Failure Diagnosis For Inverter System; Points Of Diagnosis - Panasonic Urban Multi MX1R Series Service Manual

Failure Diagnosis for Inverter System

4.

Failure Diagnosis for Inverter System

4.1

Points of Diagnosis

The main causes for each malfunction code are given in the table below. (For details refer to the next page
and those following.)
• : Failure is probable
{ : Failure is possible
... : Failure is improbable
— : Failure is impossible
Malfunction
192
Contents of Inverter
code malfunction
PC board
power unit
L4 Radiator fin
...
temperature
rise
L5 Instantaneous
{
over-current
L8 Electronic
...
thermostat
L9 Stall
...
prevention
LC Malfunction of
transmission
between
{
inverter PC
board and
outdoor unit
PC board
U2 Abnormal
current/
{
voltage
P1 Over-ripple
protection
{
P4 Defect of
radiator fin
{
temperature
sensor
Location of failure
Compressor Refrigerant
system
Other
•
— —
• ...
—
• {
—
{ •
—
•
— —
{
— —
{
— —
...
— —
Troubleshooting Urban Multi "MX1, ME1 Series" Using R-22
PACD011001C2
Outdoor Other Field
Point of diagnosis
unit PC cause
board
Is the intake port of
...
— —
the radiator fin
clogged?
Inspect the
— — —
compressor.
Inspection the
— — —
compressor and
refrigerant system.
Inspection the
— — —
compressor and
refrigerant system.
Inspect the
connection between
the inverter PC
...
— —
board and outdoor
unit PC board.
Next, inspect the
inverter PC board.
• Inspect the fuse
on the inverter PC
... •
—
board.
• Check the DC
voltage.
• Open phase
• Current/voltage
{
— —
imbalance
• Defect of main
circuit wiring
Inspect the radiator
fin thermistor.
— — —