| Option/ Additional Information |
Possible cause | Remedy |
|---|---|---|
| No smell of fuel | Intermediate fuel reservoir empty | Allow vehicle engine to run for approx. 30 seconds. Replace intermediate fuel reservoir |
| No smell of fuel Intermediate fuel reservoir full |
Solenoid valve fails to open | Perform resistance test on flame detector. Replace intermediate fuel reservoir |
| Overvoltage because battery charger is connected | Disconnect battery charger | |
| Fuel supply to heater is disrupted | Remove burner insert following the directions contained in the workshop manual. Check that rubber gasket is present and securely fitted into socket. Activate combustion air fan motor and solenoid valve using the component tester. Fuel must emerge from rubber gasket in a pulsating flow. If this is not the case, replace intermediate fuel reservoir. |
|
| Burner insert has been incorrectly mounted, or burner matting is worn | Inspect burner insert, replace if necessary and install new one in accordance with directions contained in workshop manual | |
| The control unit detects a fault in the following circuits: combustion air fan, circulating pump, solenoid valve, flame detector and glow plug. Fault lock-out and run-down period are initiated | Locate defective component and replace. Combustion air fan and circulating pump: Check for continuity and housing ground connection at connector X17 / X18 (check wires bk / br). Solenoid valve: Check for continuity to ground at 6-pin connector X14 at heater Pin 6. Flame detector: Check resistance at connector X19 wire br / br at 25°C. Resistance should be 2.9 - 3.6 Ohms. Glow plug: Measure resistance at connector X16, wire ye / ye at 25°C. Resistance should be 0.32 - 0.36 Ohm |
|
| Resistance of glow plug too high | Replace glow plug in accordance with directions given in the workshop manual | |
| Defective control unit | Replace control unit / heat exchanger in accordance with directions given in the workshop manual |