On Nov 1, 2:19 pm, wrote:
I have a Price Pfister shower faucet, it is a single lever turn handle
type. When I turn it to the cold water setting I get hot water for the
first few minutes. It then goes cold but it is very hard to regulate
warm water, I either get hot or cold. I was assuming it is a valve
within the cartridge that separates the hot and cold. I am also
getting hot water coming out of the sink tap for about 30 seconds now
as well. Will replacing the cartridge in the shower faucet solve both
problems or is something else going on with the plumbing?

Sounds like a cross connect between the hot and cold somewhere in the
house, possibly with a pressure differential for added excitement.

I have hot and cold water spigots at the front of my house, connected
by a Y hose. The cold is directly off the street pressure, the hot is
obviously at house pressure. If I leave both spigots open with a
closed hose attached, the street pressure cold water will force the
hot water back into the pipes and essentially reverse the flow of
water in my entire house. Cold water comes of hot taps, hot then warm
water comes of cold taps, toilets flush warm, etc.

Trust me, the first few times it happened I was completely baffled,
especially since it went away soon afterwards. It finally dawned on me
that it only happened when we were using the hot water outside.