G
G77x Intermittent Pilot Ignition Controls Technical Bulletin
17
Start
Check for defective transformer,
thermostat, or faulty wiring
Is 24 VAC
present between
Terminal 2 and
ground?
Open thermostat contacts for
30 seconds and then close
Yes
Is
spark present
now?
Yes
No
System was in lockout, causes
include flameout or an internal fault
Did
pilot remain lit
from previous
cycle?
Replace
gas valve
Turn off
supply voltage
Yes
No
No
Is spark
cable securely
connected to ignition
control?
Is
spark cable
brittle, burnt, or
cracked?
Is spark
electrode ceramic
cracked?
Is spark
gap per manufacturer’s
specifications and
located in pilot gas
stream?
Replace
control
End
Yes
No
No
Correct or
replace pilot
burner
Yes
Replace pilot
burner
No
Yes
Replace
cable
Yes
No
Correct
Figure 12: No Spark, and System Does Not Work
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