Whirlpool ADP4501/5 Home › Forums › Trade Technical & Spare Parts Forums › Trade Technical Enquiries › Whirlpool ADP4501/5 This topic has 2 replies, 2 voices, and was last updated 15 years, 2 months ago by geoff1. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts January 19, 2011 at 5:35 pm #60332 geoff1Participant Hi Cannot get this dishwasher to stop draining and eventualy coming up with the start light flashing 4 times. 😥 Have cleaned the float switch and its housing. Microswitch is working ok. During the mant times of trying today twice it started to fill but if I stop it and start again it will just drain. 😕 Any ideas please Geoff January 19, 2011 at 5:50 pm #341830 chezzaParticipant Re: Whirlpool ADP4501/5 I would check the black grid in the filter sump ( level switch ) .boiling water and a toothbrush , then flush through a few times . January 19, 2011 at 5:54 pm #341831 geoff1Participant Re: Whirlpool ADP4501/5 Hi Have tried this even to the extent that I have had the pressure switch removed and cleaned. while out check operation including microswitch Geoff Author Posts Viewing 3 posts - 1 through 3 (of 3 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In