Fan runs constently Furnace won't fire
 

The furnace will fire if I turn the switch off on the side of the furnace for even 10 seconds and then turn it back on then the gas valve opens and the furnace gets. hot. But after one cycle the gas valve does not re open for another cycle unless I cut and then restore the power to the unit.

Fan runs all the time
induction motor runs all the time.
pilot is lit
??
Anyone got any ideas?
Carrier
model number 58 GFA 130- 16

look for a code from the circuit board but id try cleaning the flame sensor try using the search as ive just written about doing that