My AUTOCHLOR RP36t chlorinator has been beeping with No water flow light on intermittently for more than 2 weeks (the chlorinate output indicators goes off when it is beeping). I cleaned cells with dilute acid water weekly and I also have cleaned skimmer basket/strainer basket. The hardest part to fix this error is the beeping comes on and off intermittently. I have called pool shop technician came to check twice once it started beeping. But both time it resumed working properly before the arrival of the technician. Can anyone help to advise which part of the pool system goes wrong ? Thanks.