CTHN-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
82 of 91
18.2 Troubleshooting Flow Chart - Multiburner
Is ther
e spar
k at the ignit
er?
YES
NO
Tu
rn up ther
most
at.
Does the f
an tur
n on?
R
eplace pr
essur
e s
w
itch.
YES
NO
R
eplace tr
ansf
or
mer
.
YES
NO
R
emo
ve obstr
uction.
YES
NO
YES
NO
R
eplace f
an.
NO
YES
NO
YES
NO
YES
ST
AR
T
YES
NO
NO
YES
NO
Is the f
an obstr
uct
ed?
R
emo
ve obstr
uction.
NO
NO
YES
R
eplace ignition module
.
R
econnect tr
ansf
or
mer
w
ire
s.
Place a jumper w
ire
acr
oss the pr
essur
e s
w
itch.
Is ther
e a spar
k?
W
ith the b
lue and y
ello
w
w
ires still r
emo
ved, is the
volt
age at the tr
ansf
or
mer
blac
k and whit
e leads 1
20
V?
Chec
k w
iring bet
w
een the
po
w
er cor
d, f
an mot
or
and tr
ansf
or
mer
.
R
eplace ignit
er and
ignition w
ire as needed.
C
ar
efull
y r
eset ignit
er g
ap
to 1/8"
Ar
e the air hoses t
o the
pr
essur
e s
w
itch secur
e and
leak fr
ee?
R
epair
, r
eplace
, or tight
en
hoses as necessar
y.
Is the v
ent pipe or the inlet of
the b
ur
ner obstr
uct
ed?
Is the ignit
er g
ap
set at 1/8"?
Unplug b
ur
ner and chec
k
ignit
er and ignition w
ire
. A
re
the
y damaged?
Fan bear
ings ma
y ha
ve
failed.
R
eplace f
an.
Chec
k r
ela
y w
iring
(if applicab
le) and w
iring
to the f
an.
Chec
k ther
most
at w
iring
and r
eplace ther
most
at if
necessar
y.
Place a jumper acr
oss the
ther
most
at t
er
minals
.
Does the b
lo
w
er tur
n on?
Is ther
e po
w
er (1
20
V) at
the f
an?
Unplug f
an.
Does the
fan tur
n fr
eel
y?
YES
R
emo
ve the b
lue and y
ello
w
w
ires fr
om the tr
ansf
or
mer
.
Is ther
e 24
V at the
transf
or
mer secondar
y?
