Hello! This is my first time on this site. I have a goodman 56,000BTU furnace heating the upstairs to my home. Thermostat set to 85, inducer draft motor comes on, hot surface ignitor comes on, gas valve clicks,hot surface ignitor goes off and no flame, then blower motor starts. Cleaned flame sensor, took contacts off gas valve leads,put ends of voltmeter into contacts let furnace start it's cycle when gas valve clicked, I got 24volts then lost 24volts. I forgot to mention through all this no flashing led codes, just red non-flashing light indicating that everything is OK. I believe it's the gas valve,am I right?

First verify the gas pressure is normal
And then that the valve is in the on position,
If those are OK then I would suspect the gas
Control to be at fault