Senseo maker is just shooting hot water but not the coffee

SOURCE: Replacement seals for Senseo Coffee machine

If no good,
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: stuck senseo maker

The locks shut due to a pressure build up in the pod chamber usually caused by a blocked filter in the centre of the pod holder.

The only way to open the unit is to releive the pressure. The pressure will normally reduce over time, the duration being determined by the pressure build up, condition of pod seals and the strength of the blockage.

A quick DIY solution: (small cable tie and screwdriver required)
Un plug the unit from the mains:
Remove the water container and prise open the rear snap fit panel of the unit carefully using a screwdriver to expose the internal workings, the overflow pipe at the top of the cover must be disconnected to gain enough access to work on the unit.
.The small metal boiler in the centre of the unit is used to heat the water for the machine, if the boiler is still hot allow it to cool down sufficiently for work to commence.
The exit pipe at the top of the boiler feeds directly to the pod chamber, if you squeeze this pipe you will feel that it is under pressure. Cut the cable tie connecting the pipe to the boiler (be careful, dont cut the pipe) and remove the pipe to release the pressure, a small ammount of water will be released during the procedure. The lid should open.
Reconnect the pipe to the boiler replace the cable tie, refit the rear cover making sure to push the overflow pipe back on before you snap the cover shut.
Remove the pod holder and clear the blockage blow through the holder in the reverse direction to ensure the filter is clear.
Replace the pod holder and pour a small amount of water on to it. The water should exit through the delivery spouts if the path is clear.
JOB Done.

SOURCE: how do you take apart a senseo coffee maker

2 words! With difficulty

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: 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.