– 98 –
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
• Disconnection or short-
circuit of the gas side
sensor (TG).
• Communication error
between MCUs on
outdoor P.C. board.
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.)
P.M.V. error
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
All off
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.
——
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.
Check 6-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.
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 PMV.
1. Check power voltage.
(220–230–240 V +10%)
2. Overload operation of refrigeration
cycle
Check installation condition
(Short-circuit of outdoor diffuser).
1. Check 4-way valve operation.
1. Check LED (D800–D805) 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.
