I have a older armstrong oilpak oil fired furnace and ac combo unit.The oil burner is a beckett af 2.It will start and run fine then after the call for heat is fulfilled a few minutes later the reset button trips.It has a honeywell r8184m1051 primary control.I have have replaced every part on the oil burner and had it checked by several techs but no one can find the problem.Tha ac side works fine.Any ideas on this problem would be greatly appreciated.Thank you