On light will not stop blinking on my Senseo coffee machine

SOURCE: The indicator light continues to blink rapidly

you are correct in thinking the problem is caused by the valve. Use a magnet to connect to the valve from the outside of the machine, slide the magnet very slowly upwards along the water level, the rapid flashing should stop and the water should begin to heat, if not try again as you have not connected the valve to the magnet

SOURCE: Senseo coffee maker

Having dismantled and inspected several of this "strange machines" my conclusion is the following:

There is an oscillating-piston pump inside with in- and outlet valve.
It is energized by a microprocessor controlled circuit for a working time depending on the button selected (1 or 2 cups). The pressure and flow are nearly constant for a perfect working pump.
The pod holder restricts the thruput by its central hole. (E.g. you get now an extra pod-holder with a very small hole for expresso type)

So if you don't get enough coffee it may be that
1) the duty-cycle (timing) of the pump has changed.(not often occurring) no repair, you have to undergo electronic and programming work
2) the pump lost efficiency (cylinder of the pump clogged, piston not working with complete stroke, spring force fadening or just one of the 2 valves leaking) ca be "repaired" after dismantling machine ,extracting pump and taking it apart, success not garanteed - grinding valves is already time spending
so my principle before starting this work is to run the machine without the coffee pod to check the water output, use a new holder with clean central hole, if this works it will be nr.
3) the central hole of the holder is clogged, may be not by limestone, but dried coffee extract (grease) clean with needle or even better with micro-drill

SOURCE: one coffee cup button switch not wotking properly after 6 months

Call senseo at 866-4-736-736 866-4-Senseo and describe the problem.
if you have purchased or received it as a gift less than two years ago they will send a new one FREE.

SOURCE: My senseo coffeemaker has stopped pumping hot

When was the last time you clean it with vinegar? Run vinegar through it and you will see hard water scales that were built on the heater. Coffee makers should be clean out every month then with 2 rinse cycles after that.

SOURCE: philips senseo coffee is watery

It may be the pod holder,there is a seal under the black disc at the bottom of the holder,the water will bypass the coffee under pressure,travel to the outside of the pod holder and exit the centre where the filter mesh is,if there is no foam also this is a sure sign,fill the empty pod holder with water and see how quick the water drips,I had this same issue and bought a new pod holder and compared,should be no more than 1 drop a second,you can knock the plastic out and re seat the O ring or buy a new holder,hope this is of use to you