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Does
spark stop
when pilot
lights?
24 volts
across
terminals 2&3
at S8600?
Spark
across
ignitor/sensor
gap?
Y
Can you
hear
sparking?
*Faulty
S8600
module
*Break in
spark cable
insulation
*Break in pilot
porcelain
*Incorrect pilot
spark gap
*Loose
connection in
spark cable
*Loose
ground
connection
N
Pilot
lights?
Y
NN
*Defective
S8600 module
24 volts
across PV &
MV/PV at gas
val ve?
*Defective EI
wiring
harness.
N
*Loose connection in
ignition cable or
ground wire
*Pilot electrode
porcelain cracked
*Pilot flame not
covering gap
between electrode
and grounding
strap
*Low gas pressure
at gas valve inlet
*Defective S8600
module
Main
burner
lights?
N
Y
24VAC
across
terminals 1&2
on S8600?
Y
N
N
*Defective
S8600
module
24 volts
between MV &
MV/PV on gas
val ve?
*Defective
gas valve
*Defective EI
harness
END
START
(24 volts is present across 5 and 6 on S8600
module, but main burners do not light)
N
Y
Y
N
Y
Y
Y
* Low line pressure
*Plugged, kinked or leaking
pilot tubing
*Plugged pilot orifice
*Gas line not purged of air
*Defective pilot assembly
*Defective gas valve
Intermittent Ignition System Troubleshooting Chart
Caution: Read page 29 before
attempting to use this chart