First check all the wiring from the pump to the CCU. Probably not the problem, but its a free fix.
I would then try replacing the pump. If that does not fix things, the CCU is next. Yes, I know this sounds like trying parts to see what fixes it, but that is what is being done with these units.
If you buy the parts from this site and they do not fix the problem you can return them, see the Returns Policy for details and conditions.
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