All ActivityMost RecentMost LikesSolutionsRe: SMALL AIR PUMP MAKING NOISE AND GOING BADthe air pump fills a small tank with air so when your auto air leveling needs air it always has some no mater how long its been sitting. if its running a lot you either have a leak or the pressure switch is bad and it just runs and runs trying to fill a already full tank. if the pump is shot I don't think it is serviceable. could take it apart and see if there is any thing wrong with it. if you want to shut it off there is a fuse for it in the side compartment.Re: Aladden systemhey thanks for the info. I can probably figure this out without calling Monaco now. I did clean all 3 sensors, that's how I got the black and grey tanks to read right.Re: Aladden systemthanks for all the replies. I will call Monaco and see if I can get the 4 digit code to get in to the monitor and to calibrate the sensors.Aladden systemwas working on my tank sensors today on my 2007 HR navigator, got the black and gray tank to read right, but the fresh water sensor will only read 25%.so I switched the gray water sensor with the fresh water sensor and same thing only 25%. Is there a way to calibrate the sensors? or could it be a bad board? or something else? thanks for the help. by the way it's a Aladden sys.