When I turn my furnace on , my exhaust blower comes on but my ignator will not turn on. The ignator is good and I got a new board.

Do you have 120 volts to the ignitor?

No, it doesn't have 120 volts to the ignitor.

Does the control board blink any sort of code? If so, find the key to that code (often inside the blower compartment door) & let us know what it says.

It doesn't blink , and I got a new board.

It sounds like the pressure switch is not closing. If there are two terminals on the switch, connect your volt meter across them & create a call for heat. Before the exhaust blower starts you should get 24 volts AC. Almost as soon as the exhaust blower comes on, the reading should drop to zero.

Ima try it out (:

It has 24v before the blower starts and when the blower starts it stay at 24v

For some reason the switch is not closing. The next step is to VERY gently suck on the hose going to the pressure switch & listen for a click. If you hear the click, you know the switch works. Remove the hose from the exhaust blower & clean the fitting with a piece of wire or drill bit (not in a drill). Reassemble, try it, & let me know what happens.

Yes the pressure switch clicks but the other side where the hose goes into the blower it doesn't suck air.

Did you try to clean the nipple where the hose connects to the venter?

Sounds like the plenum port is clogged. Clean it out with a coat hanger or sized drill bit.