Refrigeration Diagnosis
164
•
•
Loose or broken electrical connections
•
•
•
•
•
Sensor out of calibration
•
•
•
•
Compound pressure gauge out of calibration
•
Leaky receiver tank outlet valve
•
Leaky bypass check valve
•
Leaky condenser check valve
•
Faulty three-way condenser pressure bypass check valve
•
•
•
•
•
Faulty ETV
•
•
•
•
•
Hot gas bypass valve stuck open or leaking
Rapi
d c
y
c
ling between c
ool
and heat
Uni
t c
ool
s
i
n heat and defr
os
t c
y
c
le
Uni
t heat
s
i
n r
efri
ger
ati
on c
y
c
le
Hi
gh head pr
es
s
u
re
Low head pres
s
u
re
Hi
gh s
uc
tion pres
s
ur
e
Low s
u
c
ti
on pr
es
s
u
re
No s
u
c
ti
on pr
es
s
u
re
Uni
t oper
ati
ng in a v
ac
uum
Rec
e
iv
er
s
ight gl
as
s
empty
S
u
c
ti
on line fros
ting bac
k
Unabl
e to pump down s
y
s
tem
Unabl
e to pull
v
ac
uum in l
ow
s
ide
Unabl
e to hold v
ac
uum i
n low s
ide
N
o
is
y
co
mp
re
ss
o
r
Uni
t not r
efri
ger
ati
ng
Uni
t not heating or defros
ting
Sym
p
to
m
Possible Causes
