Product information:

This High altitude control unit is suitable for air heaters AUTOTERM Air 4D with a specific serial number.

Suitable for heaters with the following serial numbers:

• 4191xxxxxxx
• 4766xxxxxxx

This 12V control unit is compatible with AUTOTERM Air 4D heaters equipped with the following air pumps (assy numbers): 

• 1911

Heater equipped with this control unit can work at altitude up to 2500 meters above sea level (MASL).

Interchangeable control units.

In order to change the control unit for 4D with control units assy.3048 and assy.3033, you have to change the Glow plug as well.