2. System does not cool or heat
LED display
Indoor
Outdoor
Remote
PCB LED
Error
display
(Communi-
No display Power not supplied to
outdoor unit.
Circuit breaker OFF.
Power line faulty.
Voltage across R-S, S-T,
and T-R: 380~415V
Voltage across R-N,S-N,
Normal
display
Outdoor unit system type
selector switch (DIP SW7-1,7-2)
setting error.
Cold air is blown from the indoor
unit during the cooling operation,
but warm air is not blown from
Set to heat recovery type/
cooling only type with cooling/
heating pomp type piping.
Indoor unit refrigerant
system address setting
(SW 7,8) error.
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 indoor unit address
(SW 5) setting error.
(address duplicated)
Installed piping is unsuitable.
piping is too long.
Refrigerant leakage. Check for leaks using a gas
detector.(Refrigerant charged
state)
Regarding air tightness test after
installation or repair,pressurize
the system with nitrogen(3.5MPa)
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
discharge temperature does not
become low when all the indoor
units are operated.
During the heating operation,
the discharge temperature does
not become high when only one
indoor unit is operated.
For light gas insufficiency,
capacity drops only in a specific
operation state.(Note that this
symptom resembles faulty indoor
unit electronic expansion valve
opening.)
– 116 –
Normal
display
Normal
display
Normal after the power reset.
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
Check each outdoor unit power
supply terminal board(Power)
voltage.
and T-N: 220~ 240V.
Outdoor unit is leaking(shorted).
(Circuit to which a voltage is
applied when energized is
leaking electricity.)
Trip the outdoor unit circuit
breaker immediately after setting
the circuit breaker to ON.
The resistance across each
outdoor unit power supply
terminal board(Power)
terminal and outdoor unit
metal part approaches zero.
When shorted,there is a
combination that shows an
outdoor unit power supply
wires(R-S,S-T,T-R,R-N,S-N,T-N)
correlative resistance of nearly
zero.
Outdoor unit is leaking(shorted).
(Circuit to which a voltage is
applied only when operating is
leaking electricity.)
Trip the outdoor unit circuit
breaker during operation.
The resistance value of the
outdoor unit electric parts and
outdoor unit metal part
approaches zero.
When shorted,there is a
combination,which indicates an
electric parts correlative
resistance near zero.
(Real length 100m or more)
Installed piping is unsuitable.
Gas piping diameter is
incorrect.
the indoor unit during the heating
operation.
does not operate.
Operate each indoor unit for 5
minutes or more.
The relevant outdoor unit stops
and starts midway.
(Compressor capacity and heat
exchange capacity at outdoor
unit LED is not correct.)
Multiple indoor units in one
refrigerant system must not be
set to the same indoor unit
address.
Check the outdoor unit and
indoor unit installation site and
estimate the piping length.
When the piping is too long,
the cooling capacity may be
insufficient.
Heating capacity may also be
insufficient,but cooling capacity
is made insufficient.
Check the indoor unit capacity
and piping diameter.
When the gas piping diameter is
large,cooling capacity will be
insufficient.
Heating capacity may also be
insufficient at heating,but cooling
capacity is made insufficient.
outdoor temperature
C,the pressure
changes 5
changes 0.06MPa.)
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