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The pilot light won't stay lit. Replaced the thermocouple (technically a 750mV thermo-generator); still doesn't work. Hmm. I'm assuming this means it's most likely the gas valve that's gone bad.






From what I can tell, this is an ITT General Controls milivolt gas valve, 0.5 psi, 750mV. It has 1/2" mains and a 1/4" pilot line.

I googled what appears to be the part number: B67RA48. I found this site which claims the Robert Shaw 700-502 is a suitible replacement; I found it for $80 at Grainger.






The furnace manufacturer is Homart by Sears, model 133-7240. The serial number is 11-42. Normal input is 40000 BTU, output is 28000 BTU.