Block distinction
Operation of diagnosis function
Check
code
Block
Check
code
Cause of operation
Air
conditioner
status
Display
flashing error
Action and Judgment
Indoor unit Flashes when 1.. Check power supply (Ra
te
+10%)
operates error is detected 2.
continue.
Flashing stop
Return signal of the outdoor
unit has been sent when
operation start. But after
that, signal is stop some time.
Outdoor unit
and outdoor unit
stop.
start to operate
when the return
signal from the
outdoor unit is
normal.
. If the air conditioner repeat operat
and stop with interval of approx. 10
to
40 minutes.
(In case of
these
exist)
Check protector (hardware) such
as
Hi-Pressure switch,
T
hermal-Relay,
etc.
Check refrigerant amount, packed
valve opening and any
possibility
cause which may affect high
temperature or high pressure.
3.
Check operation signal of the indo
or
unit
by using diode. Measure voltage
at
terminal block of the indoor unit
between No.2 and No.3 (or L2 and S)
If signal is varied 15-60V continuously,
replace inverter P.C. board.
If signal is not varied, replace indoor
P.
C. board.
4.
Check and clean heat exchanger
area
Indoor and Outdoor unit
.
Instantaneous power
failure.
Some protecto
r
(hardware) of the
outdoor unit open
circuit
of signal.
Signal circuit of indoor
P.C. board or outdoor
P.C. board is failure
in
some period.
TE, TC
high tmperature
TE for cooling operation
TC for heating operation.
11 times*.
*
4
, 8
or
11
times ; When first error is detected, error is count as 1 time, then once operation is stop and re-started.
After re-starting operation within 6 minutes, if same error is detected, error count is add (count become 2
times) When error count comes 4, 8, 11 or 18 times, record error to check code. But after re-starting operation,
if no error is detected and air conditioner can operate more than 6 minutes, error count is cleared.
The others
(including
compressor)
(TE only exists in
the Heat Pump system)
5.
Check sensors, TE, TS connection.
In
case of sensors and it’s connection
is
normal, check the inverter P
.
C
.
board
.
6.
Check 4way valve operation/position.
In case TE, TS detected temperature
relationship are different from normal
operation, “18” might be detected.
TE or TS sensor; abnormal.
Out of place, disconnection,
shortage, or misconnection
(TE sensor is connected to
TS connector, TS sensor is
connected to TE sensor
connector)
TE sensor; Outdoor heat
exchanger temperature
sensor
TS sensor; Suction pipe
temperature sensor
FILE NO. SVM-18048
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