1. Make sure multi-port valve if on "filter" (gotta start with the easy answers)
2. Remove the V-clamp holding the pump housing together and start inspection.
3. remove diffuser to gain access to the impeller.
4. check impeller for clogs (very common if around pine trees)
5. If impeller in free of debris, inspect housing o-ring, diffuser o-ring, drain plug o-ring, and shaft seal (if any one of these parts as failed, this pump will not prime and the filter will have no pressure)
6. If all these things check out, then it is possible you have a suction side plumbing clog. (is the skimmer and main drain protected by screens? if so, a clog is very unlikely)
Note: the most common cause of a loss of "prime" on a pump is a failed shaft seal. It is cheap and easy to replce.
You will not want to remove the impeller or do any serious work on this pump unless you have replacement o-rings for the internals. New o-rings and seals is what allows these pumps to work properly.
Hope this helps
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thanks,
adam
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