ITH-Series Technical Manual
Page 33
Cambridge
Engineering
Inc.
Troubleshooting Chart
Troubleshooting Chart
YE
S
YE
S
YES
YES
YES
YES
YE
S
YE
S
YE
S
NO
NO
NO
NO
NO
NO
Check Air Lin
e
s
To
Swi
tc
h
Check Burner
System
For Obstruction
Rep
lace Valve
Ch
eck For 24V
At
Swi
tc
h
Rectify Transfo
rmer
Or
Wirin
g
As Require
d
Re
cti
fy As Requi
red
Rectify As
Required
Rectify As
Required
Is Valve
In On
Position?
R
epl
ace Ignitio
n
Con
tro
l Module
Is Pres
sure S
w
itc
h
Opera
ting?
Unpl
ug Motor
Do
es Motor/Impeller
Sp
in Freely?
IF PROBLEM PERSISTS
C
O
NTAC
T YOUR LOCA
L
CA
MB
RI
DGE
ENGI
NEERI
N
G
REP
R
ES
ENTATI
VE
Veri
fy Sense
Electrode
Verify Gr
ound
V
e
rify Wiring
D
oes 24V Occur
At
Va
lve During
Ig
nitio
n Trial?
Check
Wiri
ng and
Rectify
As requ
ired
Che
c
k Electrode Gap
Se
t to 1/8"
Repl
ace Motor If
Requ
ired
C
heck 120V
Power
V
e
rify at
M
o
tor
Is The
re A
Fl
ame
Si
gna
l To
Module?
Min. 0
.8
Micro Amps
Is
Gas Present At
Va
lve? Is
Gas
Pressure Sufficient?
Che
c
k Igni
tion
Wire
Repl
ace If
Damage
d
Check Thermostat
Re
pla
c
e
If Required
Burner
Stay
s
Lit?
Burner
Li
ghts?
Does
Electrode
Spark?
Bl
ower
Star
ts
?
Turn Up
The
rmostat
TROUBLESHOOTING CHART
YES
Rep
lace Module
if
no pow
er to
Motor
