| Option/ Additional Information |
Possible cause | Remedy |
|---|---|---|
| Heater is not securely mounted in support and draws in exhaust gas. Exhaust gas gasket not fitted. |
Loosen 2 M6x20 screws at the mounting plate (side panel) and position heater correctly. Remove heater, install new exhaust gas gasket and reinstall heater |
|
| Heater's installation position is not permissible | Install heater in permissible installation position in accordance with installation instructions | |
| Distance between the combustion air intake opening and the discharge opening of the exhaust pipe is to small. Heater sucks exhaust gas as combustion air. |
Change the position of the combustion air intake opening or the discharge opening of the exhaust pipe (minimum distance 20 cm) | |
| Fuel lines of heater not properly connected. Flow and return pipes were interchanged. |
Connect fuel lines correctly | |
| A non-return valve may have been installed in the fuel line between heater and vehicle tank, or in the vehicle tank itself (intermediate fuel reservoir is not ventilated). | Install bypass valve (venting valve) in accordance with installation kit ID-no. 64545B. With one-line systems, only heaters of the type Thermo Top C or E can be installed. |
|
| Heater's heat exchanger is hot, engine is cold | Kinked coolant hose or system has not been bled completely | Check routing of coolant hoses. Vent cooling system in accordance with manufacturer's directions |
| Heater's heat exchanger is hot, engine is cold | No pumping action of circulating pump | Check for continuity and housing ground connection at connector X18 (wire bk / br). If continuity is not indicated, circulating pump is defective. Replace circulating pump in accordance with directions given in the workshop manual |