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FAQ

Fault: "Venting on Drain" "Drain not closed". What should I do?

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:

The wires on the drain valve have 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). Refer to DELTA Service Procedure Drain Valve View Internal (DES026).

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 (refer to DELTA Service Procedure DES026). 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 the FAQ titled: 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 full, possible causes include:

  • The drain hose may be kinked. Remove any kinks.
  • The vent valve may not be working. Refer to DELTA Service Procedure Water and Vent Valve Service (DES016).

If the vessel is empty, possible causes include:

  • The level sensor needs to be cleaned and possibly retrained. Refer to DELTA Service Procedure Level Sensor (Analog) Cleaning and Testing (DES007).