Water dripping out the waste pipe when the pump is running indicates a bad gasket in the multi-port valve if that's what you have. If water is coming out, then air can get back in when the pump is off and let the system drain down. The crack in the pump housing could also be the source of an air leak. If it's on the suction side you can temporarily seal it with silicone seal. Probably an epoxy of some sort can be used for a permanent fix.
Hope this helps.
Al
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