Resideo V8044A1010 Valve 318172-701 It connects via a standard

It connects via a standard six-wire RJ-11 jack

5-flash fault codes on the furnace control board

this unit is designed for fail-safe operation

we recommend using this HVAC pressure switch to ensure the 650/500 setpoints remain exactly as the manufacturer intended for specific Trane HVAC parts compatibility

while 780-781 is the Robertshaw manufacturer number for the same control board

Resideo V8044A1010 Valve 318172-701 It connects via a standardThe Resideo V8044A1010 is a heavy duty 3 way diverting zone valve engineered specifically for demand side control in closed loop hydronic heating and cooling systems. Built with a rugged brass body and a stainless steel stem, this 24Vac motorized valve directs water flow from a common inlet to either of two outlets. It features a 1 2 inch sweat connection and a high torque spring return mechanism, ensuring the valve defaults to the closed position