Error
display
(Communi-
No display Power is not supplied to
outdoor unit.
Circuit breaker is at OFF position.
Power line is faulty.
Voltages between R-S, S-T,
and T-R are 380~415V
Voltages between R-N, S-N,
Normal
display
Indoor unit refrigerant
system address (SW 8,9) setting
is incorrect.
When the indoor units are
operated one by one,there is an
indoor unit whose outdoor unit
Set the address to the same
refrigerant system address of the
outdoor unit to which the
refrigerant piping is connected.
Indoor unit address
(SW 6) setting is incorrect.
(address duplicated)
Installed piping is unsuitable.
pipe length is too long.
Refrigerant leakage. Check refrigerant leakage using
a gas detector.(Refrigerant
charged state)
Regarding air tightness test after
installation or repair,pressurize
the system with nitrogen(2.94MPa)
and test for leaks with soapy
water and allow the system to
stand for 24 hours,and then
check that there is no drop in
pressure.(Note: When the
Insufficient gas (light) During the cooling operation,the
air flow temperature does not
become low when all the indoor
units are operating.
During the heating operation,
the air flow temperature does
not become high when only one
indoor unit is operating.
For light gas insufficiency,
capacity drops only in a specific
operation state.(Note that this
symptom resembles faulty
caused by a bad opening of
indoor unit's electronic
expansion valve.)
Norma
ldisplay
Normal
display
LCD
Body
LED
Symptom that
can occur other
than title
Check method
(Error state check method)
Remarks
cation error)
Error
display
(Communi-
cation error)
Cause
and T-N are 220~ 240V.
The resistance value of the
outdoor unit electric parts and
outdoor unit metal part
approaches zero.
(Actual length exceeds 100m)
Installed piping is unsuitable.
Gas pipe diameter is
incorrect.
does not operate.
Operate each indoor unit for 5
minutes or more.
The relevant outdoor unit stops
and operates unsteadily.
(Compressor capacity and heat
exchange capacity is incorrect
by observing the LED of PCB
of outdoor unit.)
Multiple indoor units in one
refrigerant system must not be
set to the same indoor unit
address.
Check the position of outdoor
and indoor units and estimate
the piping length.
When the pipe length is too long,
the cooling and heating capacity
insufficient.
Check the indoor unit capacity
and pipe diameter.
When the gas pipe diameter is
large,cooling and heating capacity
will be insufficient.
outdoor temperature
C,the test pressure
changes 5
changes 0.05MPa.)
may be
05-38
Become normal after the power
is reset.
Outdoor unit is short circuiting.
(The circuit to which voltage is
applied when operation is short
circuiting (leakage of electricity).)
Outdoor unit is short circuiting.
(The circuit to which voltage is
applied when operation is short
circuiting (leakage of electricity).)
Check the voltage of power sup-
ply terminal board of outdoor unit.
The breaker falls immediately
after turning on the breaker of
the outdoor units. The resistance
between the power terminal block
and the metal parts of outdoor
units is almost zero.
The outdoor unit circuit
breaker trips during operation.
When short circuit occurred,the
resistances between power sup-
ply terminals (R-S, S-T, T-R, R-N,
S-N, T-N) of outdoor unit
approach to zero.
If short circuited,there is a elec-
tric part whose resistance
between two electrodes will
indicate a value near zero.
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