What causes a Lennox 18M84 limit switch to trip repeatedly

which are specifically chosen to extend service life when switching high-frequency inductive loads

and 3/4" to 1-1/2" cage trim valves

Durable Construction: Equipped with sealed ball bearings and a rigid mount to handle the radial loads of belt-driven systems

as well as lead-free LF288A models

Nordyne 669565R TXV 319825-402 What causes a Lennox 18M84The Nordyne 669565R is a high precision 2. 5 ton thermostatic expansion valve engineered specifically for R 410A refrigerant systems. This TXV with external equalizer (EQL) is a critical component for maintaining the correct superheat at the evaporator outlet, preventing liquid slugging and ensuring the compressor remains within its designed operating envelope. Designed as a direct OEM replacement for select Nordyne, Miller, and Intertherm air