Goodman NG heater. Cycles to the ignitor, hear a click on the circuit board but no flame. Trouble light stays on steady showing no issues. Have replace circuit board, manually checked pressure switch, checked flo switches.

Can you check for 24 volts to the terminals of the gas valve after the click on the circuit board? If you have 24 volts on the gas valve, and no flame, the valve is bad.

Not getting volts after the click

Follow the wires from the gas valve all the way back to the board one of the two wires will have some safety device in series with the valve. Pressure switch or limit, let us know what you find.

Found a switch that was stuck, replaced, now getting volts but still no flame. Replaced gas vlave on unit still same results. Replaced the gas valve prior to the unit, this seems to have corrected the problem.

Try pushing the reset button on the limit switch located at the upper part of the heat manifold. I just had to do the same thing and that was my problem