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41
SERVICING
PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES
Co
mf
ortNet ™
Therm
ostat Onl
y
Sym
ptom
s of Abnorm
al Operation
(Comm
unicating &
Non-co
mm
unicating
Therm
ostat
)
Diagnostic/Status
LED Codes
Fault Description
Message
Code
Possible Cause
s
Corrective Actions
Notes & Caution
s
Air handler fails to operate.
Integr
ated contr
ol m
od
ule LED display
provides
indicated
error code.
Co
mf
ortNet™ ther
mo
stat “
Call for
Service”
i
con illuminated.
Co
mf
ortNet ther
mo
stat scrolls
“C
heck Air
Handler” m
essage.
6 Flashes
Circulator
b
lower
mo
tor
fails
to
s
tart
1
0
consecutive
ti
me
s.
MTR LCKD
ROTOR
b5
Obstruction in circulator blower
housing.
Seized circulator blower m
otor
bearings.
Failed circulator blower m
otor.
Check circulator blower for
obstructions. Rem
ove and
repair/replace wheel/m
otor if
necessar
y.
Check circulator blower m
otor
shaft
ro
tation and m
otor
.
Replace m
otor
i
f
necessar
y.
Turn power OFF prior to
repair
Replace m
otor w
ith
co
rrect
replace
me
nt
p
art.
Replace w
he
el with co
rrect
replacem
ent
part.
Air handler fails to operate.
Integr
ated contr
ol m
od
ule LED display
provides
i
ndicated error code.
Co
mf
ortNet
the
rm
ostat “
Call for Service”
icon
i
llum
inated.
Com
fortNet
t
herm
ostat scrolls “
Check Air
Handler”
me
ssage.
6 Flashes
Circulator
blower m
otor
shuts do
wn
for over or
under
voltage condition.
Circulator
b
lower
mo
tor
shuts
do
wn
due to over
te
mp
erature condition on
power m
odule.
MOTOR
VOLTS
b6
High AC line voltage to air
handler.
Low AC line voltage to air
handler.
High am
bient tem
peratures.
Check power to air handler.
Verify line voltage to blower is
within the range specified on the
air handler rating plate.
See "Installation Instructions" for
installa
tion requirem
ents.
Turn power OFF prior to
repair.
Air handler fails to operate.
Integr
ated contr
ol m
od
ule LED display
provides
indicated
error code.
Co
mf
ortNet
the
rm
ostat “
Call for Service”
icon
i
llum
inated.
Com
fortNet
t
herm
ostat scrolls
“C
heck Air
Handler” m
essage.
6 Flashes
Circulator
b
lower
mo
tor
does
n
ot have enough
inform
ation
to
operate
properly
.
Motor fails
to
s
tart 40
consecutive
tim
es.
MOTOR
PARAMS
b7
Error with integrated control
m
odule.
Motor has a locked rotor
condition.
Check integrated control m
odule.
Verify control is populated with
correct shared data set. See data
errors above for details.
Check for locked rotor condition
(see error code above for
details).
Turn power OFF prior to
repair.
Replace with correct
replacem
ent
part(s).
Use m
em
ory card for
the
specif
ic m
odel.
Air handler operates
at reduced
perform
ance or operates on low stage
when high stage is expected.
Integr
ated contr
ol m
od
ule LED display
provides
indicated
error code.
6 Flashes
Airflow is lower than
dem
anded.
LOW ID
AIRFLO
W
b9
Blocked filters.
Restrictive ductwork.
Undersized ductwork.
Check filters for
blockage.
Clean filters or rem
ove
obstruction.
Check ductwork for blockage.
Rem
ove obstruction.
Verify all
registers are full
y
open.
Verify ductwork is appropriately
sized for
s
y
ste
m.
Resize
/replace
ductw
ork
i
f necessar
y.
Turn power OFF prior to
repair.