The shower ran hot for about a minute before turning cold, and pressure throughout the house felt inconsistent. Our plumber found the existing pressure regulating device had seized, and the shower mixer cartridge had worn from the strain. Both issues were connected. The seized valve was buried on the 15mm supply line near the meter, and excavation revealed heavy corrosion on the old brass body. A new adjustable pressure regulating device was fitted to the poly line, and the shower mixer cartridge was replaced. Testing confirmed steady temperature and improved flow at the bathroom outlet. Sunshine Coast Plumbing and Hot Water completed both repairs in a single visit. Homes in the 4551 area experiencing similar pressure and temperature fluctuations may benefit from booking plumbing services to assess the incoming supply.
