I have a 20 yr. old, Heat-N-Glo SL32 direct vent. It has the Fenwal Direct Spark Ignition and it will not light.
In fact, it’s been this way for about 10 years and it’s time to fix it or replace it. I removed the logs and did a thorough cleaning including sanding the spark rod and ground on the igniter. I also cleaned ground wire & igniter wire contacts. I then checked continuity of the grounds and the spark igniter rod & wire. Everything is in order.
With the gas on, I flipped the rocker switch to ON and I hear a faint high-pitched whine (which I assume is the gas valve purging?) for about 4-5 sec. then it shuts off with no spark & no flame (lockout?). Repeated attempts fail also.
I do get a spark if I turn the rocker switch off after 1-2 seconds. So the module is capable of producing a spark.
I’ve also unhooked the spark igniter wire at the module then placed a grounded wire 3/16” from that connection and flipped the rocker switch on. Here again, I do get a spark when I switch off the rocker.
Questions: What is the normal spark pattern? Should the module/igniter be constantly sparking during the initial 4-5 secs. Or does it only spark once at the end of purge? Is this module dead or should I try some other test? Maybe it’s not getting gas and therefore shuts down because it does not sense a flame? I'm a novice with these systems.
In fact, it’s been this way for about 10 years and it’s time to fix it or replace it. I removed the logs and did a thorough cleaning including sanding the spark rod and ground on the igniter. I also cleaned ground wire & igniter wire contacts. I then checked continuity of the grounds and the spark igniter rod & wire. Everything is in order.
With the gas on, I flipped the rocker switch to ON and I hear a faint high-pitched whine (which I assume is the gas valve purging?) for about 4-5 sec. then it shuts off with no spark & no flame (lockout?). Repeated attempts fail also.
I do get a spark if I turn the rocker switch off after 1-2 seconds. So the module is capable of producing a spark.
I’ve also unhooked the spark igniter wire at the module then placed a grounded wire 3/16” from that connection and flipped the rocker switch on. Here again, I do get a spark when I switch off the rocker.
Questions: What is the normal spark pattern? Should the module/igniter be constantly sparking during the initial 4-5 secs. Or does it only spark once at the end of purge? Is this module dead or should I try some other test? Maybe it’s not getting gas and therefore shuts down because it does not sense a flame? I'm a novice with these systems.
