Why does no brewed coffee comes out? bypass preground does work

If the water pressure coming out of the steam/hot water arm is fine, then the issue is likely with the brew unit or the grinder. Here are a few things you can check:

1. Clean the brew unit: A dirty or clogged brew unit can slow down the flow of water. Remove the brew unit and clean it thoroughly, making sure to remove any coffee residue or buildup.
2. Check the grinder: A dull or clogged grinder can also slow down the flow of water. Make sure the grinder is set to the appropriate setting for your coffee beans and check that the grinder is not clogged.
3. Check the water flow meter: The water flow meter measures the amount of water flowing through the machine. If it is clogged or damaged, it can affect the flow of water. Try cleaning the water flow meter with a soft-bristled brush and see if that helps.
4. Check the water filter: If your machine has a water filter, it may be clogged and affecting the flow of water. Replace the filter if necessary.

If none of these solutions help, it may be a more serious issue and you may need to bring your machine to a professional for repair.

spout clogged clean with vinegar

I think the blockage might be at the brew unit, remove unit and check the screen under the red o-ring, connected to that is the chute that leads to the espresso spout. That tube might be blocked, there are 2 screws holding that piece together, be careful when you remove them do not lose the spring and ball in the fitting. Clean tube and reassemble.

This is hard to picture. The only way water can come out the brew spout is if the brewing mechanism inside in the position to make coffee. The only way to get that mechanism into that position is to either select one of the three coffee buttons (you'd hear the grinder run, then you'd hear the motor putting the brew mechanism into place and then the pump start and water would then come out the brew spout. OR to select preground coffee and then select one of the three coffee sizes - in that case you wouldn't hear the grinder but you'd still hear the motor turn the brew mechanism into brewing position and then start the pump.
When you simply select hot water and then open the steam valve - I can't imagine any possible way for water to come out the brew spout.
Now if you mean that you don't see any water come out but water is leaking inside the cabinet and ending up in the drip tray - then that would mean a leak inside the machine. It could be the valve that the brew group locks into when it goes into brew position (you see this valve in a little recess behind the brew mechanism when you take the brew group out to clean it). Or it could be a leaking steam valve or hose inside.
You might try getting a flashlight and a cleaning brush - take out the brew mechanism and then clean around that little nozzle/valve that is in the recess just the left of center behind where the brew mechanism was. That valve should shut when you are not in brew position and not allow any water out - but it may be gummed up with coffee grounds.
If you are feeling brave - you would need a deep socket and a lot of patience with a small breaker bar (a ratchet head is too big to fit in there) and you can remove that nozzle/valve and then clean it or replace it. But it is very slow going to remove it (there must be some special tool they use at the factory). I had just the right size deep socket (like what you'd use for a spark plug in a car) but there wasn't room for a ratchet so I had to use a small breaker bar and I could only turn the valve about 1/4 turn at a time then I'd have to reposition the socket to do another 1/4 turn. It took 5-10 minutes to remove it - then it was easy to clean. I think you could clean it in place with a stiff bristle brush and some q-tips.
I don't know if that valve is the problem - but that's the only thing I can think of that would have your hot water and steam running into your drip tray instead of out the steam wand.

After grinding did you hear the brew group goes up and pump start? If you hear the pump start and stopped, itis blockage in the brewunit metal screen. Just needs cleaning.
If you don't hear the pump starting, the problem is with the faulty micro switch inside the gearbox , that is behind the plate of brewunit.(service center job)

Could be the pump not providing enough pressure to force the water through the coffee. When using beans or preground, can you still hear the pump function?

Something is wrong on the coffee cycle side of the machine. Check the brew unit screens and and try doing a preground cycle with out inserting coffee. IF water comes out, I would looking into your grinder a little bit and try increasing the grinder size.

Espresso parts and service
www.cerinicoffee.com

First step, increase the grinder size. Note: only change grinder setting while the grinder is spinning. If that does not work, look into cleaning your brew group screens. The machine should have came with a key to remove the screen. If your machine as a preground option try making a preground coffee without inserting coffee to see if only water will come out. If water comes out then you know its your grinder. Usually too small of grinder sizes will stop water flow.

If you need a brew group key:
http://cerinicoffee.com/Saeco_Brew_Group_key.asp

Espresso machine Cleaning supplies:
http://cerinicoffee.com/Coffee_cleaning_supplies.asp

The grind may be too fine. The Brew unit is plugged and needs service. The spout joining the boiler to the brew unit is broken. The unit may be plugged with scale.