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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
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 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).
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