When my Lennox gas furnace calls for heat the pilot valve open and the spark
ignitor lights the pilot. The ignitor keeps sparking as much as a hundred
times. Finally the main gas valve opens and produces the heating flame. The
furnace works ok, but I don't think this is normal.
Any suggestions please?
This is Turtle.
You have a extended spark timer sticking a little. It's not worth getting it
changed now but will go for years before it really screws up. It does not hurt a
thing to run it like that.
Thanks to those who replied.
I took a look inside the furnace and noticed the heat sensor in the pilot
flame. Also noted that the pilot lit on the first spark I took some fine
sandpaper and cleaned it. Wallah!! 3 clicks, a pause, and the main valve opened
to provide full heat. The Internet and Google were also a help.
The natural gas supplied to the Western US has a high degree of sulfur which
is corrosive. (Generally natural gas from Oklahoma) It eventually attacks a
coating on the flame sensor that protects it. Sanding the sensor does the
trick for awhile, but you should replace the sensor. You have removed the
protective coating completely. Believe me, they don't cost much and are
easy to replace. You could call your local HVAC repair man and he can
replace it, while there check the whole system over for minor problems. A
penny spent can be a pound of cure.
"RusPC" < email@example.com> wrote in message
This is Turtle.
Zypher is right about the flame sencer having trouble after you sand them to get
it going. I don't know about the coating but I was told they are very smooth and
sulpher, carbon, or burning by-products will catch on the ruff finish of the rod
and have a faster build up to coat it and start the same problem all over again.
Now to price, i'm not much on talking price but usely when I do a repair of the
gas valves or to the furnace i will throw in a free flame sencer in the repairs
if the bill runs over $150.00 or so. I buy them by the dozen on different
I would change it out for a new smooth one to prevent trouble down the road. It
would not hurt a thing to have the furnace cleaned and serviced by a hvac
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