Take out the drip tray, take out the dregs container, open the side door, press the button and pull the brew unit out. On the front of it is a small pippe which should have a rubber o-ring on it. This must mate with the coffee dispenser unit which is the two holes the coffee normally comes out of. Check that the dispenser is in the right place. Behind where the coffee comes out is a knurled knob that you unscrew to remove and clean the dispenser. Undo it, remove the dispenser and clean it. Replace it, ensuring that it is pushed right back in the slot when you tighten the knob (don't tighten "too" hard). Is the water clean or "coffee" that comes out? If it is clean, it is likely the o-rings that seal the small tube from the boiler to the brew unit. There is also a nozzle on the boiler outlet that has two o-rings, but if those need changing you need some patience and skill to replace them.
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Check the end of the steam nozzle, make sure it is not blocked. If not then with the knob open for hot water cycle push in on the knob if that works then the tap rod assemble or the steam valve needs to be replaced.
If you haven't cleaned the brew group, or decalcified the unit I would start there. This is something I do every 4 to 6 months (or anytime I notice the flow of coffee to start to slow down). This normally restores the flow to the original flow level. If you have already done these things you may want to give Saeco support a call and see what they suggest. They are extremely helpful, although very difficult to get on the phone as the phone system they use is horrible and hangs up after you hold more than a certain amount of time.
If you could brewer coffee or get hot water out of the steam wand then it could be the one way valve on the bottom of the water tank. If you are running the pump output into a glass then it is probably scaled up in the boiler.
Switch off the machine.
Pour a descaling product into the water tank.
Switch the machine on to the programming mode(see below). Place a large container under the steam/hot water dispensing tube and open the steam/hot water knob slowly, turning it counterclockwise.
Turn on the machine by pressing the main switch and let the descaling product flow out of the dispensing tube for approx. 1 min.
Close the knob again.
Turn off the machine with the main switch and let the solution take effect for approx. 5 minutes.
Repeat this procedure two or three times, to allow all of the descaling product in the water tank to flow out of the dispensing tube.
As soon as descaling has been carried out, rinse the tank thoroughly and fill it with fresh water.
Switch on the machine and let fresh water (approx. 2 l) flow out of the steam/hot water dispensing tube in order to rinse away residue.
The machine is now ready for operation.
When the machine is on, the warning light switches off automatically, by pressing the steam selection button for at least 5 seconds.
To enter the programming mode, turn the machine
off with the main switch.
Press steam , espresso coffee and the
main switch at the same time.