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On the side of the burners opposite the ignitor

Probably the flame sensor is oxidized- clean the sensor with steel wool or small wire brush usually woks.

How pld is the furnace ? Does it have a pilot safety switch, baso, 2h or possibly limit problems also

Valve may have a vacation setting as well

Is the pilot flame present when you put a flame to it ? Usually you depress the pilot knob and release it after a min. Not sure what you mean by not popping up

Clen the flame sensorwith some steel wool or small wire brush

Check your filter too ! Open limit would cause a constant fan as well on most carrier furnaces

I replaced both the gas valve and circuit board this afternoon. Normal amp draw at gas valve, 3 amps, thank for your imput !

I replaced the gas valve yesterday morning, by 8 pm the same problem happened. I noticed the circuit board was not flashing any fault codes and was not locking the furnace out. i.e. the ignitor...