no pilot light.

[adrenalic]

Hi
I have a Bryant (BDP) plus 90 model 398A gas furnace. I woke up this morning and the house was cold. I tried to restart the furnace, the motor starts but NO ticking sound for the pilot light and so the pilot light doesn't come on. the motor keeps on running and no pilot light . I replaced the circuit board with a new one last year. Do you think it is the spark ignitor not working?. how do I test it. could I just replace it without testing and hope it was the problem. anything I need to worry about when I replace it? I know it has " high voltage" written on it. so, I will teurn off the electric switch before I start. Thanx for any help.

[jnaas2]

Most furnances go thru a purge cycle before they start the lighting sequence. If the induced draft motor isnt working right or something is blocking the intake to the furnance you wont go into the lighting stage. And a blocked condensate drain will cause them to malfunction too

[adrenalic]

OK, I removed the black cylinder trap after disconnecting 2 hoses and cleaned it up very well, I reconnected the hoses . nothing new happened, then I removed the front cover of the burner box and restarted the furnace. the inducer motor started, I heard the ticking sound and the pilot light came on, I covered the burner box and the flames ignited and I had heat blowing.....but only for a minute or two and then the flames went out ,also the pilot light, but the inducer motor kept running. I read in one post with a similar problem that it might have to do with the intake pipe blockage. where is the intake pipe and how do I clean it?. also, after reconnecting the black trap cylinder, should I have filled it with water first???

[adrenalic]

Problem solved.
intake pipe was clogged with debris. cleaned it up.
furnace running like a charm.