7 Troubleshooting
7.1 Fuel treatment system – Troubleshooting
Illuminated pushbutton “water alarm” is lit.
Cause Corrective action
When the maximum water level is
reached, the water level electrode
opens the water drain valve and
water is discharged. If the opening
period of the valve exceeds a pre-
set limit (4 minutes), 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-running,
the motor protection relay
triggers and the pump is switched
off.
u Reset motor protection relay.
Signal lamp “Warning filter” is lit.
Cause Corrective action
The differential pressure
exceeded 1.3 bar.
u Replace coalescer filter element (→ Page 124).
Illuminated pushbutton “Replace filter element” is lit.
Cause Corrective action
The max. permissible differential
pressure of 1.5 bar was exceeded.
If the coalescer filter element is
not replaced, pressure will
increase 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 124).
2. Press illuminated pushbutton “Replace filter element” to
acknowledge.
56 | Troubleshooting | MS150063/03E 2016-02
TIM-ID: 0000028607 - 001
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