27024 Debris Removal DEB: Unable to calibrate %s pressure sensor UDRC Cause 1: The zero pressure value for the sensor is not close enough to zero. The line may be plugged and under vacuum or the sensor maybe defective. Solution: Disconnect the sensing line at the sensor and reset the output device. If the error goes away then there is a blockage in the line that keeps the sensor under vacuum. This is most likely to happen to the nozzle sensor, since the collection nozzle could become clogged with debris over time, blocking the small pressure-sensing hole. Clean the nozzle (see UDRC Techplanet site for detailed instructions): http://techplanet.creo.com/output/heads/debris_removal/nav/proced.htm If you are using a TH1.x nozzle that has its sensing port on the top of the nozzle, replace the nozzle with the current (min Ver C) to avoid future problems.If the error does not go away then the sensor must be replaced. Note: 'Bellmouth' sensor is the 0-100 in-H20 scale Setra brand sensor, and 'Differential' sensor is the 0-10 in-H20 scale. Cause 2: On systems equipped with a Setra nozzle sensor. The control lines to the nozzle sensor may have been touched together while energized. This will damage a diode on the Lionel board causing the sensor to display half its value. This value will be greater than +-5% from the anticipated 0 value and not permit calibration. Solution: Start the system then use the command "debris debug" to list the offset values (this command may not be available in Lotem Control Software). The offset for the nozzle Setra sensor should be about 180. If the value is about 90 this is your problem. Unplug the UDRC and remove the chemical upgrade enclosure. Measure the resistance between the negative lead of the pressure sensor and the ground socket on the Lionel board. The value should be 220 OHMS. If not, replace the Lionel board or remove the following diodes from the board: D37, D46, D41. ..\..\ShowAllErrors.htmFirmware 0 Error Index ..\..\ShowAllCommands.htmFirmware 0 Command Index ..\..\ShowAllNVS.htmFirmware 0 NVS Index Updated: Wed Jul 16 19:34:14 2008 PST