13
TROUBLESHOOTING
A
VOID
CONTACT
WITH
THE
CHARGED
AREA
.
•N
EVER
TOUCH
THE
CHARGED
AREA
BEFORE
CONFIRMING
THAT
THE
RESIDUAL
VOLTAGE
IS
50
VOLTS
OR
LESS
.
1. S
HUT
DOWN
THE
POWER
AND
LEAVE
THE
CONTROL
BOX
FOR
10
MINUTES
.
2. M
AKE
SURE
TO
TOUCH
THE
E
ARTH
GROUND
TERMINAL
TO
RELEASE
THE
STATIC
ELECTRICITY
FROM
YOUR
BODY
(
TO
PREVENT
FAILURE
OF
THE
PC
BOARD
).
3. M
EASURE
THE
RESIDUAL
VOLTAGE
IN
THE
SPECIFIED
MEASUREMENT
POSITION
USING
A
VOM
WHILE
PAYING
ATTENTION
NOT
TO
TOUCH
THE
CHARGED
AREA
.
4. I
MMEDIATELY
AFTER
MEASURING
THE
RESIDUAL
VOLTAGE
,
DISCONNECT
THE
CONNECTORS
OF
THE
OUTDOOR
UNIT
’
S
FAN
MOTOR
. (I
F
THE
FAN
BLADE
ROTATES
BY
STRONG
WIND
BLOWING
AGAINST
IT
,
THE
CAPACITOR
WILL BE CHARGED,
CAUSING
THE
DANGER
OF
ELECTRICAL
SHOCK
.)
WARNING
POSSIBLE CAUSE
X IN ANALYSIS GUIDE INDICATE
"POSSIBLE CAUSE"
Com
p di
sc
har
ge
te
m
p >
200F
Com
p di
sc
har
ge
te
m
p <
105F
Com
p
di
sc
har
ge S
H
>
70F
Com
p
di
sc
har
ge S
H
<
20F
Hi
gh pr
es
su
re
>
490p
si
Hi
gh pr
es
su
re
<
255p
si
LS
V
S
C
>
12F
LS
V
S
C
<
4F
O
D
SS
V SH
>
2
0F
O
D
SS
V SH
<
4
F
Low pr
es
su
re
>
185ps
i
Low pr
es
su
re
<
100ps
i
Reques
ted %
dem
and <
A
ct
ual
%
dem
and
Reques
ted %
dem
and >
A
ct
ual
%
dem
and
Repeat
ed
s
top/
st
ar
t
Weak
c
ool
in
g
N
o s
w
itc
h c
oo
lin
g
Noi
se
S
top oper
at
io
n
Liquid stop valve does not fully open
X
X
X
X
X
X
X
X
X
X
Gas stop valve does not fully open
X
X
X
X
X
X
Line set restriction
X
X
X
X
X
X
X
X
X
X
Line set length is too long
X
X
X
X
X
Blocked filter-dryer
X
X
X
X
X
X
X
X
X
X
EEV coil failure
X
X
X
X
EEV failure
X
X
X
High Pressure switch failure
X
Pressure sensor failure
X
X
X
X
X
X
X
OD control board failure
X
Discharge temp sensor failure
X
X
X
X
X
X
X
X
X
Coil temp sensor failure
X
X
X
X
X
X
X
X
Defrost sensor failure
Liquid temp sensor failure
Ambient temp sensor failure
X
X
X
X
X
X
X
OD recirculation
X
X
X
X
X
X
X
ID recirculation
X
X
X
X
X
X
X
X
Dirty OD Heat-exchanger
X
X
X
X
X
X
X
Dirty ID Heat-exchanger
X
X
X
X
X
X
X
X
X
outdoor Ambient temp is too high
X
X
X
X
X
X
X
X
Outdoor Ambient temp is too low
X
X
X
X
X
X
X
X
X
ID suction temp is too high
X
X
ID suction temp is too low
X
X
X
X
X
X
X
X
X
Mixture of non-condensible gas
X
X
X
X
X
X
X
X
X
X
OD fan motor failure
X
X
X
X
X
X
X
X
X
RV failure
X
X
X
X
X
X
X
X
X
RV coil failure
X
X
X
X
X
X
X
X
X
Over charge
X
X
X
X
X
X
X
X
X
X
Under charge
X
X
X
X
X
X
X
X
X
Leak
X
X
X
X
X
X
X
X
X
X
X
TXV failure
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
TXV size is small
X
X
X
X
X
X
X
TXV size is big
X
X
X
X
X
X
X
X
Compressor failure
X
X
X
X
X
X
X
X
X
X
Cooling loop is not attached
X
X
X
Cooling loop grease is not enough
X
X
X
Compressor and Gas furnace are operating at the sametime
X
Low ID CFM
X
X
X
X
X
X
X
X
X
OD: 67-115F
ID: 65-85F
COOLING ANALYSIS CHART