it requires immediate replacement

it facilitates precise energy efficiency by modulating between heating stages based on thermostat demand

Each relay is rated for 10A resistive loads

To verify performance

Resideo TH8321R1001 Thermostat 319825-402 it requires immediate replacementThe Resideo TH8321R1001 VisionPRO 8000 is a versatile 7 day programmable thermostat engineered with RedLINK technology for robust wireless communication. Designed for flexibility, this unit operates as a standalone controller for up to 3H 2C heat pump or 2H 2C conventional systems. When integrated with an Equipment Interface Module (EIM), its capacity expands to 4H 2C heat pump or 3H 2C conventional configurations. It supports 18 30Vac or 750mV