Operating instructions

5 Troubleshooting
5.1 Fuel treatment system – Troubleshooting
Illuminated pushbutton “Water alarm” is lit.
Cause Corrective action
When the maximum water level
is reached, the water level elec‐
trode opens the water drain
valve and water is discharged. If
the opening period of the valve
exceeds a preset limit (4 mi‐
nutes), the pump will switch off
and an alarm is initiated.
1. Press illuminated pushbutton “Water alarm” to acknowledge.
2. In addition to the automatic water drain function, water can also
be drained manually. To do so, press the illuminated pushbutton
“Water drain” to open the drain valve.
Signal lamp “Pump fault” is lit.
Cause Corrective action
The drive motor is equipped with
an overload protection. If the
maximum permissible current
consumption is exceeded, e.g. in
case of a blockage or dry-run‐
ning, the motor protection relay
triggers and the pump is switch‐
ed off.
u Reset motor protection relay.
Signal lamp “Warning filter” is lit.
Cause Corrective action
The differential pressure exceed‐
ed 1.3 bar.
u Replace coalescer filter element (→ Page 103).
Illuminated pushbutton “Replace filter element” is lit.
Cause Corrective action
The max. permissible differential
pressure of 1.5 bar was exceed‐
ed. If the coalescer filter element
is not replaced, pressure will in‐
crease further and the safety
valve will open. Fuel will be led
via the bypass directly into the
overflow tank.
1. Replace coalescer filter element (→ Page 103).
2. Press illuminated pushbutton “Replace filter element” to ac‐
knowledge.
MS150095/01E 2012-08 | Troubleshooting | 37
TIM-ID: 0000007734 - 006