Mitsubishi Heavy Industries SRK20ZD-S1 Technical Manual page 44

Number of flashes
when in service mode
Stop code
or
RUN TIMER
light Error code
light
Major category
(10's digit)
(1's digit)
Current
4 time 1 time 41
flash flash
2 time 42
flash
3 time
43
flash
4 time
44
flash
5 time
45
flash
46
6 time
flash
Compressor
5 time OFF 50
overheat
flash
Serial signal
6 time OFF
60
transmission
flash
1 time 61
flash
2 time 62
flash
7 time 1 time
71
Rotor lock
flash flash
2 time 72
flash
3 time 73
flash
4 time 74
flash
5 time 75
flash
6 time 76
flash
Protective
8 time OFF
80
flash
operation
1 time 81
flash
2 time
82
flash
3 time
83
flash
4 time
84
flash
5 time
85
flash
6 time 86
flash
7 time 87
flash
8 time
88
flash
Error content
Minor category
Cooling overload 1
safe
(outdoor temperature:
36~40ºC)
Heating overload 1
(outdoor temperature:
5~12ºC)
Cooling overload 2
(outdoor temperature:
40~45ºC)
Heating overload 2
(outdoor temperature:
12~17ºC)
Cooling overload 3
(outdoor temperature:
45ºC~)
Heating overload 3
(outdoor temperature:
17ºC~)
125ºC
Can't receive signals for 1 minute
55 seconds (if communications
error
have recovered)
Connection lines between the
indoor and outdoor units are faulty.
Serial transmission error.
Less than 16 rps
16 rps or higher
Phase switching defects
(U phase)
Phase switching defects
(V phase)
Phase switching defects
(W phase or impossible to
distinguish).
Compressor software start
(within 4 seconds after
phase switching)
Indoor unit fan motor is
control
abnormal.
Discharge pipe sensor is
abnormal (anomalous stop).
Indoor heat exchanger sensor
is abnormal (anomalous stop).
Outdoor heat exchanger sensor is
abnormal (anomalous stop).
Anti-condensation control
Anti-frost control
High pressure control
Compressor overheating
protection control
Refrigeration cycle system
protective control
Cause
Overcharge
When there is a current safe stop in overload 1 mode
Compressor lock
during cooling operation.
Overload operation
Overcharge
When there is a current safe stop in overload 1 mode
Compressor lock
during heating operation.
Overload operation
Overcharge
When there is a current safe stop in overload 2 mode
Compressor lock
during cooling operation.
Overload operation
Overcharge When there is a current safe stop in overload 2 mode
Compressor lock during heating operation.
Overload operation
Overcharge When there is a current safe stop in overload 3 mode
Compressor lock during cooling operation.
Overload operation
Overcharge
When there is a current safe stop in overload 3 mode
Compressor lock
during heating operation.
Overload operation
Refrigerant is insuffcient.
When the discharge pipe sensor's value exceeds the set
Discharge pipe sensor is faulty.
value.
Service valve is closed.
Power supply is faulty.
When 1 minute 55 seconds passes without
Power supply cables and signal lines are improperly wired.
communications signals from either the outdoor unit or
Indoor or outdoor unit circuit board is faulty.
the indoor unit being detected correctly.
Connection lines between the indoor and
When 10 seconds passes after the power is turned on without communications
outdoor units are faulty.
signals from the indoor or outdoor unit being detected correctly.
Indoor or outdoor unit circuit boards are faulty.
Indoor or outdoor unit circuit boards
When 1 minute 50 seconds passes without communications signals
are faulty.
from either the outdoor unit or the indoor unit being detected correctly.
Noise is causing faulty operation.
After the compressor starts, when the compressor stops at
Compressor is faulty
less than 16 rps due to rotor lock.
Compressor output is open phase
Electronic expansion valve is faulty.
Overload operation
Outdoor unit circuit board is faulty.
Compressor is faulty When the compressor stops at 16 rps or higher speed due
Compressor output is open phase to rotor lock.
Electronic expansion valve is faulty.
Overload operation
Outdoor unit circuit board is faulty.
When compressor start fails 42 times in succession and
Compressor is faulty
the reason for the final failure is rotor lock.
Compressor wiring is disconnected.
Compressor wiring is short circuited.
Outdoor unit's circuit board is faulty.
Compressor is faulty When compressor start fails 42 times in succession and
Compressor wiring is disconnected. the reason for the final failure is rotor lock.
Compressor wiring is short circuited.
Outdoor unit's circuit board is faulty.
When compressor start fails 42 times in succession and
Compressor is faulty
the reason for the final failure is rotor lock.
Compressor wiring is disconnected.
Compressor wiring is short circuited.
Outdoor unit's circuit board is faulty.
When compressor start fails 42 times in succession and
Compressor is faulty
the reason for the final failure is rotor lock.
Compressor wiring is disconnected.
Compressor wiring is short circuited.
Outdoor unit's circuit board is faulty.
When the indoor unit's fan motor is detected to be
Fan motor is faulty.
running at 300 rpm or lower speed with the fan motor in
Connector connections are poor.
the ON condition while the air conditioner is running.
Indoor unit circuit board is faulty.
When a disconnection signal (temperature below 7ºC) is sent for
Discharge pipe sensor wire is
15 seconds or longer as the discharge pipe sensor data after the
disconnected.
outdoor unit's speed is 0 rps or higher continuously for 9 minutes.
Connector connections are poor.
Indoor heat exchanger sensor wire is
When a temperature of –20ºC or lower is sensed continuously
disconnected.
for 40 minutes during heating operation (the compressor stops).
Connector connections are poor.
Outdoor heat exchanger sensor
When a temperature of –50ºC or lower is sensed continuously
wire is disconnected.
for 40 minutes during heating operation (the compressor stops).
Connector connections are poor.
High humidity condition.
Anti-condensation prevention control is operating.
Humidity sensor is faulty.
Indoor unit fan speed drops.
When the anti-frost control operates and the compressor
Indoor heat exchanger sensor short circuit
stops during cooling operation.
Heating overload
When high pressure control operates during heating
Indoor unit fan speed drops
operation and the compressor stops.
Indoor heat exchanger sensor short circuit
When compressor overheating protective control operates
Refrigerant is insufficient.
and the compressor stops.
Discharge pipe sensor is faulty.
Service valve is closed.
Service valve is closed. When refrigeration cycle system protective control
Refrigerant is insufficient. operates.
42
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Occurrence conditions
Auto
Error
recovery
display
-
-
-
-
-
-
(2 times)
-
-
(3 times)
-
-
(2 times)
(2 times)
(2 times)
(2 times)
-
(4 times)
-
-
-
-
-
-
-