Fault Screen "Venting on Drain" "Drain not closed"

When the instrument is turned on, the drain valve opens to vent the vessel. If the drain open/close switch is not sensed by the computer this fault occurs.

Possible Causes:

Wires on the drain valve have become dislodged. Connections may have become loose. Unplug the instrument, check the drain valve and reattach any loose wires. Check blue wire (I1), yellow wire (I2), black wire (4),and red wire (4). See DELTA Service Procedure 26.

The drain valve or the drain open/close switch is not operating. When the instrument is turned on, the LED on relay #6 should light briefly (see DELTA Service Procedure 26). At that time you should hear the drain valve opening. After 10 seconds, the drain valve will close and the LED on relay 6 should light briefly again. If the drain valve is not operating, it will need to be replaced. If the drain valve is operating but does not stop, this means the computer is not detecting the open/close switch.  Follow instructions from FAQ: Fault Screen "Drain Problem" "Ck Sensor" "<START>"

The level sensor is reading a full vessel when it should be empty. Slowly open the vessel and check the level.

If the vessel is actually full... Possible Causes:

If the vessel is actually empty... Possible Causes:

The level sensor needs to be cleaned and possibly retrained. See DELTA Service Procedure 007 for Analog Level Sensor.