Hi Roger,
I have a 6100.10 that began sounding the alarm. After a thorough cleaning I can get it to run flawlessly, but once shut off and restarted the alarm sounds again. I can only get the alarm to stop sounding by manually applying pressure to and spinning the impeller before closing the housing and powering up. Also I notice the alarm sounds briefly as power is turned off. I opened the controller (7240.27) and it looks clean. No signs of water or fryed electronics. Any suggestions?