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Inverter over-current protective circuit
operates.
(For a short time)
Error on current detection circuit
• Current value is high at AC side even
while compressor stops.
• Phase of power supply is missed.
Coming-off, disconnection or short of
outdoor temp sensor
Coming-off, disconnection or short of
outdoor temp sensor
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
Compressor does not rotate. (Over-current
protective circuit works when constant time
passed after activation of compressor.)
Discharge temp error
• Discharge temp over specified value was
detected.
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.
DC outdoor fan motor error
• IDC operation or lock was detected by
DC outdoor fan driving.
Error on IPDU position detection circuit
Coming-off, disconnection or short of
outdoor temp sensor
Table 10-2-3
Operation of diagnostic function
Judgement and action
Check code Symptom Unit status Condition
All stop
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
Displayed when
error is detected
1. Inverter immediately stops even if restarted.
• Compressor rare short
2. Check IPDU.
• Cabling error
1. Compressor immediately stops even if restarted.
: Check IPDU.
2. Phase-missing operation of power supply
• Check power voltage of R, S, T.
1. Check outdoor temp sensor (TE, TS).
2. Check CDB.
1. Check outdoor temp sensor (TD).
2. Check CDB.
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.
1. Compressor error (Compressor lock, etc.)
: Replace compressor.
2. Cabling trouble of compressor (Phase missing)
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.
1. Overload operation of refrigerating cycle
2. Check outdoor temp sensor (TE).
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.
1. Check outdoor temp sensor (TO).
2. Check P.C. board.