I am working on the package unit but I can not find a brand name on this unit. By the way, call for heat nothing is on. I see 24V to a gas valve but the spark ignition does not get the 24V so it does not work.. What should I check on this case please..

If you have 24 volts at the spark control module and no spark its bad or you have a grounded spark wire or electrode.

I don't have 24V at the spark control module. It is 2 wires spark black module. I replaced a new one but It did not work. Please help me out.