Form 43343530
-46-
Aug 2012
Check external
thermost
at wiring and
thermost
at set point.
No
Y
es
Remove red wire
from the Low fire
terminal, is there 24V
at the center C
terminal?
No
Y
es
Is there 24V at the HI
terminal on the gas
valve?
No
Y
es
With the thermost
at
set to low fire only
does the low fire
amber light come on
af
ter 15 seconds?
No
Y
es
Is there 24V between
the thermost
at
terminal block low fire
cont
act and ground?
No
Y
es
Check terminal
connections, is the
yellow wire
connected to the high
fire terminal?
Check external
thermost
at wiring and
thermost
at set point.
Switch terminal
connections. Red wire
LO should be
connected to ignition
module W (TH)
terminal.
Rep
air terminal
connections. 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.
No
Y
es
Does the low fire
amber light st
ay on
p
ast 10 seconds?
No
Y
es
Check the micro
Amp
s at the FC-FC+
terminals of the
module is it greater
than 0.7
µA
with flame.
T
urn on the gas
valve?
Does LED on the
ignition module flash
three times?
Replace ignition
module.
Check flame sense
wire does it have
continuity?
Cont
act factory for
assist
ance.
Replace flame sense
wire.
Adjust terminal
connection. Rest
art
troubleshooting.
No
Y
es
Is the knob on the gas
valve turned to the
ON position?
No
Y
es
Through the
inspection window is
there a flame visible
during st
art up?
No
Y
es
Is the heater properly
grounded?
Correct grounding
problem.
No
Y
es
Check the terminal on
the flame sense
electrode, is it tight?
No
Y
es
Remove and inspect
flame sense
electrode. Is it clean
and the ceramic
int
act?
Rep
air or replace
flame sense
electrode.
See next p
age for
troubleshooting
sequence.
No
Y
es
Replace ignition
module.
No
Y
es
No
Y
es
Is there 24V at the HI
terminal on the gas
valve?
No
Y
es
Does the high fire
amber light come on?
No
Y
es
Is the there 24V
between the
thermost
at terminal
block high fire cont
act
and ground (yellow
wire)?
No
Y
es
Check terminal
connections to the
gas valve, are they
tight?
Check the red wires
C should be
connected to the
TISS
and LO connected to
W (TH) module
terminal.
Rep
air terminal
connections.
Rep
air terminal
connections. 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.
