Form 43343530
Aug 2012
-45-
22.0)
TROUBLESHOOTING GUIDE
T
urn on the gas
valve?
No
Y
es
Is the knob on the gas
valve turned to the
ON position?
No
Y
es
Are the blue wires
secure in the
terminals and firmly
on the ignition
module terminals?
Move orange wire to
NO terminal. Rest
art
troubleshooting.
Replace motor
.
Remove any
obstructions. Repeat
st
art up. If motor will
not run. replace
motor
.
No
Y
es
Disconnect the power
and check the blower
wheel. Does it turn
freely?
No
Y
es
During st
art up, is
there 120V between
ground and the IND
terminal on the
module?
Clean out hoses and
probes.
Switch hoses on the
pressure t
ap
s.
Check NO terminal of
the air switch
connection. Replace
red light.
No
Y
es
T
urn on line volt
age
and adjust thermost
at
to the highest setting.
Does the red
monitoring light come
on?
No
Y
es
Does the blower
come on?
No
Y
es
Does the LED on the
ignition module flash
once?
No
Y
es
Is the black t
ap on the
air switch connected
to the upper probe?
Check the probes and
hoses to the air switch
are they clear and
unobstructed?
Replace air switch.
No
Y
es
Is 120V at the terminal
block in the blower?
Check line volt
age
circuit. Rep
air fault.
No
Y
es
Is there 120V
between ground and
the L1 terminal on the
module?
No
Y
es
Check terminals for
continuity and rep
air
.
No
Y
es
Is the LED on the
ignition module
steady ON?
No
Y
es
Is there 24V between
the inlet to the fuse
carrier and the
ground?
No
Y
es
Is there 24V on the
other side of the fuse
carrier?
No
Y
es
Is there 24V between
both terminals of the
TISS and ground?
No
Y
es
The
TISS has broken
continuity
. Check the
first tube and reflector
is there a hole?
Check
TISS wire for
a break if it is close to
the terminal rep
air
.
Otherwise replace
TISS wire.
Replace heat
exchanger tube,
reflector and
TISS.
No
Y
es
Is there 24V between
both terminals of the
thermost
at connection
and ground?
No
Y
es
Does the system have
a 24V individual
thermost
at?
No
Y
es
Is 120V at the terminal
block in the blower?
Check that red wire is
connected to
TH from
air switch terminal C.
Rep
air connection.
Replace ignition
modules.
Rep
air or replace
jumper check all wire
terminals.
Rep
air or replace
thermost
at. Check
external wiring.
Replace ignition
module.
Check terminals for
continuity at
transformer
. If they
are good, replace
transformer
.
if fuse carrier is tight
and the fuse has no
continuity
, replace the
fuse.
No
Y
es
Does the blower st
ay
on?
No
Y
es
Does the LED on the
ignition module flash
once?
No
Y
es
Is the orange wire
from PSW connected
to the NO terminal of
the air switch?
No
Y
es
Are air switch
terminals jumpered?
Remove jumper
, air
switch must be open
circuit first for blower
to operate.
Air switch is stuck in
the closed position.
Replace air switch.
Move black light wire
to NO terminal of the
air switch. Rest
art the
troubleshooting.
No
Y
es
Does the low fire
amber light come on?
No
Y
es
Is the LED on the
ignition module
steady ON?
No
Y
es
Af
ter 15 seconds
post purge is there
24V between V1 and
V2 ignition module
terminals?
Replace ignition
module.
Replace ignition
module.
Rep
air connection.
Rest
art
troubleshooting.
No
Y
es
Are the black wires
to the amber light
securely on the gas
valve terminals?
Rep
air connection.
Rest
art
troubleshooting.
Replace amber light.
Rest
art
troubleshooting.
T
roubleshooting
continued on the next
p
age.
