Sealing Machine

Could be an number number of things, what have you checked so far to narrow down the large list of possible causes?

Have checked the connecting cables to the heating element of the sealer it's intact, as I checked I do not know where seems to be making partial contact as a red led on a panel inside the machine which normally comes on when it's sealing did come on and it sealed about 3 kegs and then stop sealing

Some characters are just really good at breaking the seal of a keg.

_{From the Wikipedia page}.

Is it like this?

That seals with plastic by induction heating?

If so, your start button on the top may be going bad...

Or is it more like this?

A little more info...

if it’s a thermal heat seal that melts plastic as a seal... could be your heater platen are failing.

test them

The <...cause...> is that it hasn't been maintained or repaired properly.

The remedy is in the Operation and Maintenance Manual for the equipment, either in the text or among the contact phone numbers listed therein for the manufacturer, and applying (an) appropriately-skilled Technician(s) to the equipment.

Is it a vacuum sealer? If so, maybe the motor crapped out, or maybe there's a leak in the hose.

Again, Can you please give more information...

now you say a 1 liter keg... Please elaborate with the machine, what you are sealing and what are you trying to accomplish.

It seals by induction.two flexible wires covered with white insulation from a small 30tcs transformer runs to set of small iron, winded round it, produces heat from the other side of the sealer

Any invitation to call the manufacturer from here will be declined.

One liter is just a little more than two pints. At best that's a tiny growler, not a keg of beer. A torpedo keg is 1/6 of a barrel so it holds 19.5 liters of beer.

https://brewingindustryguide.com/no-return-the-practice-of-one-way-kegs/

Okay, what size is that little one? I read the article and I did not see any volumes for these one way kegs identified.

KeyKegs come in three sizes (10-, 20- and 30-litres). I'm not saying this is what the OP is talking about, but it is possible that he could have some smaller... more probably the use of the term 'keg' has a different meaning for the OP in colloquial use...Maybe he could take a picture of the device and post it...(this is clearly too much to hope for)