I've noticed recently on my spark-ignitied (not standing pilot) Olson Mini
Max furnace that the spark ignition runs a LOT longer before it stops and
fires than it did before.
in the last 1.5 years here, the furnace has just "bzzzz.poof", sparking for
maybe 4 or 5 seconds at most and lighting without fail. Now
(internittently) the unit will spark for 15 or 20 seconds and seems to
"timeout" and then light. other times it lights perfectly.
in my gas fireplace adventures, I know that there is a part in the furnace
that detects the presence of flame to tell the unit that the pilot is lit
(so stop sparking, and open the gas valve). what is the proper name for
this part? it seems that these devices are right at the front and fairly
I am a handy person and really really hate to give money to a technician to
do super simple repairs....
These systems use a probe to electronically detect the pilot flame.
It's called "flame rectification". (Do a GOOGLE.)
Some systems use the same electrode for both the spark and
the flame detection; others use a separate probe.
If the probe is dirty or the plating gone, proper detection
will be sporadic. You can try cleaning it or replacing.
That part should be available.
I see the sparker with a large orange cable running to it. being the cold
season, the furnace is running reasonably often....so she's too hot to touch
right now and take a peek ;)
I will, however, disassemble tomorrow when its cool and take a closer look.
i've got a handy furnace power interupter switch right on the wall.....so I
can simply crank the tstat and stop the furnace from firing with the switch.
take apart, clean, and test fire without having to go all the way back
upstairs (heheh). sounds like a plan to me!
if cleaning the flame detection probe cleaning doesn't yeild improvement -
where do you think I can prodcure an additional one? also, what about an
installation/assembly manual for this furnace so I can see how it comes
thanks for the help!
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.