Omega WM 09K Service Manual page 53

11.4.3 E0,E5 Error
Start
Display E0
Shut off power and supply
again and
observe 10 Mins
Display E0
Not OK
Check the wire
connections
OK
Check the terminal
L and N voltage
Yes
If the voltage is
0 V
No
Check the terminal
N and 1 voltage
Yes
If the voltage
change occurs
between 0~24V
If the voltage change
occurs between
0~12V not 13~24V
If the voltage no change
Replace indoor PCB, if
unsolved replace power
supply board or outdoor
PCB assembly
Air Conditioner Service Manual
Replace inverter board and power
Display E5
supply board or outdoor PCB
assembly
Display E5
Connects the
wire again
Replace indoor
PCB
Replace indoor
PCB
Replace power supply
Yes
board or outdoor PCB
assembly
Display E5
Shut off power
and supply again
Display E0 first and then
display E5 and keep
If the indicator on the
outdoor PCB blink?
No
Check terminal L&N
voltage
Normal
Check the rectifier
bridge, fast recovery
diode (FRD) and IGBT
Normal
Test the DC voltage
between DC+ and DC-
If the voltage is
approx. zero
Replace PFC board
or outdoor PCB
assembly
If the problem cannot be solved
by using the methods above
Replace the indoor main PCB,
power source board, and PFC
board or outdoor PCB assembly
Replace inverter board
Yes
Solve as E0
Abnormal
Check wire connected
and replace indoor PCB
Damage
Replace PFC board or
outdoor PCB assembly
If the voltage is
approx. 300V
Replace power supply
board or outdoor PCB
assembly
45