Sticky Heating Manifold Valves?

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Chris Arneson

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Big Horn, WY
i have a hydronic radiant in-floor heating system. It’s actually partially heated by solar but that’s probably not relevant here. Several zones are not heating although the electric actuators show ON. I believe I must have some sticky valves but can’t find any maintenance info on them. The brand is FAR and I gather that’s it’s european and obscure. Please note that I have some unused zones so I could potentially use one as a spare.

Here’s the whole manifold:


The 2nd photo shows a zone working beautifully. The third photo shows a valve not working. The plunger is sticking out far less in this one.

Do I need to order new valve inserts or can they be cleaned and lubricated somehow? Do I need to drain the entire system to do this? Are there any big risks I need to know about? Thanks so much.
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