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104
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'20 • KX-T-373
E42
E42
Current cut (2)
Stays Off
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
Is the
checked result of
power transistor
module OK?
• Is the installation space of indoor and/or outdoor unit enough?
• Is there any short-circuit of air on indoor and/or outdoor unit?
• At cooling, does the outdoor fan motor run?
Is the filter clogged?
• At heating, does the indoor fan motor run?
Is the filter clogged?
• Is there any liquid flooding?
Is the superheat within normal range?
Is the low pressure sensor and suction pipe temperature normal?
• Is there any anomalous sound on the compressor?
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NO
After
resetting power
for several times does it
become normal?
NO
Temporary noise may cause
of anomaly.
If noise source can be found,
take countermeasure.
Replace inverter PCB.
Replace compressor.
2. Error detection method
In order to prevent from
over current of inverter,
if the current exceeds the
compressor stopping.
3
.
Condition of error displayed
If the output current of inverter
Makes the compressor stopping.
After 3-minutes dealY, The
Compressor restarts, but if
This anomaly occurs 4 times
within 30 minutes after the initial
detection.
4. Presumable cause
• Open the valves
• Faulty power source
• Insufficient refrigerant amount
• Faulty compressor
• Faulty power transistor
module
Note: 1. Between "TP_15V_+" and "TP_GND2" on the control PCB is the test point.
2. C541 on the inverter PCB is the test point.
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
YES
YES
YES
Is DC15V
output OK?
(Refer to note 1)
YES
YES
Is DC15V
output OK?
(Refer to note 2)
NO
NO
Replace control PCB.
Replace inverter PCB.
Single phase model Three phase model
*Check during
unit operating
*Check during
unit operating
NO
Fix them.
E43
E43
Excessive number of indoor units
connected, excessive total capacity of connection,
communication error from outdoor unit to indoor unit
Stays Off
Stays Off*1
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
Is E43 dispalyed?
Are there
any indoor units which
is not expected to exsist in
this signal
line?
Save data for 30 minutes before stopping in Mente PC.
NO
Does
the number of
indoor units connected
and/or total capacity
exceed limitation?
Check the resistance
between A and B of signal
line as well.
Check the connected number
of indoor units with 7-segment
display code 40 or Mente PC
with reference to the utilities
drawing. (Check not only one
system, but also other systems.)
YES
YES
General checking of indoor/outdoor unit addresses by means of:
Outdoor unit: Mente PC, 7-Segemnt display C40 and
rotary switch (SW1, 2)
Indoor unit: Remote control, rotary switch
(SW1, 2, 3, 4) and SW5-2
* It is recommended to use means other than the rotary switch,
which could be defective.
Reset the power source.
Check and save the data of
operating condition.
Test run
No action is taken because
it is judged that the power
reset was not done after
changing address.
Check indoor unit
addresses and correct.
In order to operate the
unit tentatively, even if
total capacity of connected
indoor units exceeds 150%
of outdoor unit capacity,
turn ON the dip switch
SW5-4 on outdoor unit
control PCB.
(However since this
tentative solution could
cause trouble, be sure
to correct it as soon as
possible)
Signal wire may be
connected to other systems.
Separate the signal wire.
Correct addresses.
(Either one of addresses is
wrong.)
If the address corrected
with rotary switch is still
wrong, replace control PCB
(Defective rotary switch)
* Before replacement,
the rotary switch for
address setting is not
damaged. (It was
experienced that No. 5
on rotary switch was not
recognized.)
2. Error detection method
When the number of connected
indoor units exceeds the
limitation.
When the total capacity of
connected indoor units exceeds
the limitation.
(When the total capacity of
connected indoor units exceeds
150% of outdoor unit capacity)
3
.
Condition of error displayed
• Excessive number of
connected indoor units
• Excessive total capacity of
connected indoor units
• The total capacity of
connected indoor units
exceeds 150% of outdoor unit
capacity
4. Presumable cause
• Mistake in setting of indoor/
outdoor unit addresses
• Mistake in signal wire
connection
Note:
Caution:
unless the power is reset after
changing addess.
Error code
Remote control:
7-segment display:
3 time flash : Communication error from outdoor unit to indoor unit
2 times flash : Excessive total capacity of connection,
LED Green Red
Indoor
Outdoor
Content
YES
NO
NO
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