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Block distinction
Check
code
Block
Outdoor P.C.
board
Not
displayed
Outdoor P.C.
board
Others
(including
compres-
sor)
Operation of diagnosis function
Check
code
Cause of operation
Current-detect circuit
error
Being out of place,
disconnection or short-
circuit of outdoor temp.
sensor (Ts)
Disconnection or short-
circuit of discharge
temp. sensor
Outdoor fan drive
system error
Outdoor temp. sensor
error
Compressor drive
output error, Compres-
sor error (lock, missing,
etc.), Break down
Error exclusive for
multiple type
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 compres-
sor had been acti-
vated.)
Discharge temp.
exceeded 117°C
Break down of
compressor
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 detacted.
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.
Air
conditioner
status
All off
All off
All off
All off
Operation
continues
All off
All off
Operation
continues
All off
All off
All off
Judgment and action
Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.
Check 5-serial LED.
1. Check outdoor temp. 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.
Check 5-serial LED.
When 20 seconds passed after
start-up, position-detect circuit
error occurred. : Replace
compressor.
Check 5-serial LED.
1. Miswiring of connecting wire of
A/B rooms in indoor/outdoor
units
2. Check gas leakage.
3. Check disconnection of sensor.
4. Electronic control valve error
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 compres-
sor (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).