Mitsubishi City Multi PURY-P400 Service Handbook page 115

Checking code Meaning, detecting method
4240 Over load IAC
protection ously for 10 minutes during opera-
tion of the inverter after 5 or more
seconds have passed since the in-
verter started.
1 Over current, overheat or
4250 IPM alarm
output / undervoltage of drive cirduit is
Bus voltage detected by IPM during inverter
abnormality operation.
[Inverter error detail : 1]
2 VDC
detected during inverter opera-
tion.
[Inverter error detail : 1]
3 IAC
ing inverter operation.
[Inverter error detail : 11]
32 Arms is detected continu-
300 or VDC 760V is
39Arms is detected dur-
Cause
1) Air passage short cycle.
2) The heat exchanger is clogged.
3) Power supply voltage.
4) External air temperature.
5) Capacity setting error.
6) The solenoid valves (SV1, 2) are
defective, or the solenoid valve
drive circuit is defective.
7) The wiring is defective.
8) Fan motor (MF) malfunction.
9) The inverter/compressor is defec-
tive.
1) The power supply voltage is abnor-
mal.
2) Faulty wiring.
3) The inverter / compressor is defec-
tive.
–114–
Checking method & Countermeasure
Is the unit's exhaust short cycling?
Clean the heat exchanger.
If the power supply voltage is less than
342 V, it is outside specifications.
If the external air temperature is over
43°C, it is outside the specifications.
• Is the indoor unit capacity total cor-
rect?
• Are the outdoor/indoor unit capac-
ity settings correct?
To judge failure of the solenoid valve,
go to "Individual Parts Failure Judg-
ment Methods" for the "Solenoid Valve."
Check the following items: 1) connections,
2) contact at the connectors, and 3) for
broken wires in the following wiring.
TB1A~NF~TB1B
TB1B~FANCON board~CN04
CNMF~MF
TB1B~CNTR1
CNFC1~CNFC2
Go to "Treating Fan Motor Related
Trouble."
Go to "Treating Inverter/Compressor
Related Trouble."
• Check if an instantaneous stop or
power failure, etc. has occurred.
• Check if the voltage is within the
rated voltage range.
Check the following items: 1) connec-
tions, 2) contact at the connectors, 3)
tightening torque of the screws, 4) wir-
ing polarities, 5) for broken wires, and
6) for grounding for the following wiring.
TB1A~NF~TB1B, TB1A~DS~[52C,
R1, R5]~[C2, C3]~IPM Wiring
CNDC1 (G / A) ~ CNVDC (INV) Wir-
ing
* Check if the wiring polarities are as
shown on the wiring diagram plate.
Go to "Treatment of Inverter/Compres-
sor Related Trouble."