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Block distinction Operation of diagnosis function
Judgment and action
Check
code
Block
Check
code
Cause of operation
Air
conditioner
status
Remarks
Outdoor
P.C. board
Inverter over-current
protective circuit
operates. (Short time)
All off Displayed when
error is detected.
Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.
Position-detect circuit
error or short-circuit
between windings of
compressor
All off Displayed when
error is detected.
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.
Current-detect circuit
error
All off Displayed when
error is detected.
Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.
Being out of place,
disconnection or short-
circuit of the outdoor
heat exchanger sensor
(TE) or suction temp.
sensor (TS)
All off Displayed when
error is detected.
1. Check sensors (TE, TS).
2. Check P.C. board.
Disconnection or short-
circuit of discharge
temp. sensor
All off Displayed when
error is detected.
1. Check discharge temp. sensor (TD).
2. Check P.C. board.
Outdoor fan drive
system error
All off Displayed when
error is detected.
Position-detect error, over-current
protective operation of outdoor fan drive
system, fan lock, etc. :
Replace P.C. board or fan motor.
Not
displayed
Being out of place,
disconnection or short-
circuit of the outdoor
temp. sensor (TO)
Operation
continues.
—
1. Check outdoor temp. sensor (TO).
2. Check P.C. board.
Outdoor
P.C. board
Compressor drive output
error, Compressor error
(lock, missing, etc.).
Break down
Disconnection or
short-circuit of the
gas side sensor (TG).
Communication error
between MCUs on
outdoor P.C. board.
•
•
All off Displayed when
error is detected.
Check 5-serial LED.
When 20 seconds passed after start-up,
position-detect circuit error occurred. :
Replace compressor. Trouble on P.M.V.
Check gas side temp. sensor (TG).
Check P.C. board.
Check communication wire between
outdoor P.C. board.
Check outdoor P.C. board.
•
•
•
•
Others
(including
compressor)
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
Operation
continues.
Flashes when
trouble is detected
on return serial
signal, and normal
status when signal
is reset.
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.
Compressor does
not rotate. (Current
protective circuit does
not operate when a
specifi ed time passed
after compressor had
been activated.)
All off Displayed when
error is detected.
1. Trouble on compressor
2. Trouble on wiring of compressor
(Missed phase)
Discharge temp.
exceeded 117°C
All off Displayed when
error is detected.
1. Check dischage temp. sensor (TD).
2. Gas leakage
3. Trouble on P.M.V.
Break down of
compressor
All off Displayed when
error is detected.
1. Check power voltage.
(220–230–240 V +10%)
2. Overload operation of refrigeration cycle
Check installation condition
(Short-circuit of outdoor diffuser).
4-way valve inverse
error (TC sensor value
lowered during heating
operation.)
Operation
continues.
—
1. Check 4-way valve operation.
P.M.V. error All off Displayed when
error is detected.
1. Check LED (D09–D13) on inverter
P.C. board.
2. Check connection of P.M.V. wiring.
3. Start operation. (Excluding error room)
4. If the same error is occurred.Replace
P.M.V.
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