Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

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Spa emptying when pump stops

By reading your website, my problem is not having a check valve on my spa, thus all the water running back into the pool when the pump shuts off. My question is......does not having a check valve hurt my spa in any way?

I have a Hayward pool pump.

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Yes, if you have plaster it will get a ring around it. I live in Phoenix and with the sun and heat it will hurt the exposed plaster.
I don't know how old your pool is but many of the ck valves on the market today are serviceable. Meaning you can open them and replace the gut or clean it if that is all it needs. So if you replace it go for the extra it takes to get one of these as it will make the future a nice place if this happens again.
You probally have at least two of these on your system one on the suction side and one on the return, and one is as old as the other. So you might want to do both at the same time.

Posted on May 13, 2010

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What setting do you put it on to drain the pool for plaster repair


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Hi! I have a Hayward Pro pool/spa system with Jandy valves and I'm trying to figure out how to switch them from pool to spa. Either I empty the spa or I'm heating the whole pool. Help please!


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Why does the spa empty when the pump shuts off? just got a pool with an aqualink RS4 and no manual to look at. thanks


This problem can be caused by a couple things. the two most likely culprtits are either the absence of check valves and or incorrect actuator settings when the pump shuts down.

Your spa is most likely higher than the pool. You most likely have a spill over (waterfall) feature from the spa into the pool. This is so the spa water can be recirculated in pool mode. One of your actuator valves may be slightly off closed position in order to allow spill over in the spa, or you may have a dedicated overfill pipe in the circuit to feed water to spa in pool mode.

Whichever spill over piping you have set up, when the pump shuts down, water from the spa ( higher level than the pool) will backfeed through the overflow spa circuit, back through the pump and into the pool through either drain or return. Effectively rendering your spa level the same level as your pool.

To fix this problem, simply install check valves into the spa runs and as a secondary measure put one into the pool return run ( the run that feeds water to pool).

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