– 171 –
LD301
b
links 6 times
.
The temperature at the
OH ther
mistor
rises
.
Is the ther
mistor circuit
nor
mal?
Replace par
ts in the
ther
mistor circuit.
LD301
b
links 5 times
.
Ov
er
load lo
wer limit cut.
Replace the main P
.W
.B
.
*Chec
k
to see if the refr
igerating cycle is def
ectiv
e
.
*Chec
k
the indoor unit f
or clogged heat e
xchanger or filter
.
*Chec
k
the outdoor unit f
or def
ectiv
e
shielding.
LD301
b
links 4 times
.
F
ailure of s
witching.
Is the 15V po
wer supply
output nor
mal?
(P
o
w
er
P
.W
.B
. displa
y
)
Is the intelligent po
w
e
r
module (IPM) nor
mal?
(In
v
er
ter section)
The intelligent po
wer module
ma
y be def
ectiv
e
.
Replace the main P
.W
.B
.
* See
“System
P
o
wer
Module Diagnosis”.
With CN3 and CN4
disconnected, is the 15V
output between
“15V”
and
”15-0V”
on the po
wer
P.
W
.B
.?
Replace the po
w
er
P
.W
.B
.
LD301
b
links 3 times
.
Abnor
mal lo
w speed.
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Yes
No
No
No
No
No
No
No
•
