6 Troubleshooting
Outdoor unit
SMGB0135 rev.0 - 06/2020
64
6.1.4 Checking the electrical parts of the outdoor unit
Turn power ON
Is LD301 turned on?
Is there a voltage of 230V AC
between terminal boards L and N?
No No
No
Yes
Yes
Yes
Yes
Yes
Abnormal
Normal
Yes
No
Abnormal
Abnormal
Is the power circuit normal? For details,
see the page on the power circuit.
Check the reversing valve.
Refer to the reversing valve
drive circuit.
If the 15/25 A fuse is blown out, it
may have caused another part to go
out of order. Please take care. (The
main parts which may be in such a
state are the varistor, diode stack,
IPM and smoothing capacitor)
Just in case, turn the power on
once more.
LD301 does nut turn on and the
power circuit is normal.
Reversing
valve normal
Replace the electrical parts of the
outdoor unit.
Replace the outdoor electrical parts (due to
abnormality in the power circuit).
Replace the outdoor electrical parts (due to
abnormality in the power circuit).
Replace the outdoor electrical parts in
the reversing valve drive circuit or the
reversing valve.
Replace the outdoor electrical parts (due
to abnormality in the microcontroller or
the LED).
Check for electrical leakage. After
that, turn on the breaker and make a
double check.
Check the electrical parts of the indoor
unit. (Possibility of failure such as power
relay abnormality or communication error)
Ensure the power supply.
Has the breaker been activated?
Is the 3 A fuse blown out?
Is the 15/25 A fuse normal?
Check the blinking frequency of LD301.
Yes
Yes
Yes
No
No
No
Check that the indoor timer lamp
blinks.
Abnormal
Normal
Normal
Blinks 3 times
Blinks 12 times
Check the indoor electrical
parts. (Check the temperature
fuse in the terminal board)
Fix the connection of the F
cable
Replace the outdoor electrical
parts (due to abnormality in the
microcontroller or the EEPROM).
Release JW001 and JW002
Replace the outdoor electrical
parts (due to abnormality in the
communication circuit)
Replace the outdoor electrical parts
(in the case of an abnormality in the
communication circuit).
Fix the point of failure
Is JW001 open? Or is the circuit
between JW001 and JW002 short?
JW001 is open or JW001 and JW002 are short
Identify the point of failure
Abnormality in equipment other than the electrical parts
Abnormality other than compressor
stoppage
LD301 blinks 13 times.
LD301 blinks once.
Start operation with the remote control or the
pump down option in the indoor.
Check the F cable connection (for incomplete insertion,
connection with a too thin cable, erroneous connection
between terminal boards 1, 2 and 3, and other abnormalities).
LD301 is lit on while heating operation is being performed. LD301 is turned on for 2 seconds and o
for 0.3 seconds when the unit is operating with a heavy load (But this is not a sign of failure). If LD301
blinks in 0.25 second intervals, please refer to the following checks after operation.
If LD301 blinks in 0.25 second intervals, count
the times between 2 second o intervals.
Reset stop
LD301 blinks 9 times.
EEPROM reading error
Communication error
Compressor stoppage
LD301 blinks once.
Reset stop
Yes
No
If the indoor unit is either of the following
states,it will blink once.
• Ionmist in progress
• 2 hours before the ON timer
Turn the power back on, start
operation with the remote control
or the pump down option in the
indoor, and check the blinking
frequency of the LD301.
Blinking once
Other
Replace the outdoor electrical parts
(in the case of an abnormality in the
reset circuit or microcomputer).
LD301 blinks 9 times.
Communication error
Yes
No
Conduct a check according to the
description of the LED blinking 9
times given above.
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