5 amp fuce keeps blowin on the contol board in my AC furnace, went Itryed to put the AC on

You have a short somewhere ,check the tstat wires make sure the wires arn`t frayed or touching anywhere, especially from the furnace to the outside ac unit, if nothing maybe take the tstat wires loose from the contactor and try again,, could be a shorted out contactor in ac unit,, let us know what you`ve found

Is this the first time you've tried turning it on this year? Sounds like your control board has shorted out. Did you any lightning strikes in your area lately?

you have a short somewhere ,check the tstat wires make sure the wires arn`t frayed or touching anywhere,,especialy from the furnace to the outside ac unit,,if nothing maybe take the tstat wires loose from the contactor and try again,,,,could be a shorted out contactor in ac unit,,,,,let us know what you`ve found

Tnx to all , I fix the problem , it was the transform. Million tnks

I just had the same problem in an older furnace... with a newer AC unit.
Unfortunately, it doesn't have a fuse on the 24 volt supply that runs the
Compressor contactor (relay)... There is not even a circuit board.
So it burned out the 24 volt transformer/fan relay

There was a funny stink, like shellac burning in the basement.. and the same smell
In the access panel where the burners are located...

I replaced the 24 volt supply/relay and then found out that the AC still did not turn on
From the t-stat... in fact when I turned the control to cool, the furnace fan stopped running because the 24 volts was shorted out by the compressor contactor/relay.

I quickly turned off the cooling switch at the t-stat and went outside to look at the contactor...
The compressor started when I depressed the manual switch on the contactor.

I will be replacing the contactor since that is where the short is located.
Yes, the AC unit is a Goodman and the contactor is a GE part.

A fuse in the 24 volt circuit would have saved me $50 for the fan relay power supply.

I bet this never happens to me again, so I thought I would pass it on