58
Enertech Global
IOM, BS/BT Models
Check for proper
compressor nameplate
voltage.
Attempt to restart
the compressor
OK
Allow to start the
compressor while
measuring voltage
on the load side of
the contactor.
Allow time for
compressor to
balance.
OK
Check motor
resistance.
(See Note B)
OK
Check voltage supply
& contactor operation.
Compressor
Connection Block
S
Replace Compressor
Not
OK
Yes
Recheck Resistance
Allow time for the
protector to reset.
No
Yes
Is the compressor
hot?
OK
Not
If the compressor
fails to start after
3 attempts, replace
the compressor.
R
Is the voltage 197
or higher when the
compressor is trying
to start.
No
Voltage supply
is too low.
C
Yes
OK
Are the suction &
discharge pressures
balanced.
Does Compressor draw
current when voltage is
applied.
OK
No
Yes
Check the wiring,
capacitor & contactor
operation. (See Note A)
No
Yes
OK
Single Phase 208-230
C = Line Winding
R = Run Winding
S = Start Winding
R e fe r to th e c o m p re sso r
w o n 't sta rt flo w c h a rt.
Is th e c o m p re sso r
ru n n in g ?
N o
O K
S h u t th e u n it d o w n &
re v e rse th e p h a sin g
(3 - P h a se O n ly )
D o e s th e u n it
h a v e a re frig e ra n t
c h a rg e ?
M e a su re & re c o rd
th e a m p s, v o lts,
su c tio n & d isc h a rg e
p re ss u re .
Y e s
Y e s
If th e c o m p re sso r
s till w o n 't p u m p
re p la c e c o m p re sso r.
A d d re frig e ra n t
to th e sy ste m .
N o
C h e c k th e o p e ra tio n
o f th e re v e rsin g
v a lv e .
O K
O K
C h e c k & v e rify
th e ru n c a p a c ito r
O K
A: Check all terminals, wires & connections for loose or burned wires and connections. Check contactor and 24 Volt
coil. Check capacitor connections & check capacitor with capacitor tester.
B: If ohm meter reads 0 (short) resistance from C to S, S to R, R to C or from anyone of one of these terminals to
ground (shorted to ground), compressor is bad.
COMPRESSOR WON’T START
COMPRESSOR WON’T PUMP CHART
Section 12: Troubleshooting
Compressor Troubleshooting