Today I adjusted the maximum temperature setting on a Moen PosiTemp shower valve. The existing setting was limiting the hot water flow, resulting in inadequate shower temperatures for the customer's preference. Using a Moen service tool, I removed the trim plate and turned the safety stop adjustment screw clockwise to increase the allowable hot water percentage. After reassembling the valve, I tested the new temperature range within safe limits. The customer was advised on the risks of scalding and the need for anti-scald devices if further increases were desired. Proper warnings were provided per code requirements.