Gas and Oil Home Heating Furnaces - no pilot on lennox furnace

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Brock
05-14-05, 09:50 AM
hello,
having trouble keeping pilot lit on lennox furnace.
Tried a new thermal couple but it did'nt work

Grady
05-14-05, 07:18 PM
If the pilot flame is blue & envelopes the thermocouple the pilot burner should be fine. The problem could be the gas valve itself. If the pilot is weak, yellow, or white, remove & clean the pilot assembly.
Brock
05-16-05, 10:05 AM
Grady, how would I know if it were the gas valve? are they expensive and could I install it myself? thanks brock

Grady
05-16-05, 07:06 PM
Lennox is notorious for using special parts, only available to Lennox dealers. Do you have a voltmeter capable of reading dc millivolts? Are you sure the gas valve uses a 30 mV thermocouple? This is the normal voltage out of a thermocouple but some valves require a higher voltage.
Brock
05-16-05, 11:08 PM
Grady,
thanks for your replys, no unfortunatly I don't have a volt meter, and no I don't know what kind of thermal couple, so looks like I'll be calling a service tech.
Brock
Grady
05-17-05, 07:52 PM
If you can get me some numbers off of the gas valve (make & model minimum) maybe I can find out some particulars. A bad, new thermocouple is not unheard of.