[porsche tech]

We have the same set up and the pan does drain to outside the house. Occasionally I run water through the drain to make sure it’s not clogged. The plumber was here (because the water got extremely hot) and said it was 10 years old and it needed a thermostat but they don’t repair them if they’re older than 10 years. I got 2 new thermostats on Amazon for $50 and installed them. Been working fine for a couple of months now and occasionally I go up there to make sure there is no leakage in the pan. Anyway, sounds like 10 years may be closing in on the end of its life.