Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 1074 / 1106

1072
FDC-HKXR
Error
Power supply check
(indoor/outdoor unit)
Replacement or repair of defective
parts Test run/adjustment
Check of unit
controller
Check of inspection display [In-
door/outdoor unit PCB, remote
controller or Indication board]
Check of inspection display [In-
door/outdoor unit PCB, remote
controller or Indication board]
Power supply reset
(1)
(2) Procedures of trouble diagnosis
d) Recording and reset of error
• Outdoor unit side
52C secondary side L3-phase wiring is open.
Discharge temperature abnormality
Broken wire of heat exchanger thermister
Broken wire of outdoor temperature
thermister
Broken wire of discharge thermister
Hight pressure cut
Power transistor overheat
Current cut
Excessive number of outdoor units
Transmission error between inverter and
outdoor unit PCB
Error code Timing of error detection
An abnormal stop occurs when the L3-phase voltage is 0 V for 5 seconds running.
(Detected with 52C ON only)
A stop occurs when this abnormality occurs for 2 seconds running at 130
°
C
After a stop for 3 minutes, an recovery is automatically made.
An abnormal stop occurs when this abnormality occurs twice for 60 minutes.
(The abnormal state is held for 45 minutes.)
This failure is detected when it occurs for 5 seconds running in the period of 2
minutes to 2 minutes and 20 seconds with the compressor ON. An abnormal stop
occurs when this failure occurs 3 times for 40 minutes.
This failure is detected when it occurs for 5 seconds running in the period of 10
minutes to 10 minutes and 20 seconds with the compressor ON. An abnormal stop
occurs when this failure occurs 3 times for 40 minutes.
An abnormal stop occurs when this abnormality occurs 2 times for 40 minutes.
A stop occurs at 90
°
C or more. After 3 minutes, a recovery was automatically
made at 83
°
C or less. Abnormal stop occurs when this abnormality occurs 2 times
for 2 hours.
An abnormal stop occurs when this abnormality occurs 4 times for 15 minutes.
This error is detected when the number of connectable units is set over the
specified value at remote control addressing.
When an transmission error continues for 10 seconds, the 52C is turned off. With
a delay of 3 minutes, a recovery is automatically made. An abnormal stop occurs
when this error occurs 4 times for 15 minutes.
Error detail
Error code
Indoor unit inspection
lamp (red)
Outdoor unit inspection
lamp (red)
Memory
• Saves in memory the mode (1) of
higher priority
• Cannot save in memory
• Saves in memory the mode (1) of
higher priority
Reset
• Stop the unit operation by pressing the ON/OFF switch of
remote controller.
• Operation can be started again if the error has been reset.
(2)
Error display
Notes (1) Priority is in the order of E1 > ... > E10 > ... > 45.
(2) Reset is disabled for 45 min. at the error of outdoor unit or compressor overcurrent or the discharge gas temperature
error.
Note (1) It means the operation to turn off the power and back on again more than 1 min. later in order to reset the
malfunction of microcomputer due to the effect of power supply conditions or accidental noise.
e) Reset of error code in memory (when the error has been reset.)
Indoor unit: Press the Timer switch and the Stop switch while the Inspection switch of wired remote controller is held
down or detach the power supply connector (CnW
2
) of indoor unit PCB and connect again or turn OFF the power.
Outdoor unit: Detach the power supply connector (CNA
2
) of outdoor unit PCB and connect again or turn OFF the power
supply or turn on and off the SW3-1.
When any error occurs, inspect in following sequence. Detailed explanation on each step is given later in this text.