Mitsubishi Electric PURY-80TMU Service Handbook page 96

Checking code Meaning, detecting method
4240 Over load If IDC
protection ously for 10 minutes during opera-
tion of the inverter after 5 or more
seconds have passed since the
inverter started.
4250 IPM alarm 1. IPM/VDC trouble
output /
Bus voltage
abnormality
2. If IDC
ing inverter operation.
3. If VDC
is detected during inverter op-
erates.
103 A is detected continu- 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
7) The wiring is defective.
8) Fan motor (MF) operation is defec-
9) The inverter/compressor is defec-
1) Self protection by IPM break out,
200 A is detected dur- 1) The power supply voltage is abnor-
2) The wiring is defective.
3) The inverter / compressor is defec-
378 V or VDC 190 V (the same as error code 4220)
Cause
defective, or the solenoid valve
drive circuit is defective.
tive.
tive.
(over current, over heat, under con-
trol voltage)
mal.
tive.
–95–
Checking method & Countermeasure
Is the unit's exhaust short cycling?
Clean the heat exchanger.
If the power supply voltage is less than
187 V, it is outside specifications.
If the external air temperature is over 43°C
(109°F) 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 1 connections, 2 contact at the
connectors and 3 for broken wires in
the following wiring.
CNFAN1~MF1
Go to "Treating Fan Motor Related
Trouble."
Go to "Treating Inverter/Compressor
Related Trouble."
Go to the item for error code 4230,
4240.
• Check if an instantaneous power
failure or power failure, etc. has oc-
curred.
• Check if the voltage is the rated volt-
age value.
Check 1, the connections, 2, contact
at the connectors, 3 tightening torque
at screw tightened portions, 4, wiring
polarities, 5, for broken wires, and 6,
for grounding in the following wiring.
* Check if the wiring polarities are as
shown on the wiring diagram plate.
* Check the coil resistances and in-
sulation resistance of the compres-
sor.
Go to "Treatment of Inverter/Compres-
sor Related Trouble."
Go to the item for error code 4220.