Heater wont ignite

Question

Heater goes through it cycle but ignitor wont glow. Replaced
ignitor/pilot assembly.no effect. pulled plug on ignitor and tested for
power to ignitor on gas valve pins. I can get 25 volts on one pin if I
test to ground. If I test to the two pins I dont get power. I dont have
the manual for the codes the valve is flashing. If you know whats wrong
or can send the codes it would be appreciated. send to
[e-mail]. Thanks.