| Option/ Additional Information |
Possible cause | Remedy |
|---|---|---|
| Dosing pump is not delivering | Check for
continuity to ground at 6-pin connector X1 Pin 6. If no continuity to ground is indicated, check wiring and plug connection. If no fault can be located, replace dosing pump |
|
| Overvoltage because battery charger is connected | Disconnect battery charger | |
| 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, glow plug/flame detector. 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 X4 / X5 (check wires bk / br). Glow plug/flame detector: Measure resistance at connector X3, wire ye / ye at 25°C. Resistance should be 0.3 - 0.6 Ohm; Test current: < 5 mA |
|
| Resistance of glow plug/flame detector too high | Replace glow plug/flame detector 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 |