1. Troubleshooting procedure (No operation, No heating, No cooling)
Connect U,V,W phase leads to the
power module again and operate the
air conditioner.
Gas leaks.
Repair and seal refr
igerant.
Is the self-diagnosis lamp mode as
shown on the r
ight?
YES
Error (Gas leaking)
Normal
Perform a final check of operation.
When the
self-diagnosis lam
p
lights in the sam
e
condition as above
.
The compressor is defective. Replace it
and seal refrigerant.
If the compressor chec
ker for an
inve
rter type air conditioner is
available, re-check using it.
( )
(JUDGING BETWEEN GAS LEAKAGE AND
COMPRESSOR DEFECTIVE)
Blinking off
Time until the
lamp lights
Approx. 10 seconds
Approx.
10
seconds
Approx.
10
seconds
Within
Appro
x.
30
seconds
Compressor
Compressor
Gas
leakage
Possible
malfunctioning
par
t
LD301
Self-
diagnosis lam
p
Lighting mode
Blinks
2 times
Blinks
3 times
Blinks
4 times
Blinks
5 times
Blinks
6 times
Blinks
8times
Stop to operate and check the gas
pressure in balancing mode
.
Checking the IPM (main P.W.B.)
(R410 A)
The values above are the theoretical ones.
CHECKING THE REFRIGERATING CYCLE
LD303 (red) will light and the unit will operate in the forced cooling mode at this time.
Do not operate for more than 5
minutes
Large dia. service valve
Reducing union
(2/8” and 3/8”)
Copper pipe
(2/8”)
Small diameter
service valve
Re
versing
va
lve
Compressor
Outdoor unit
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