On this specific model (10-604-15)

Simplified Field Replacement: Compact design allows for fast installation as a direct replacement relay

attempt a manual reset

maintaining system vacuum integrity

Resideo AM102R-UT-1 Valve 320074-702 On this specific model (10-604-15)The Resideo AM102R UT 1 is a high performance 1 inch Union NPT mixing valve engineered specifically for hydronic heating applications. Built with a Teflon coated spool and nickel plated brass body, this valve is designed to resist mineral scale buildup and maintain a stable 70 180F temperature range in demanding environments. As a proportional thermostatic mixing valve, it provides simultaneous control of hot and cold water supplies to ensure