Hayward S166T Pool Filter System w1 HP PumpS166T92S () Logo

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Posted on Aug 07, 2011
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I have a Hayward S166T sand filter. I changed out the internal diverter valve (it had been leaking out the backwash line). Now, it is leaking around the diverter valve handle. What do I do / change now?

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  • Master 990 Answers
  • Posted on Aug 15, 2011
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Joined: Aug 04, 2009
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Your best bet is to replace the whole top assembly as the plastic top probally is etched and bad.

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0helpful
1answer

Just had the spider gasket replaced and now water is "gushing" out the handle

Hi Shari,
I see two possibilities. 1. The diverter shaft o-rings are not sized correctly (or missing). 2. When valve handle was reinstalled it was not oriented properly with the diverter position in valve body.
Hope this helps you.
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I have a hayward s166t filter, guage reads 0 and sight glass water does not swirl when backwashed

Does it show pressure when in "Filter" mode?

If not, then your pump is either not primed, Impeller is plugged, or there is not enough water in the pool, you are sucking air.
1helpful
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My hayward s166t filter is missing the index for the control valve i.e. backwash, rinse, etc.... can you please help me? thanks steve alderfer

Go to the following site... http://www.haywardnet.com/inground/products/manuals.cfm#FiltersSand

Scroll down to the Valves under General Pool/Spa Equipment. Download each of the PDF Dcouments for Valves and find the one that closely matches your design. It will show the position of the different settings.
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1answer

Water running through the backwash valve when in filter position

Open the valve and replace the "wagon wheel" looking gasket that sits below the diverter.
0helpful
1answer

What do i do with the waste line port on the multiport valve on a hayward filter. do i attach a fitting to stop air

No. That port is there for when you backwash or pump to waste. You normally put a hose adapter there that allows for a collapsable backwash line to be attached when ready to backwash the filter. If it is leaking water there when the valve is set to something other than waste or backwash yuou need to replace the internal gasket in the valve.
6helpful
3answers

My new Hayward Pool Sand Filter won't backwash.

Hey!
Mine was doing the same thing. I had the hoses switched up. I had the hose from the pump connected to the port marked RETURN (on the Hayward vari pump valve). Not good! I also had the return line hose (from pool) connected to the port marked pump. It happens! The problem is I tried EVERYTHING ELSE before I found my error. This includes a trip to Leslie's to buy a brand new multi port valve (good thing they have a return policy) AND changing out my relatively new sand in the filter AND taking apart the vertical tube and each individual flange at the bottom to clean them out. Please check your hoses FIRST if it won't backwash! By the way...I've been a pool owner for 17 years. I think my experience worked against me since I didn't recheck my work at setup.
NOTE:
It might SEEM like your filter is working because you get suction at the skimmer and water rushing thru the return line into the pool. It's not working if your lines are backwards like mine were! My water started turning green!
0helpful
1answer

Waste line leaking

When you had the unit apart, did you note the correct alignment of the handle to the diverter? You may have put the handle on 180 degrees away from the correct orientation and therefore flipped all the settings, making filter=backwash, etc...

If thats not it, any chance it has freeze damage inside from not draining completely and therefore needs a new valve?
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