When I turn my thermostat to call for heat inducer fan kicks on then a click them ignitor glows another click no flame, does this three times then locks out. I checked everything. Error code blinks once indicating gas flow/gas valve(check) bled the line & I don't know how to check the valve without a meter, or sensor which it can't be that because I'm not getting any fire at all. I hear that u can jump the gas valve from the transformer to see if its getting 24v to open & close, how is this done & how do I know the transformer need replacing & not the valve, & I hear it could be the whole curcit board! I have cleaned taken apart put back everything, ignitor glows limit switches OK jumped all of them separate. Someone help me!

Meters are cheap (less than $20). Pick up one at your local big box home center, read over the instructions, & check voltage across the gas valve terminals just after the second click. You should get +/- 24 volts AC.