If the motor still running, the motor should be fine., D F' l! [% c- L0 o/ p: z; N8 O$ F
Possible reason:9 ^% y0 m- i' b$ p
Flame sensor, up limit sensor or the pressure differential sensor.! O' R- r0 I, s" v( t7 b$ O+ z/ A
Open the control box, there maybe there is one light flashing tell you what's the promble.