What does a blank display signify

and MA-409 legacy units

such as shaft slippage or excessive resonance that can degrade system efficiency and lead to catastrophic drivetrain failure

It is specifically designed for compatibility with Lochinvar Knight models

When converting

Trane SFSWT03533 Auxiliary Switch 320074-702 What does a blank displayThe Trane SFSWT03533 Auxiliary Switch is a critical SPDT auxiliary switch designed for HVAC 20 60 Amp contactors. As the direct field replacement for the SWT3533, this genuine OEM part provides a single pole, double throw configuration featuring one normally open (NO) and one normally closed (NC) contact. Built for rugged industrial and commercial applications, it integrates seamlessly into Trane air conditioners, furnaces, and heat pumps to drive