Service Instructions

SERVICING
97
- Connectors are oriented "down"
(
or as recommended b
y
equipment manufacturer
)
.- Arran
g
e harnesses with "drip loop" under motor.
-
I
s con
d
ensa
t
e
d
ra
i
n p
l
u
gg
e
d?
-
Ch
ec
k
f
or
l
ow a
i
r
fl
ow
(t
oo muc
h
l
a
t
en
t
capac
ity)
.
-
Check
for
undercharged
condition
. -
Check
and
plug
leaks
in
return
ducts
,
cabinet
.
*Moisture Check
I
mpor
t
an
t
N
o
t
e:
U
s
i
n
g
th
e wron
g
mo
t
or
/
con
t
ro
l
mo
d
u
l
e vo
id
s a
ll
pro
d
uc
t
warran
ti
es an
d
ma
y
pro
d
uce unexpec
t
e
d
resu
lt
s.
Note:
You must use the correct replacement control/motor module since the
y
are factor
y
pro
g
rammed for specific operatin
g
modes. Even thou
g
h the
y
look alike, different modules ma
y
have completel
y
different
functionality. The ECM variable speed motors are c
Symptom Fault Description(s) Possible Causes Corrective Action Cautions and Notes
- Motor rocks slightly w hen starting.
- This is normal start-up for variable speed motor.
---- ---- ----
- No movement.
- Manual disconnect sw itch off or door sw itch open. - Blow n fuse or circuit breaker. - 24 Vac w ires misw ired. - Unseated pins in w iring harness connectors. - Bad motor/control module. - Moisture present in motor or control module.
- Check 230 Vac pow er at motor. - Check low voltage (24 V ac R to C) at motor. - Check low voltage connections (G, Y, W, R, C) at motor. - Check for unseated pins in connectors on motor harness. - Test w ith a temporary jumper betw een R - G. -
- Turn pow er OFF prior to repair. Wait 5 minutes after disconnecting pow er before opening motor. - Handle electronic motor/control w ith care.
- Motor rocks, but w on't start.
- Loose motor mount. - Blow er w heel not tight on motor shaft. - Bad motor/control module.
- Check for loose motor mount. - Make sure blow er w heel is tight on shaft. - Perform motor/control replacement check, ECM motors only.
- Turn pow er OFF prior to repair. Wait 5 minutes after disconnecting pow er before opening motor. - Handle electronic motor/control w ith care.
- Motor oscillates up & dow n w hile being tested off of blow er.
- It is normal for motor to oscillate w ith no load on shaft.
---- ---- ----
- Varies up and dow n or intermittent.
- Variation in 230 Vac to motor. - Unseated pins in w iring harness connectors. - Erratic CFM c ommand f rom "BK" terminal. - Improper thermostat connection or setting. - Moisture present in motor/control module.
- Check line voltage for variation or "sag". - Check low voltage connections (G, Y, W, R, C) at motor, unseated pins in motor harness connectors. - Check-out system controls - Thermostat. - Perform Moisture Check.*
- Turn pow er OFF prior to repair.
- "Hunts" or "puffs" at high CFM (speed).
- Incorrect or dirty filter(s). - Incorrect supply or return ductw ork. - Incorrect blow er speed setting.
- Does removing panel or filter reduce "puffing"? - Check/replace filter. - Check/correct duct restrictions. - Adjust to correct blow er speed setting.
- Turn pow er OFF prior to repair.
Troubleshooting Chart for GE/Regal-Beloit ECM Variable Speed Air Circulator Blower Motors
- Motor w on't start. - Motor starts, but runs erratically.
CHART CONTINUED ON NEXT PAGE