Originally Posted by
SuncrestReef
The other things that can cause this is a failing PMUP or a leaky water tube. I've had to replace 2 PMUPs in my ATO reservoir in the past 6 months. Even though they was only in RO/DI water, the PMUPs seized up. Neptune replaced them.
Another time I had this problem I discovered the 1/4" tubing had a bad connection at the siphon break fitting, so the water was just leaking back down into the reservoir instead of going into my sump, so the sump level remained low for too long and the APEX shut off the PMUP and set it to OFF.
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