verify your controller’s input configuration matches the Type III (Gray) resistance-temperature table

Confirming 24VAC or DC signals at the 16-pin communication plug is essential for diagnostic accuracy

Precise airflow monitoring and combustion safety are paramount

or enlarged ports that cause localized overheating on the section assembly

Automatic Reset Functionality: Features a 40°F differential

Aprilaire 4240 Male Disconnect Assembly 328140-751 verify your controller’s input configurationThe Aprilaire 4240 Male Disconnect Assembly is a factory original OEM replacement part engineered specifically for the Aprilaire 700 series whole house humidifiers. This male disconnect assembly serves as the critical electrical interface, plugging directly into the humidifier base to establish wiring continuity with the female disconnect. By facilitating a secure connection between the two halves of the humidifier unit, it ensures the HVAC humidifier