Fuel Treatment System - Troubleshooting - MTU 12 V 2000 M92 Operating Instructions Manual

6 Troubleshooting
6.1 Fuel treatment system – Troubleshooting
Illuminated pushbutton "Water alarm" is lit.
Cause
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.
Signal lamp "Pump fault" is lit.
Cause
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.
Signal lamp "Warning filter" is lit.
Cause
The differential pressure exceed‐
ed 1.3 bar.
Illuminated pushbutton "Replace filter element" is lit.
Cause
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.
Corrective action
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.
Corrective action
u Reset motor protection relay.
Corrective action
u Replace coalescer filter element (→ Page 120).
Corrective action
1. Replace coalescer filter element (→ Page 120).
2. Press illuminated pushbutton "Replace filter element" to ac‐
knowledge.
M015700/06E 2012-06 | Troubleshooting | 53