My Mastertemp heater, which is about 2.5 years old now, hums loudly when I try to turn it on and the service light comes on. It sounds like an electric motor that is bound up and won't turn, like a fan that won't turn. It is out of warranty. I am trying to find someone to service it, but am having no luck getting anyone to answer any of my emails. I live in Phoenix, where there are more pools per capita than I think anywhere in the world. Can anyone help with an idea or a service provider here?