Mitsubishi Heavy Industries SRK20ZG-S Tech Manual page 41

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
control
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
Overcharge
Cooling overload 1
safe
Compressor lock
(outdoor temperature:
Overload operation
36~40ºC)
Overcharge
Heating overload 1
Compressor lock
(outdoor temperature:
Overload operation
5~12ºC)
Overcharge
Cooling overload 2
Compressor lock
(outdoor temperature:
Overload operation
40~45ºC)
Overcharge
Heating overload 2
Compressor lock
(outdoor temperature:
Overload operation
12~17ºC)
Overcharge
Cooling overload 3
Compressor lock
(outdoor temperature:
Overload operation
45ºC~)
Overcharge
Heating overload 3
Compressor lock
(outdoor temperature:
Overload operation
17ºC~)
Refrigerant is insufficient.
110ºC(50Z)
Discharge pipe sensor is faulty.
125ºC(20~35Z)
Service valve is closed.
Power supply is faulty.
Can't receive signals for 1 minute
Power supply cables and signal lines are improperly wired.
55 seconds (if communications
error
Indoor or outdoor unit circuit board is faulty.
have recovered)
Connection lines between the indoor and
Connection lines between the
outdoor units are faulty.
indoor and outdoor units are faulty.
Indoor or outdoor unit circuit boards are faulty.
Indoor or outdoor unit circuit boards
Serial transmission error.
are faulty.
Noise is causing faulty operation.
Less than 16 rps
Compressor is faulty
Compressor output is open phase
Electronic expansion valve is faulty.
Overload operation
Outdoor unit circuit board is faulty.
16 rps or higher Compressor is faulty
Compressor output is open phase
Electronic expansion valve is faulty.
Overload operation
Outdoor unit circuit board is faulty.
Compressor is faulty
Phase switching defects
Compressor wiring is disconnected.
(U phase)
Compressor wiring is short circuited.
Outdoor unit's circuit board is faulty.
Compressor is faulty
Phase switching defects
Compressor wiring is disconnected.
(V phase)
Compressor wiring is short circuited.
Outdoor unit's circuit board is faulty.
Compressor is faulty
Phase switching defects
Compressor wiring is disconnected.
(W phase or impossible to
Compressor wiring is short circuited.
distinguish).
Outdoor unit's circuit board is faulty.
Compressor is faulty
Compressor software start
Compressor wiring is disconnected.
(within 4 seconds after
Compressor wiring is short circuited.
phase switching)
Outdoor unit's circuit board is faulty.
Fan motor is faulty.
Indoor unit fan motor is
abnormal. Connector connections are poor.
Indoor unit circuit board is faulty.
Discharge pipe sensor wire is
Discharge pipe sensor is
disconnected.
abnormal (anomalous stop).
Connector connections are poor.
Indoor heat exchanger sensor wire is
Indoor heat exchanger sensor
disconnected.
is abnormal (anomalous stop).
Connector connections are poor.
Outdoor heat exchanger sensor wire
Outdoor heat exchanger sensor is
is disconnected.
abnormal (anomalous stop).
Connector connections are poor.
High humidity condition.
Anti-condensation control
Humidity sensor is faulty.
Indoor unit fan speed drops.
Anti-frost control
Indoor heat exchanger sensor short circuit
Heating overload
High pressure control
Indoor unit fan speed drops
Indoor heat exchanger sensor short circuit
Compressor overheating Refrigerant is insufficient.
Discharge pipe sensor is faulty.
protection control
Service valve is closed.
Service valve is closed.
Refrigeration cycle system
Refrigerant is insufficient.
protective control
Cause
When there is a current safe stop in overload 1 mode
during cooling operation.
When there is a current safe stop in overload 1 mode
during heating operation.
When there is a current safe stop in overload 2 mode
during cooling operation.
When there is a current safe stop in overload 2 mode
during heating operation.
When there is a current safe stop in overload 3 mode
during cooling operation.
When there is a current safe stop in overload 3 mode
during heating operation.
When the discharge pipe sensor's value exceeds the set
value.
When 1 minute 55 seconds passes without
communications signals from either the outdoor unit or
the indoor unit being detected correctly.
When 10 seconds passes after the power is turned on without communications
signals from the indoor or outdoor unit being detected correctly.
When 1 minute 50 seconds passes without communications signals
from either the outdoor unit or the indoor unit being detected correctly.
After the compressor starts, when the compressor stops at
less than 16 rps due to rotor lock.
When the compressor stops at 16 rps or higher speed due
to rotor lock.
When compressor start fails 42 times in succession and
the reason for the final failure is rotor lock.
When compressor start fails 42 times in succession and
the reason for the final failure is rotor lock.
When compressor start fails 42 times in succession and
the reason for the final failure is rotor lock.
When compressor start fails 42 times in succession and
the reason for the final failure is rotor lock.
When the indoor unit's fan motor is detected to be
running at 300 rpm or lower speed with the fan motor in
the ON condition while the air conditioner is running.
When a disconnection signal (temperature below 7ºC) is sent for
15 seconds or longer as the discharge pipe sensor data after the
outdoor unit's speed is 0 rps or higher continuously for 9 minutes.
When a temperature of –20ºC or lower is sensed continuously
for 40 minutes during heating operation (the compressor stops).
When a temperature of –50ºC or lower is sensed continuously
for 40 minutes during heating operation (the compressor stops).
Anti-condensation prevention control is operating.
When the anti-frost control operates and the compressor
stops during cooling operation.
When high pressure control operates during heating
operation and the compressor stops.
When compressor overheating protective control operates
and the compressor stops.
When refrigeration cycle system protective control
operates.
38
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Occurrence conditions
Auto
Error
recovery
display
-
-
-
-
-
-
(2 times)
-
-
(3 times)
-
-
(2 times)
(2 times)
(2 times)
(2 times)
-
(4 times)
-
-
-
-
-
-
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