Checking The Electrical Parts Of The Outdoor Unit - Hitachi YUTAMPO Series Service Manual

6 Troubleshooting
Outdoor unit

6.1.4 Checking the electrical parts of the outdoor unit

Turn power ON
No
Is there a voltage of 230V AC
Is LD301 turned on?
between terminal boards L and N?
Yes
Is the 15/25 A fuse normal?
Is the power circuit normal? For details,
see the page on the power circuit.
Check the blinking frequency of LD301.
Yes
LD301 blinks 13 times.
EEPROM reading error
No
Yes
LD301 blinks 9 times.
Communication error
No
No
LD301 blinks once.
Reset stop
Yes
Start operation with the remote control or the
pump down option in the indoor.
Compressor stoppage
If LD301 blinks in 0.25 second intervals, count
the times between 2 second off intervals.
Yes
LD301 blinks once.
Reset stop
No
Yes
LD301 blinks 9 times.
Communication error
No
64 SMGB0135 rev.0 - 06/2020
No
Yes
Abnormal
Yes
Abnormal
Yes
Just in case, turn the power on
once more.
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).
Normal
Blinks 3 times
Check that the indoor timer lamp
blinks.
Blinks 12 times
JW001 is open or JW001 and JW002 are short
Is JW001 open? Or is the circuit
between JW001 and JW002 short?
Normal
LD301 is lit on while heating operation is being performed. LD301 is turned on for 2 seconds and off
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.
Abnormality other than compressor
stoppage
Identify the point of failure
Abnormality in equipment other than the electrical parts
If the indoor unit is either of the following
states,it will blink once.
• Ionmist in progress
• 2 hours before the ON timer
Ensure the power supply.
Normal
Yes
Has the breaker been activated?
No
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)
No
Is the 3 A fuse blown out?
Yes
Reversing
valve normal
Check the reversing valve.
Refer to the reversing valve
drive circuit.
Abnormal
LD301 does nut turn on and the
power circuit is normal.
Abnormal
Turn the power back on, start
operation with the remote control Blinking once
or the pump down option in the
indoor, and check the blinking
frequency of the LD301.
Other
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)
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).
Replace the outdoor electrical
parts (due to abnormality in the
microcontroller or the EEPROM).
Fix the connection of the F
cable
Check the indoor electrical
parts. (Check the temperature
fuse in the terminal board)
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
Replace the outdoor electrical parts
(in the case of an abnormality in the
reset circuit or microcomputer).
Conduct a check according to the
description of the LED blinking 9
times given above.