Block distinction
Operation of diagnosis function
Check
code
Block
Check
code
Cause of operation
Air
conditioner
status
Display flashing
error
Compressor drive output error.
All OFF
Flashes after
1. Check installation conditions such as
(Relation of voltage, current
error is detected
packed valve opening, refrigerant
and frequency is abnormal)
8
times*.
amount and power supply (rate +10%,
Overloading operation of
both of operation and non operation
compressor caused by
condition).
over-charge refrigerant,
2. Check P.M.V. by measure the
P.M.V. failure, etc.
resistance of the coil and confirm its
Compressor failure (High
operation (sound of initial
current).
operation, etc.)
3. Observe any possibility cause which
may affect operation load of
compressor.
4. Operate again. If compressor
operation is failure when 20 seconds
passed (count time from operation
starting of compressor), replace
compressor.
*
4
or 8
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
or 8
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
Return signal of the outdoor
Indoor unit
Flashes when
1. Check power supply (Rate + 10%)
(including
unit has been sent when
operates
error is detected. 2. If the air conditioner repeat operates
compressor)
operation start. But after
continue.
Flashing stop
and stop with interval of approx. 10
that, signal is stop some time.
Outdoor unit
and outdoor unit
to 40 minutes.
Instantaneous power
stop.
start to operate
Check protector (hardware) such
failure.
when the return
as Hi-Pressure switch,
Some protector
signal from the
Thermal-Relay, etc.
(hardware) of the
outdoor unit is
Check refrigerant amount, packed
outdoor unit open
normal.
valve opening and any possibility
circuit of signal.
cause which may affect high
Signal circuit of indoor
temperature or high pressure.
P.C. board or outdoor
3. Check operation signal of the indoor
P.C. board is failure
unit by using diode. Measure voltage
in some period.
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.
Action and Judgment
- 91 -
Outdoor P.C.
board
