Diffuser on Multiport Valve Stuck

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I have a Pentair MultiPort (CM-20-3) with a ‘stuck’ diffuser that will not move! I have taken off the top housing and am not able to turn the diffuser. Right now it is in the backwash position so now my pool is unable to filter. It was recommended by Pentair support to try Dawn dishwasher soap to hopefully lubricate and help breakdown the issue. I also got some pro Goof off spray hoping to get this to move and eventually in a state to remove and replace.

Do you have any other suggestions to assist in my issue?

Ask the Pool Guy Changed status to publish October 9, 2024
Unfortunately we don’t have any other tricks for this one. Sounds like it’s time for either a new multiport valve or a new filter.
Ask the Pool Guy Changed status to publish October 9, 2024

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