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Following up my last post. For sure it is the pump - I need 3 of them repaired or replaced. Upon opening up the pump (hard twist) I see that the spindle, made of a delicate pink ceramic material, is broken. This causes the impeller to fail, and thus the heat is not pumped away from the unit and the E5 error triggers the shutdown. So, I really just need 3 new spindles! Can anyone advise on this? Any repro spindles out there? Seems like it could be such a simple fix - replace the spindle and reassemble.