CAUTION 
The heater should be turned on several times after initial installation to completely remove air from the fuel supply system and to fill the fuel lines with fuel.
The heater should be carefully checked for leaks and safety conditions of all connections before use. If there is smoke emission, abnormal combustion noise or fuel odor, the heater should be turned off and the safety removed so that it cannot be operated and can only be used after professional overhaul. 
The following maintenance work must be carried out by a qualified professional for an inspection before each heating season
1) Check the circuit connectors for corrosion and looseness.
2) Check the air intake and exhaust pipes for obstruction and damage.
3)Check fuel lines for leaks.

The heater should be run once a month when it is not in use for a long time about 10 minutes of work each time the fuel pump and the air-assisting fan, etc. to prevent mechanical parts from malfunctioning.
The air inlet and outlet of the heater must be kept free of blockage and dirt so that the warm air ducts are unobstructed to prevent overheating.
The air inlet and outlet of the heater must be kept free of clogs and dirt so that the warm air ducts are free from obstruction to prevent overheating.
When welding on the vehicle, remove the heater's positive terminal from the battery and ground it to prevent damage to the controller.
Only authorized customer service stations are permitted to install or repair the heater and the use of non-original parts is prohibited to avoid danger.