My ge smartwater was running very slow ao i changed all three filters, now it runs normally for a couple of seconds then it just trickels out.

Dec 1999
Reliance is AO Smith
First letter of serial number is month, and next two digits are year.
http://waterheatertimer.org/pdf/WaterHeaterSerialNumberDecoder.pdf

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The system is most likely running to the drain. Bypass the water softener to see if the whining stops. If it is running to the drain it is either stuck in backwash cycle or the interior seals are bad and need to be replaced. If it is stuck in backwash the drive motor is probably bad and needs to be replaced.
Here is a link to GE website for manual
http://genet.geappliances.com/DocSearch/Dispatcher
RJ

Many times fines from these filters become dislodged and plug up the filter housing. If you have the bypass plug for the filter, install it and run a couple gallons of water through fridge to flush the system completely. The install the filter again. Make sure none of the water lines feeding fridge are pinched or kinked and valve is on all the way.
RJ

This is proabably not the case but I have seen it happen, Have you checked the outlet side of the filter to make sure it was drilled when it was made. Thank you

If you were simply changing the filter, then I would pull the new cartridge back off and inspect the o-rings. It's possible that one got bunched on the install and is blocking the inlet/outlet of the water. Other wise if you had to turn off the water any where to change the filter, check the valve that the water runs through to see if it is turned on all the way.

not big job replace valve

it should just unscrew

Yes this is air lock. You will need to bleed the system. Loosen the nut that is running to the machine not to the valve and let the water squirt out. If that doesnt do it then you will need to remove it all the way and allow water to run trough it for 15 seconds then you will be ok. Other problem is that you could have it on upside down

I solved the problem! The system's manifold (the plastic base you put the filter in) has small black conical shape button. When you tight the filter in, one of the two small triangle-shaped cams (located close to the filter's central hole) pushes the manifold's button, and this opens the water flow. The problem is that the cams are too low and do not push the button all the way in. Take a pliers and squeeze (not too much!) the cams, so they will raise a little: it will be enough to push the button to open the flow completely.