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Form #43343330
May 08 –43–
22.0) TROUBLESHOOTING GUIDE
No
Yes
Are the blue wires
secure in the
terminals and firmly
on the ignition
module terminals?
Move orange wire to
NO terminal. Restart
troubleshooting.
Replace motor.
Remove any
obstructions. Repeat
start up. If motor will
not run. replace
motor.
No
Yes
Disconnect the power
and check the blower
wheel. Does it turn
freely?
No
Yes
During start up, is
there 120V between
ground and the IND
terminal on the
module?
Clean out hoses and
probes.
Switch hoses on the
pressure taps.
Check NO terminal of
the air switch
connection. Replace
red light.
No
Yes
Turn on line voltage
and thermostat. Does
the red monitoring
light come on?
No
Yes
Does the blower
come on?
No
Yes
Does the LED on the
ignition module flash
once?
No
Yes
Is the black tap 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
Yes
Is 120V at the terminal
block in the blower?
Check line voltage at
thermostat and line
voltage circuit. Repair
fault.
No
Yes
Is there 120V
between ground and
the L1 terminal on the
module?
No
Yes
Check terminals for
continuity and repair.
No
Yes
Is the LED on the
ignition module
steady ON?
No
Yes
Is there 24V between
the inlet to the fuse
carrier and the
ground?
No
Yes
Is there 24V on the
other side of the fuse
carrier?
No
Yes
Is there 24V between
both terminals of the
TISS and ground?
No
Yes
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 repair.
Otherwise replace
TISS wire.
Replace heat
exchanger tube,
reflector and TISS.
No
Yes
Is there 24V between
both terminals of the
thermostat connection
and ground?
No
Yes
Does the system have
a 24V individual
thermostat?
No
Yes
Is 120V at the terminal
block in the blower?
Check that red wire is
connected to TH from
air switch terminal C.
Repair connection.
Replace ignition
modules.
Repair or replace
jumper check all wire
terminals.
Repair or replace
thermostat. 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
Yes
Is the blower on?
No
Yes
Does the LED on the
ignition module flash
once?
No
Yes
Is the orange wire
from PSW connected
to the NO terminal of
the air switch?
No
Yes
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. Restart the
troubleshooting.
No
Yes
Does the amber light
come on?
No
Yes
Is the LED on the
ignition module
steady ON?
No
Yes
After 15 seconds
post purge is there
24V between V1 and
V2 ignition module
terminals?
Replace ignition
module.
Replace ignition
module.
Repair connection.
Restart
troubleshooting.
No
Yes
Are the black wires
to the amber light
securely on the gas
valve terminals?
Repair connection.
Restart
troubleshooting.
Replace amber light.
Restart
troubleshooting.
Troubleshooting
continued on the next
page.