Senseo runs through slowly: coffee comes out slowly and brewing takes long

Has your Senseo been running through slower and slower lately, so that a cup takes far longer than it used to, even though coffee does eventually come out? That is something different from a Senseo that only hums without giving water, or a machine that lets too little coffee run into the cup. When it runs through slowly, the flow is being choked off — almost always by a clogged pod holder or by scale in the water lock and the tubing. Below, per cause, what to do about it, from easy to less easy.

First: does this match?

When it runs through slowly, you hear the pump running normally and evenly, but the coffee comes out slowly in a thin trickle; the cup is only full after a long time. Note the difference, because it decides where to look:

Coffee does come, but slowly and it takes a long time — read on below.
The pump hums loudly but nothing comes out — then the system is blocked or there is air in it; see Senseo hums but gives no water.
The pump keeps switching on and off, coffee in bursts — see Senseo stutters while pumping.

1. Clogged pod holder — the most common cause

The water leaves the pod holder through a small hole in the middle. Coffee grounds, oil from the pods and scale gradually build up there, so the hole clogs and the coffee only trickles through slowly. This is by far the most common reason a Senseo slows down.

Take out the pod holder and rinse it thoroughly under a strong stream of warm water.
Carefully clear the central hole, for example with a toothpick or an unfolded paperclip.
For stubborn deposits: soak the pod holder overnight in a solution of water and cleaning vinegar.

More pictures and steps at unclogging the pod holder of your Senseo.

2. Scale build-up in the machine

Even if the pod holder is clean, scale in the boiler and the tubing can slowly choke off the flow. The harder your water, the faster this happens. A machine that has not been descaled for months runs noticeably slower.

Descale the Senseo completely, twice in a row if there are visible deposits.
After that, descale every one to two months, depending on the hardness of your water. This is the maintenance that most effectively prevents slow flow.

3. The water lock in the water tank

At the bottom of the water tank sits the water lock with a small spout through which the water enters the machine. Scale or dirt on that spout, or a sticking float, slows the supply before the water even reaches the pump.

Remove the tank and rinse the water lock and the spout well (no boiling water, or the tank warps).
Check that the float moves up and down freely.
If the supply keeps faltering, the water lock with float can be replaced.

4. Wrong or too finely ground pods

Finally, it can also be the pod. Too finely ground or overly packed pods, or two pods on top of each other, create more resistance and therefore a slower flow. Try an ordinary Senseo pod in a clean pod holder and see whether the picture is normal before you start tinkering with the machine.

Quick order

Start with the easiest: clean the pod holder and clear the central hole, then descale the machine, then check the water lock and the float. In most cases, after a clean pod holder and a descaling, the Senseo runs through as it used to again. You will find the right parts per type number in the parts overview.