor locking
Power
E 51 • Broken power transistor
transistor error
• Gas shortage, defective
Over heat of
E 36 dischar
compressor
sensor, service valve is closed
• Defective power source,
Error of signal
E 5
Broken signal wire, defective
transmission
indoor/outdoor unit PCB
Outdoor fan
• Defective fan motor, poor
E 48
motor error
connector connection
• Overload operation, overcharge
Cooling high
• Broken outdoor heat exchanger
E 35 pressure
temperature sensor wire
protecton
• Service valve is closed
• Defective compressor
E 60
Rotor lock • Open phase on compressor
• Defective outdoor unit PCB
• Defective wireless LAN
Trouble of
— interface boards, poor connector
wireless LAN
connection
interface
Active filter
• Defective active filter
E 47
voltage error
Refrigeration
• Service valve is closed.
cycle system
E 57
• Refrigerant is insufficient
protective
control
Service valve
• Service valve (gas side) closed
(gas side)
E 40
• Defective outdoor unit PCB
closed opertion
Error of wired
• Broken wired remote control
E 1
remote control
wire, defective indoor unit PCB
wiring
Cause
When a heat exchanger temperature 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 temperature 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.)
When conditions for turning the indoor fan motor on exist during air
-conditioner operation, an indoor 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 temperature sensor
ge pipe temperature
exceeds the set value.(The air-conditioner stops.)
When there is no signal between the indoor unit PCB and
outdoor unit 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 fan motor speed continues for 30 seconds
or longer at 75 min
stops.)
When the value of the outdoor heat exchanger temperature
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 normal data cannot be received from wireless LAN
interface for two minutes continuously
When the wrong voltage connected for the power source.
When the outdoor unit PCB is faulty
When refrigeration cycle system protective control operates.
If the output current of inverter exceeds the specifications, it makes the compressor stopping. (In heating mode).
After 3-minute delay, the compressor restarts, but if this anomaly occurs
2 times within 20 minutes after the initial detection.
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 unit PCB is faulty. (The communications circuit is faulty.)
23
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'22 • SRK-SM-349
Display (flashing) condition
or lower. (3 times) (The air-conditioner
-1
.
-1