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QUESTION:I have a Heil furnace that has a problem. I was hoping one of the
gurus here could help me out.
The problem is the igniter sparks and lights the pilot and then the
pilot goes out right away. I spoke w/ a friend who is a HVAC tech and
he told me that it was most likely the flame sensor. Ok so I took the
unit apart and removed the igniter assy looking for a flame sensor. I
couldn't find one. The closest I can figure is that the igniter and
flame sensor are one and the same.
After I took the whole assembly out and cleaned it up per my friend's
instructions, it still didn't work. I used a fine emery cloth and
followed up by spraying the assy w/ Zep Elec contact cleaner to make
sure I flushed away any particles I may have created by sanding.
Tonight I turned the igniter 90 degrees in it's mount and voila, the
pilot stayed on for more than a second and the burners fired up.
The igniter unit has what appears to be a high tension lead going from
the end of it to a box made by Honeywell. There is also a grey ground
wire coming from the unit's mounting bracket that goes to the "ground"
terminal on the same box. That doesn't really make sense as the
furnace should be grounded anyway but that may there just for
redundancy.
The furnace was installed in 1992 or 1993. I don't know the exact
model of the furnace but in doing some research, I found a picture of
the igniter assy online. It can be viewed here:
http://www.expertappliance.com/heil-heating.html
It is about 1/3 of the way down the page and is called a "Pilot
Igniter Sensor"
The only way I can figure is that the Honeywell box sends out a high
voltage to the unit in order to fire the spark, and then waits for a
signal coming back on the same line telling the microprocessor that
the flame is present and it is okay to fire the secondary part of the
gas valve. The valve has three wires going to it and I figure that it
must be a two stage valve.
Am I correct so far or am I going down the wrong path? If any of you
guys have any experience with this type of assembly, I was wondering
if it needs a good ground and perhaps turning it inside it's mount
cleaned it up enough in order to fire the burners. It's either that
or I am going to need to replace the whole unit.
ANSWER: Sure, where you located? You pay travel? This goes to show you didn't pay attention when you removed it!
What else may you have screwed up in the process? Thanks for the link, I'll now go raise my prices 400%!
Can I make that kind of profit for installing the new furnace? Whole unit for an ignition problem? Sure, where do I bring the new one?
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