Hi there, hope members are able to give me some advise on my water/pump issue.
Background: we build a 3 storey house in Chiang Mai in 2015, with a 2,000l underground water tank. Highest point is the solar water heating system at about 10m above ground (roof system).
Connected that tank to a Grundfos pump (CMB3) and when it works it works well and is very quiet and with nice water pressure. Unfortunately, it doesn't work properly all the time and water pressure drops frequently. When that happens I have to manually fill water into the pipe at the pump and if I am lucky, pump kicks in after a while. Pump should be self priming, but somehow it doesn't and the water pressure goes down, pump doesn't switch off and runs for hours- usually when we are not at home -. Water tank is always full, our moo baan water system works well and we never have water shortage.
Anyone out there who has similar issues and hopefully, a solution? A real plumber maybe? Seems like most people here can glue pipes together but have no idea what they are doing...?!
tnx Horst