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If your spa drains down after the pool turns off chances are it is a check valve failure. This could mean that the check valve is bad or debris is stuck inside of it.
The check valve is designed to keep the water from dropping down to the pool water level in an elevated spa (which is how most pools with spas are designed). If the check valve is not working properly, water will flow back down through the pipes as gravity takes effect. So 75% of the time it will be faulty check valve.
But not always. At the end of the video I show other possible causes such as a bad or faulty Valve Actuator.
For more on the Valve Actuator see these videos:
Pool Valve Actuator Manual Mode & Manual Override part 1 of 2: • Pool Valve Actuator Ma...
Pool Valve Actuator Failure, Removal part 2 of 2: • Pool Valve Actuator Fa...
I mention also a suction leak or air leak that could cause this to happen in some cases. For a Playlist covering various air leaks at the pool pump:
• Pool Pump Not Working
For more on how to turn your pool and spa valves properly see these videos -
I made this one just for my wife but viewers seem to like it to:
How to put pool into spa mode and start the Heater: • How to put your pool i...
Pool Equipment Overview part 2 of 2 Swimming Pool Valves: • Pool Equipment Overvie...
So these are the most common things that will cause your spa to drain down when the pool is running or when it is off. Sometimes it takes a while to troubleshoot this problem since it can be more than one thing causing the spa to drain down. I would start with the check valve and then work down the list.
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