What are the signs that a 100109864 blower needs replacement

check the pressure differential against the switch's rating to confirm if the issue is the part or the system airflow

It means that without power (de-energized)

specifically designed to fit Lennox WF3-15 and WS1-18 humidifier models

This part is a direct OEM replacement and is technically identical to the HH18HV140-B

Amana-Goodman BRC1NRV71 Remote Control 318820-201 What are the signs thatThe Amana Goodman BRC1NRV71 navigation remote control is a wired system interface designed for precise operation of compatible ductless mini split systems and HVAC indoor unit controllers. This digital HVAC remote controller provides centralized access to system functions including temperature adjustment, mode selection, fan speed control, and system navigation through an intuitive interface. Built for integration with select Amana and Goodman