Look for visible soot tracking around the plate

the reversing valve solenoid can often be replaced separately

The Reznor 146465 Limit Switch is a critical OEM replacement part engineered for precise thermal regulation in unit heaters and forced-air systems

or if the eyelets no longer provide a snug fit

Trane VAL9225 TXV 321894-709 Look for visible soot trackingThe Trane VAL9225 TXV is a high precision 1. 5 ton thermostatic expansion valve designed specifically for residential and light commercial R 410A refrigerant systems. Engineered to maintain precise superheat control, this direct acting thermal expansion valve features a 5 8" inlet and 5 8" outlet with mechanical fittings, ensuring a secure and leak free installation in the evaporator circuit. The VAL09225 operates with a 20 inch capillary tube and an