W/pool ADP4501/5 Home › Forums › Trade Technical & Spare Parts Forums › Trade Technical Enquiries › W/pool ADP4501/5 This topic has 1 reply, 2 voices, and was last updated 17 years, 6 months ago by reaper. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts October 9, 2008 at 7:52 am #40082 reaperParticipant 4 flashes even though the machine is empty of water.What senses that the d/w hasnt emptied?I suspect something blocked or the main board. October 9, 2008 at 9:19 am #264693 bzz67Participant Re: W/pool ADP4501/5 pressure switch, on side of sump. rubber diaphram probably clogged up. twist fit, easy to remove and take apart Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In