I have a confort glow vent free gas heater that is installed to natural gas that was working fine this morning and now is putting off a terrible odor. Does not smell like gas but like carbon. What can I do to fix problem?
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Billy here's a link to A & B Sales. They have what you're looking for. Whether your heater is Natural Gas or Propane makes no difference when it comes to thermocouples.However the length of the tubing does when it's a wall or stand type vent-free heater.
The plaque may be out of place or may need replacing, depending on the age of the heater. Also, although you have flame, make sure you have flame at that plaque that's equal to the other plaques. If you don't the burner may simply need cleaning.
According to the Comfort Glow Website, this is a Natural Gas unit. If you use propane you will need
a minumum 100# LP Cylinder and a pressure regulator. I have a Comfort Glow unit and went through the same process.
If you have it hooked up to a 30lb cylinder without a regulator I would think that if you purged the gas line
of air you should be able to light the pilot.
On a new unit you can expect to push the spark ignitor button at least a dozen times while holding
down the gas valve button.
the pilot light is operated off a millivolt generator. that is the small tube directly in the pilot flame. its purpose is to generate a small dc current which is connected to the pilot valve inside the main valve. setting the control to pilot opens just the pilot gas supply. when operating normally the millivolt generator keeps a small electromagnet pulled in that keeps the pilot gas supply open. if it don't work the pilot gas supply valve closes. replace the thermocouple.
What you are experiencing is common if the plaques are either out of alignment or the burner is dirty. I know you said you cleaned it with low pressure air, but you need at least 120 PS. of air to clean the burner and plaques as per the owners manual.