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Operation of diagnostic function
Check
code
Cause of operation
Inverter over-current protective
circuit operates.
(For a short time)
Status of air
conditioner
All stop
Condition
Displayed when
error is detected
Judgment and measures
1. Inverter immediately stops even if restarted.
• Compressor rare short
2. Check IPDU.
• Cabling error
Error mode detected by outdoor unit
All stop
All stop
All stop
All stop
All stop
All stop
All stop
All stop
All stop
All stop
Operation
continues
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
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Error on current detection
circuit
• Current value is high at AC
side even while compressor
stops.
• Phase of power supply is
missed.
1. Compressor immediately stops even if restarted.
: Check IPDU.
2. Phase-missing operation of power supply
• Check power voltage of R, S, T.
Coming-off, disconnection or
short of outdoor temp sensor
1. Check outdoor temp sensor (TE, TS).
2. Check CDB.
Coming-off, disconnection or
short of outdoor temp sensor
1. Check outdoor temp sensor (TD).
2. Check CDB.
Compressor drive output error
• Tin thermistor temp, Tin error
(IPDU heat sink temp. is high.)
Communication error between
IPDU
• Connector coming-off
between CDB and IPDU
1. Abnormal overload operation of refrigerating cycle
2. Loosening of screws and contact error of IPDU and
heat sink
3. Cooling error of heat sink
4. Check cabling of CDB and IPDU.
Compressor does not rotate.
(Over-current protective circuit
works when constant time
passed after activation of
compressor.)
1. Compressor error (Compressor lock, etc.)
: Replace compressor.
2. Cabling trouble of compressor (Phase missing)
Discharge temp error
• Discharge temp over
specified value was detected.
1. Check refrigerating cycle. (Gas leak)
2. Error of electron control valve
3. Check pipe sensor (TD).
1. Check power voltage. (AC200V±20V)
2. Overload operation of refrigerating cycle
3. Check current detection circuit at AC side.
Compressor breakdown
• Operation frequency lowered
and stops though operation
had started.
High-voltage protection error
by TE sensor
• TE temp over specified value
was detected.
1. Overload operation of refrigerating cycle
2. Check outdoor temp sensor (TE).
DC outdoor fan motor error
• IDC operation or lock was
detected by DC outdoor fan
driving.
1. Position detection error
2. Over-current protection circuit operation of outdoor fan
drive unit
• Check CDB.
• Refer to Judgment of outdoor fan.
1. Position detection circuit operates even if driving by
removing 3P connector of compressor.
• Replace IPDU.
Error on IPDU position
detection circuit
1. Check outdoor temp sensor (TO).
2. Check P.C. board.
Coming-off, disconnection or
short of outdoor temp sensor