Therapy Vlave gone bad?

[benalexe]

One of the therapy control valves on my spa does not do anything when I turn it. I called Thermospas and they said I peobably need to replace the valve which they will send me at no charge.

I was just wondering do these valves often go bad?  What would cause them to go bad?  are they hard to replace?

[Spatech_tuo]

One of the therapy control valves on my spa does not do anything when I turn it. I called Thermospas and they said I peobably need to replace the valve which they will send me at no charge.

I was just wondering do these valves often go bad?  What would cause them to go bad?  are they hard to replace?

I think they're assuming that you are turning the handle but the valve is not turning. If you're sure the valve is turning when you turn the handle then a new valve won't do anything.

[benalexe]

I turn the knob. I think it is one of the air intakes and it does not do anything.