76 1100 Series WS MWS Reference Manual
3 Troubleshooting and Test Functions
Valve to Mainpass Failed
The injection valve failed to switch to the mainpass position.
The switching of the injection valve is monitored by two microswitches on the
valve assembly. The switches detect the successful completion of the valve
movement. If the valve fails to reach the mainpass position, or if the
microswitch does not close, the error message is generated.
Probable Causes
• Valve in an intermediate position between the bypass and mainpass
positions.
• Defective injection valve.
• Defective MTP board.
Suggested Actions
✔ Turn the WPS main power OFF and ON.
✔ Exchange the injection valve.
✔ Exchange the MTP board.
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