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Block distinction Operation of diagnosis function
Check
code
Block
Check
code
Cause of operation
Air
conditioner
status
Remarks
Judgment and action
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 outdoor temp.
sensor
All off
Displayed when
error is detected.
1. Check outdoor temp. sensors
(TE, TS).
2. Check P.C. board.
Disconnection or short-
circuit of dischar
g
e temp.
sensor
All off Displayed when
error is detected.
1. Check dischar
g
e temp. sensor (TD).
2. Check P.C. board
Outdoor
P.C. board
Outdoor fan drive s
y
stem
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
Outdoor heat exchanger
temp. sensor error
Operation
continues
——
1. Check outdoor heat exchan
g
er temp.
sensor (TE).
2. Check P.C. board.
Outdoor
P.C. board
Compressor drive output
error, Compressor error
(lock, missing, etc.),
Break down
All off Displayed when
error is detected.
When 20 seconds passed after start-
up, position-detect circuit error
occurred. : Replace compressor.
Return serial signal has
been sent when
operation started, but it
is not sent from halfwa
y
.
(1) Compressor thermo.
operation
Gas shortage
Gas leak
(2) Instantaneous power
failure
Operation
continues
Flashes when
trouble is detected
on Return serial
si
g
nal, and normal
status when si
g
nal
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 normall
y
durin
g
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 discha
g
e temp. sensor (TD).
2. Degassing
3. Trouble on P.M.V.
Break down of
compressor
All off Displayed when
error is detected.
1. Check power voltage.
(220–30–40 V+10%)
2. Overload operation of refrigeration
cycle
Check installation condition
(Short-circuit of outdoor diffuser).
Others
(including
compressor)
Four-way valve inverse
error
(TC sensor value
lowered during heating
operation.)
Operation
continues
——
1. Check four-valve operation.