Fuel Treatment System - Troubleshooting - MTU 12 V 4000 M33F Operating Instructions Manual

5.2 Fuel treatment system – Troubleshooting
Illuminated pushbutton 'water alarm' is lit.
Cause
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 preset limit
(4 minutes), 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-
running, the motor protection
relay triggers and the pump is
switched off.
Signal lamp 'Pre-alarm' is lit.
Cause
The differential pressure
exceeded 1.3 bar.
Illuminated pushbutton 'Replace filter element' is lit.
Cause
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.
Corrective action
1. Press illuminated pushbutton 'Water alarm' for
acknowledgment.
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 252).
Corrective action
1. Replace coalescer filter element (→ Page 252).
2. Press illuminated pushbutton 'Replace filter element' for
acknowledgment.
MS150069/02E 2014-03 | Troubleshooting | 97