WATER IN DRAIN

Check vacuum level during drying phase. It should reach below 1 psi. If it's above 4psi then this alarm will come. Check water pressure, water inlet strainer,  water inlet solenoid valve and finally vantury system. Rarely water lavel detector. 

In general, Water in drain following a drying phase would indicate it is backfilling into drain. Drainline or chamber trap check valve leaking. When unit ceases pulling a vacuum at end of drying phase, advances to air in, water is also being pulled in at the same time. My guess based upon limited information available. If it's actually happening when the machine is exhausting, that is when steam pressure is being evacuated after sterilize, then you have something  a little more complicated going on. 

In general, Water in drain following a drying phase would indicate it is backfilling into drain. Drainline or chamber trap check valve leaking. When unit ceases pulling a vacuum at end of drying phase, advances to air in, water is also being pulled in at the same time. My guess based upon limited information available. If it's actually happening when the machine is exhausting, that is when steam pressure is being evacuated after sterilize, then you have something  a little more complicated going on. 

LOW WATER PRESSURE, REPLACE WATER VALVE.