Tekmar Controls 521 Thermostat 318172-701 two flashes indicate a pressure

two flashes indicate a pressure switch fault

Simplified Wiring: Equipped with a 1-meter halogen-free appliance cable for efficient installation in tight plenum spaces

preventing short-cycling and maintaining optimal thermal management

Drop-in Replacement: Specifically designed to replace Armstrong 46K88 and R47429-001

Tekmar Controls 521 Thermostat 318172-701 two flashes indicate a pressureThe Tekmar 521 Programmable Thermostat is a versatile microprocessor based control designed for precise single stage heating, two stage heating with fan, or one stage heating one stage cooling applications. Engineered for 24V AC DC systems, this unit supports hydronic radiant floor heating, baseboard convection, and forced air systems. The 7 day programmable schedule allows for four distinct events per day, optimizing energy cycles without