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Hello. I have a taco 007f5 taco pump that is used for my dhw. It seems to be prone to getting air locked. Two weeks ago I cleaned my wye strainers so I just down the system. I soon fired it back and bled the air by forcing some fresh water into the system and draining out of another valve at the same time. Now today the pump has air locked twice and as soon as I crack open a valve and release air/pressure it starts working again. Any ideas?