My K40 sometimes will not pump hot water to the top pump(check valve).
My K40 will not pump hot water to the top or out of the bottom pump. Seems like it lost its prime. Some time the unit will display the descale light which is not true (I descale fairly often like every 2 months). When I push the cup size button nothing happens but after a couple of minutes it sounds like the pump is trying to pump but has no water even when the tank is full. This has happened several times and tipping the unit some seems like it picks up water and works for a few days. Not it is dead and I will see about a backup coffee maker Monday and or donate my 100 plus K cups to someone that has one that works.