Engineered to replace obsolete HK61GA001 and HK61GA003 Texas Instruments boards

Precise airflow monitoring and combustion safety are paramount

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

Common symptoms include the boiler firing but the water pump failing to start

Aprilaire 4240 Male Disconnect Assembly 328140-751 Engineered to replace obsolete HK61GA001The 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