Filter
Top Products
– 74 –
Block distinction
Check
code
Block
Outdoor P.C.
board
Not
displayed
Outdoor P.C.
board
Others
(including
compressor)
Operation of diagnosis function
Check
code
Cause of operation
Inverter over-current
protective circuit
operates. (Short time)
Position-detect circuit
error or short-circuit
between windings of
compressor
Current-detect circuit
error
Being out of place,
disconnection or short-
circuit of the outdoor
heat exchanger sensor
(TE) or suction temp.
sensor (Ts)
Disconnection or short-
circuit of discharge temp.
sensor
Outdoor fan drive system
error
Being out of place,
disconnection or short-
circuit of the outdoor
temp. sensor (TO)
Compressor drive output
error, Compressor error
(lock, missing, etc.),
Break down
Return serial signal has
been sent when
operation started, but it
is not sent from halfway.
1) Compressor thermo.
operation
Gas shortage
Gas leak
2) Instantaneous power
failure
Compressor does not
rotate.
(Current protective
circuit does not operate
when a specified time
passed after compressor
had been activated.)
Discharge temp.
exceeded 117°C
Break down of
compressor
4-way valve inverse error
(TC sensor value
lowered during heating
operation.)
Air
conditioner
status
All off
All off
All off
All off
All off
All off
Operation
continues
All off
Operation
continues
All off
All off
All off
Operation
continues
Remarks
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
——
Displayed when
error is detected.
Flashes when
trouble is detected
on return serial
signal, and normal
status when signal
is reset.
Displayed when
error is detected.
Displayed when
error is detected.
Displayed when
error is detected.
——
Judgment and action
Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.
1. Even if connecting lead wire of
compressor is removed, position-
detect circuit error occurred. :
Replace P.C. board.
2. Measure resistance between
wires of compressor, and
perform short-circuit. :
Replace compressor.
Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.
1. Check sensors (TE, TS).
2. Check P.C. board.
1. Check discharge temp. sensor
(TD).
2. Check P.C. board
Position-detect error, over-current
protective operation of outdoor fan
drive system, fan lock, etc. :
Replace P.C. board or fan motor.
1. Check outdoor temp. sensor
(TO).
2. Check P.C. board.
When 20 seconds passed after
start-up, position-detect circuit error
occurred. : Replace compressor.
Trouble on P.M.V.
1. Repeat Start and Stop with
interval of approx. 10 to 40
minutes. (Code is not displayed
during operation.)
Supply gas.
(Check also gas leak).
2. Unit operates normally during
check.
If return serial signal does not
stop between indoor terminal
block 2 and 3, replace inverter
P.C. board.
If signal stops between indoor
terminal block 2 and 3, replace
indoor P.C. board.
1. Trouble on compressor
2. Trouble on wiring of compressor
(Missed phase)
1. Check dischage temp. sensor
(TD).
2. Gas leakage
3. Trouble on P.M.V.
1. Check power voltage.
(220–230–240 V +10%)
2. Overload operation of refrigera-
tion cycle
Check installation condition
(Short-circuit of outdoor diffuser).
1. Check 4-way valve operation.