Foot pedal doesn't work after replacing batteries

Likely the foot control was dropped and the contact points are damaged. It is tricky to replace these, recommended Bernina Tech look at it

I would suggest you replace the foot pedal speed control.

What is the machine make and model?

OL may stand for overload and depending on the make and model it may be due to a number of different causes.

The foot control has nothing to do with the battery. You need to take your machine and foot control to a Pfaff service center.

you can either have that foot pedal checked or buy a new one

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Yep same thing .....the thing is possessed started running by itself when I was at the iron. Dealer said never heard of such a thing and acted like it was me. Also will not stop sewing when take foot off pedal. Dealer charged me $95 to clean machine and said nothing wrong with foot pedal. Ugh. Has anyone replaced foot pedal and found the problem to stop properly?

well if the foot pedal isn't working, you can either replace it with a new one or take the machine to a sewing machine repair shop & let them check the foot pedal & see if it's fixable

Taking the pedal in alone didn't let them diagnose the whole problem and they were wrong to try. You needed to take the whole machine in. The prong on the peddle AND the prong on the machine sound like they both got messed up.

I hate to say this, but I'd take the machine in, to another place if there is one, along with the foot pedal. Tell them exactly what is happening and what you've already done. The connection sounds like it's bad at the machine, as well. That's just from a purely electrical repair standpoint and doesn't take a sewing machine repair person to diagnose. But a sewing machine repair person may be needed to deal with the specific wiring in this type of electronic/computerized machine to properly wire everything back to the circuit board(s) once the connector is replaced.

It most likely is your foot pedal. Unplug your foot pedal and start the machine without it. If it works properly without the foot pedal plugged in then your foot pedal needs repaired or replaced. This worked for us with the NX400 machine and I am sure the NX450 is closely similar. Don't bother to buy a Manual if you didn't already get one with the machine. A Service manual and parts manual is best; But just so you know they don't show the error codes unless you are a qualified and authorized repair person for the machines. I got my info from the repair man where my wife buys and repairs her machines. I am an electronic technician and mechanic so I understand how this system works. I will be repairing my wife's machines from now on.

my pfaff sewing machine footpedal sticks