Anti-scald where there was none before?
Hi Everyone, been awhile since I've been here, but this one's got me really puzzled and I'm hoping for some help... Its my bath faucet. It's a two-handled Price Pfister Treviso model. Hot water just stopped flowing one day. I did the usual and assured water pressure on hot side throughout (entirely through the faucet as I turned on the water with the cartridge removed just to be sure) - In fact pressure is quite high frankly - so problem is isolated in the faucet, no question. Replaced cartridge - didn't fix it. Still no flow. Hot water flows momentarily followed by a thud sound, rather like a solenoid. Called PF customer service. I offered a video showing the problem including sound. They had no way of receiving my video. Customer service rep insisted that it was the cartridge even though I had just replaced one.
Now here's where it gets interesting. Realizing these are cheap plastic cartridges, I wondered if my 'rather high' water pressure might be deep-sixing the cartridge the very first use. But then I noticed that if I turned on the cold water and had some flowing, the hot water would flow!
Now I wondered if there's some kind of anti-scald feature in the design? And it sure is acting like that. But it never did that before. We could indeed run JUST the hot water if we chose to. Now it seems almost miraculously that I have an anti-scald feature where there was none before! Anyone have an idea what's going on here? Is this normal? Is it due to the high pressure? Are faucets really smart? There is no obvious anti-scald feature anywhere. I plumbed this myself back in 2010. In fact I have the same Treviso faucets in two other sinks and I can run just the hot side on those.
I chill at the thought of attempting to explain this to PF customer service (friendly but not speaking the greatest English quite frankly)
Thank You for reading this long post.