If the motor still running, the motor should be fine. ! y% _* c7 n) R) {3 X# J# c7 lPossible reason:3 x: ^7 ?% i! J; H; X$ r& h" n% C. O
Flame sensor, up limit sensor or the pressure differential sensor. / D5 n0 v2 f' ^: i. {Open the control box, there maybe there is one light flashing tell you what's the promble.