– 96 –
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 shortcircuit 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 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.
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
specified 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 discharge temp. sensor (TD).
2. Gas leakage
3. Trouble on PMV.
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 (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.