I got a Heil PGAA47F1K1 gas furnace that will come on and run for approx. 10 seconds and shut off. It will do this twice and then stay running. I have been working in this business for 13 years and am not a DIYer. I do industrial hvac and a good guy that I know has been having this problem on his furnace. He has had every part changed in this thing and it still does it. I went over the standard questions w/ him and everything seems ok. I was just wondering if anybody has had this problem before. It does have some age on it (approx. 13 yrs. old) and has worked fine until he had the inducer motor changed last year. Any help would be appreciated. Thanx.