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40
SERVICING
PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES
Co
mf
ortNet ™
Therm
ostat Only
Sym
pto
ms
of Abnorm
al Operation
(Comm
unicating &
Non-co
mm
unicating
Ther
mo
stat)
Diagnostic/Status
LED Codes
Fault Descriptio
n
Message
Code
Possible Cause
s
Corrective Action
s
Notes & Cautions
Air handler fails to operate.
Integ
ra
ted cont
ro
l
mo
dule LED displa
y
provides
i
ndicated error code.
Co
mf
ortNet
ther
mo
stat “
Call for Service”
icon
i
llum
in
ated.
Co
mf
ortNet therm
ostat scrolls “
Check Air
Handler” m
essage.
6 Flashes
Circulator
blower m
otor
is
not running when it
should be running.
MOTOR
NOT RUN
b0
Loose wiring connection at
circulator
mo
tor po
we
r leads or
circulator
mo
tor
pow
er leads
disc
onnected.
Failed circulator blower m
otor.
Tighten
o
r correct wiring
connection.
Check circulator blower m
otor.
Replace if necessary
.
Turn power OFF prior to
repair
Replace circulator motor
with correct replacement
part.
Air handler fails to operate.
Integr
ated contr
ol m
od
ule LED display
provides
indicated error code.
Co
mf
ortNet
t
herm
ostat
“C
all for Service”
icon
i
llum
in
ated.
Com
fortNet
ther
mo
stat scrolls “
Check Air
Handler” m
essage.
6 Flashes
Integ
ra
ted cont
ro
l
m
odule
has
l
ost
comm
unications with
circulator
blower m
otor.
MOTOR
COMM
b1
Loose wiring connection at
circulator
mo
tor control
l
eads.
Failed circulator blower m
otor.
Failed integrated control
mo
dule.
Tighten
o
r correct wiring
connection.
Check circulator blower m
otor.
Replace if necessary
.
Check integrated control m
odule.
Replace if necessary
.
Turn power OFF prior to
repair
Replace circulator motor
with correct replacement
part.
Replace
integrated control
m
odule with
correct
replacem
ent
part.
Air handler fails to operate.
Integ
ra
ted contr
ol m
od
ule LED display
provides
indicated error code.
Co
mf
ortNet
ther
mo
stat “
Call for Service”
icon
i
llum
in
ated.
Com
fortNet
therm
ostat scrolls “
Check Air
Handler” m
essage.
6 Flashes
Circulator
blower m
otor
hor
se
power in shared
data s
et
does not m
atch
circulator
blower m
otor
hor
se
power.
MOTOR
MISMATCH
b2
Incorrect circulator blower
mo
tor
in air
h
andler.
Incorrect shared
data
s
et
in
integrated control m
odule.
Verify
circulator blower
mo
tor
hor
se
power is the sam
e
specified for the specific air
handler m
odel. Replace is
necessar
y.
Verify
shared data set is correct
for the specific m
odel. Re-
populate
d
ata using co
rrect
me
mo
ry
card if required.
Turn power OFF prior to
repair
Replace
mo
tor w
ith
co
rrect
replace
me
nt
p
art.
Use m
em
ory card for
the
specif
ic m
odel
Insert
me
mo
ry
card
BEFORE turning power
ON. Mem
ory
card may
be
re
mo
ved after
data is
lo
ad
ed
.
Turn power OFF before
re
mo
ving m
em
or
y
card.
Error code w
ill be cl
eared
once shared data and
mo
tor horse
p
ower match.
Air handler operates
at reduced
perform
ance.
Airflow delivered is less than expected.
Integ
ra
ted cont
ro
l
mo
dule LED displa
y
provides
b
3
error code.
6 Flashes
Circulator
blower m
otor
is
operating
in a power,
te
mp
erature, or speed
li
mi
ting condition.
MOTOR
LIMITS
b3
Blocked filters.
Restrictive ductwork.
Undersized ductwork.
High am
bient te
mp
eratures.
Check filters for
blockage.
Clean filters or rem
ove
obstruction.
Check ductwork for blockage.
Re
mo
ve obstruction.
Ve
rify
all
registers are full
y
open.
Verify ductwork is appropriately
sized for
s
y
ste
m.
Resize
/replace
duct
wo
rk
if necessary
.
See "Installation Instructions" for
installa
tion require
me
nts.
Turn power OFF prior to
repair.
Air handler fails to operate.
Integ
ra
ted cont
ro
l
mo
dule LED displa
y
provides
indicated
error code.
Co
mf
ortNet
ther
mo
stat “
Call for Service”
icon
i
llum
in
ated.
Com
fortNet
therm
ostat scrolls “
Check Air
Handler” m
essage.
6 Flashes
Circulator
blower m
otor
senses a loss rotor
control.
Circulator
blower m
otor
senses high current.
MOTOR
TRIPS
b4
Abnorm
al m
otor
loading, sudden
change in speed or torque, sudden
blockage of air
h
andler/coil ai
r
inlet or
o
utlet.
High loading conditions, blocked
filters, ver
y
restrictive ductw
ork,
blockage of air
h
andler/coil a
ir
inlet or
o
utlet.
Check filters, filter
grills/registe
rs
, duct system
, and
air handler/coil air inlet/outlet for
bloc
ka
ge
s.
Turn power OFF prior to
repair.