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There may be debris in the diaphrams OR it may have frozen and broken the housing holding them. Either can be checked by removing the pump and taking the head off and seeing what happened. If the housing is broken, it is better to replace the pump. IF there is debris in there, it can be cleaned out and the pump re-installed. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
That would do it for sure........glad it was something simple.