lamona is bekos name for howdens,
Bekos don't use a pressure switch to measure water instead they "count" the water in via a flow meter, when they drain they run the pump for a set time period.
If there is a blockage (jammed drain pump, blocked hose) they will not realise and next fill will over flow into the base.
The base has a polystyrene float with microswitch above it which if activated will turn drain pump on (if this is jammed it can over heat and seize)
If you can here the pump running i'd go with blocked waste hose, possibly from rubbish plumbing allowing back feed.
If you cant here here the pump just a faint hum, i'd guess jammed pump, lean machine back (will probably leak some water have a towel ready) some have two screws hold base tray in place other have plastic base with retaining clips round it.
If memory serves me right pump is a bayonet fitting towards the front right hand side. If you suspect hose is blocked by fat put as much of it as you can where you suspect blockage in bowl of very hot water for 5-15 minutes, then try to run a drain with some hot water in machine.