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Showing results for tags 'CPR box refuses to start'.
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I come home from work to find my sump almost empty and my main circulation pump mainly sucking air. I initially think I forgot to top it off (no ATO), but after adding the first gallon and going back for the second, I realize it's already sucking air again because nothing is coming back down - there's no flow through the overflow. I've checked the tubing, reamed out and flushed the siphon port, cleaned the aspirator pump (Rio 800 RVT), and done about everything else I can think of. Even with lots of bubbles coming through the aspirator (demonstrating suction does exist), the "out" side of the overflow box doesn't start flowing. I'm thinking that perhaps the interior inverted "U" is plugged up, but can't think of a way to clean it without breaking something (flex brushes, etc just don't seem to go in). Any thoughts on a solutions (or even alternative causes)?
