BROAN-NuTone SV12908 Blower Assembly 320734-701 if the WC level is

if the WC level is above the setpoint but the switch remains electrically open

it’s a precision HVAC safety device that must prove a stable micro-amp signal—typically between 2 and 6 μA—back to the control board within seconds of the gas valve opening

Precision Thermal Sensing: Monitors motor winding thermistors to provide accurate trip points based on real-time internal heat

it is the primary processing unit for Aprilaire model 1830 and Aprilaire model 1850 series dehumidifiers

Can I substitute this with a universal overload

BROAN-NuTone SV12908 Blower Assembly 320734-701 if the WC level isThe BROAN NuTone SV12908 Blower Assembly is a high performance OEM replacement part engineered for drop in compatibility with legacy and current Broan NuTone ventilation systems. This heavy duty blower unit, which serves as the direct technical cross reference for part number 12908, is vital for restoring factory spec static pressure and CFM ratings in exhaust fan repairs. As a veteran grade HVAC blower motor assembly, the SV12908 features a precision