If the motor still running, the motor should be fine. - Q# v" o& U i1 WPossible reason: % s0 C, b" s, O2 a R# _% ]& d9 YFlame sensor, up limit sensor or the pressure differential sensor. ! x% B8 B! v3 T% i7 p1 Z2 tOpen the control box, there maybe there is one light flashing tell you what's the promble.