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Posted by buffalobill on January 19, 2007, 3:52 am
in buffalo ny: on my 1990 gas boiler, the spark ignitor is also a flame
sensor. on mine i have to see that pilot flame wraps around the
sensor/ignitor/thermocouple properly after the ignition spark and
during the main burner on. and exactly according to the specifications
of the manufacturer. i keep my manual by the boiler.
if there is a good flame then i replace the ignitor/sensor.
if i have insufficient flame, i clean out or replace the pilot
assembly.
see:
http://www.arnoldservice.com/Troubleshooting_Heating_Problems.htm
and:
http://toad.net/~jsmeenen/gasvalve.html
frank1711@aol.com wrote:
> I have a natural gas furnace that won't stay on. The pilot is lit and
> the burners come on, a few seconds later the fan starts and runs for no
> more than a minute and then it stops. The burners sometimes go out
> before the fan stops or the fan never comes on at all. I can turn the
> fan on at the control and have it run with out a problem, but that is
> just circulating the air and not heating it. I think the fan is
> controlled by it's own thermostat. Once the thermostat in the house
> starts the burners a thermostat in the furnace turns on the fan when it
> reaches a certain temp to blow the warm air through the ducts. Does
> this sound right? Could this be where my problem lies? Could it be as
> simple as a loose wire to that particular thermostat? We had a service
> guy come and look at it and tell it us it's just old & inefficient and
> it'll be about a grand to replace. I had the Gas Company out last week
> to replace my meter with a higher flow model due to a recent swimming
> pool installation. He checked all our gas appliances after the
> replacement and everything including the furnace worked fine. The
> furnace started having trouble over a week later, I doubt the problem
> was caused or triggered by anything he did since the furnace worked
> fine for over a week. Help a cold Californian please, yes it gets cold
> in CA. I'm in SoCal, high desert area, last weekend we had single digit
> temps (rare). Thank God it worked then.
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