Yes, we had the same problem with that same air control valve! Our tech from the Sundance dealer could not (or did not want to) find the source of the problem. After several unsuccessful visits, we insisted that the dealer bring in an outside company to resolve the issue. We also had a defective top audio remote control. The Sundance tech replaced the remote but the 2nd one was also defective!
Everything is now finally working 6 months after the purchase!
Here's the deal with that air control valve-it controls the 2 foot jets at the bottom of the spa. They replaced that air contol valve and now it works! It's activated by turning the large massage selector to position "C" ( pointing toward that air valve or see page 24 in the owner's manual) and Jet #1 on high speed. When you turn that air control valve on , there's now a surge of water from the two foot jets.
We also have those foot jets come loose once in a while! See page 33 to reset the jet.
We really love the Certa but it's unfortunate it took so long to get these problems resolved.
If you're having the exact same problem with that air control valve, there's probably other Certas out there with the same defect. I wonder if Sundance is aware of the problem.
Keep pressing your Sundance dealer until you get satisfaction. We paid a lot of money for that spa and everything should work properly!
