| Option/ Additional Information |
Possible cause | Remedy |
|---|---|---|
| Heater's installation position is not permissible | Install heater in permissible installation position in accordance with installation instructions | |
| Fuel lines of
heater not properly connected. Flow and return pipes were interchanged. |
Perform fuel system integration in accordance with installation instructions | |
| Non-return
valve in fuel system. Underpressure in fuel system. |
Fuel to be tapped by means of fuel tapping device from vehicle's fuel tank | |
| Fuel lines permitting fuel to evaporate were routed too close to hot components | Route fuel lines in accordance with installation instructions | |
| Incorrect installation position of dosing pump | Install dosing pump in permissible installation position in accordance with installation instructions | |
| 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 X5 (wire bk / br). If continuity is not indicated, circulating pump is defective. Replace circulating pump in accordance with directions given in the workshop manual |