Fabric softner does not empyt from its tray

USUAL PROBLEM THERE IS ASIPHON TUBE IN THIS TRAY AND THE THEORY IS SIMPLE IN FACT :
1- WE MUST TO RECEIVE ENOUGH WATER COME TO THIS TRAY TO REACH CERTAIN LEVEL TO DRAIN THE SOFTENER
2- AND THE WATER WILL COME ONLY AT LAST STAGE RINSE
3- THE SIPHON TUBE MUST BE IN RIGHT POSITION FIT
4-UNDER THE SIPHON TUBE THERE IS A PIPE MUST BE CLEAR OF CLOGING MATERIALS
5- SO THE REMEDY WILL RELATE TO EVERY STEP