GC9C96 Service Manual

SERVICING
32

A ame sensing device is used in conjunction with the ignition
control module to prove combustion. If proof of ame is not
present the control will de-energize the gas valve and “retry”
for ignition or lockout.

G TG

T

R BR RG R
TG T T

T R R 
B RT

R T     RRT
G R JR R T
Flame current can be measured by:
1. Putting a D.C. microamp meter in series with the ame
rod

 TG  RT

2. As soon as ame is established a micro-amp reading
should be evident once proof of ame (micro-amp reading)
is established, the hot surface ignitor will be de-energized.
3. The Integrated Ignition controls will have 1 to 4 micro-
amps. If the micro-amp reading is less than the minimum
specied, check for high resistance wiring connections,
sensor to burner gap, dirty flame sensor, or poor
grounding.
4. If absolutely no reading, check for continuity on all
components and if good - replace ignition control module.
 Contaminated fuel or combustion air can create a
nearly invisible coating on the ame sensor. This coating
works as an insulator causing a loss in the ame sense signal.
If this situation occurs the ame sensor must be cleaned with
steel wool.