If the motor still running, the motor should be fine. 1 X1 P2 K& x* S D0 Y6 qPossible reason:& x6 e9 a9 X( ]! f
Flame sensor, up limit sensor or the pressure differential sensor.4 g9 Q/ G) X- R# \' L
Open the control box, there maybe there is one light flashing tell you what's the promble.