Goodman GMV series - Page 106

106
SERVICING
Symptoms of
Abnormal Operation
Fault Description(s) Possible Causes Corrective Action
Cautions and
Notes
- Stays at low CFM despite system call for cool or heat CFM.
- 24 Vac wires miswired or loose. - "R" missing/not connected at motor. - Fan is delay mode.
- Check low voltage (Thermostat) wires and connections. - Verify fan is not in delay mode - wait until delay complete. - Perform motor/control replacement check, ICM-2 motors only.
- Turn power OFF prior to repair. Wait 5 minutes after disconnecting power before opening motor. - Handle electronic motor/control with care.
- Stays at high CFM.
- "R" missing/not connected at motor. - Fan is delay mode.
- Is fan in delay mode? - wait until delay time complete. - Perform motor/control replacement check, ICM-2 motors only.
- Turn power OFF prior to repair. Wait 5 minutes after disconnecting power before opening motor. - Handle electronic motor/control with care.
- Blower won't shut off.
- Current leakage from controls into G, Y, or W.
- Check for Triac switched t'stat or solid state relay.
- Turn power OFF prior to repair.
- Air noise.
- High static creating high blower speed. - Incorrect supply or return ductwork. - Incorrect or dirty filter(s). - Incorrect blower speed setting.
- Check/replace filter. - Check/correct duct restrictions. - Adjust to correct blower speed setting.
- Turn power OFF prior to repair.
- Noisy blower or cabinet.
- Loose blower housing, panels, etc. - High static creating high blower speed. - Air leaks in ductwork, cabinets, or panels.
- Check for loose blower housing, panels, etc. - Check for air whistling thru seams in ducts, cabinets or panels. - Check for cabinet/duct deformation.
- Turn power OFF prior to repair.
- "Hunts" or "puffs" at high CFM (speed).
- High static creating high blower speed. - Incorrect or dirty filter(s). - Incorrect supply or return ductwork. - Incorrect blower speed setting.
- Does removing panel or filter reduce "puffing"? - Check/replace filter. - Check/correct duct restrictions. - Adjust to correct blower speed setting.
- Turn power OFF prior to repair.
- Evidence of Moisture.
- Motor failure or malfunction has occurred and moisture is present.
- Moisture in motor/control module.
- Replace motor and perform Moisture Check.*
- Turn power OFF prior to repair. Wait 5 minutes after disconnecting power before opening motor. - Handle electronic motor/control with care.
Troubleshooting Chart for ECM/ICM Variable Speed Air Circulator Blower Motors
- Excessive noise. - Motor starts, but runs erratically.
CHART CONTINUED FROM PREVIOUS PAGE
NOTE: You must use the correct replacement control motor module since they are factory programmed for specific operating
modes. Even though they look alike, different modules may have completely different functionality. The ICM-2 variable speed motors are currently the only motors that can have the motor/control module replaced.
IMPORTANT NOTE: Using the wrong motor/control module voids all product warranties and may produce unexpected results.
*M
o
i
sture
Ch
ec
k
-
C
onnectors are or
i
ente
d
"d
own
"
(
or as recommen
d
e
d
b
y equ
i
pment manu
f
acturer
)
.
-
A
rrange
h
arnesses w
ith
"d
r
i
p
l
oop
"
un
d
er mo
t
or.
-
I
s con
d
ensate
d
ra
i
n p
l
ugge
d?
-
Ch
ec
k
f
or
l
ow a
i
r
fl
ow
(
too muc
h
l
atent capac
i
ty
)
.
-
Ch
ec
k
f
or un
d
erc
h
arge
d
con
diti
on.
-
Ch
ec
k
an
d
p
l
ug
l
ea
k
s
i
n return
d
ucts, ca
bi
net.