961 StarCool Alarm Codes And Actions

961	Pdis sens sup LO
Description	Controller Internal Voltage Reference Fault
Cause	Indication of controller internal voltage reference fault
Trouble shooting	Possible causes: • Defective power supply for main controller. • Defective Pdis pressure transmitter. • Defective main controller. Accompanied alarms: • There may be sensor alarms, especially AL 203. • AL 801 will be activated during FT- or PTI test. Trouble shooting: Check if there are other active (sensor) alarms. Clear these alarms fi rst using their trouble shooting. Access the ”special menu” by pressing "spanner icon" for more than 3 sec. Scroll down until you see the label ”U Pdis” in the display. The value of ”U Pdis” should be in the range between 4.80 and 5.2V DC. While displaying “U Pdis”, remove the connector at Pdis. − If “U Pdis” is now inside the above range, the Pdis pressure transmitter is defective. Replace the Pdis pressure transmitter. − If “U Pdis” is still outside the above range, proceed to next step. While displaying “U Pdis”, disconnect Pdis from the terminals according to wiring schematics inside in the control cabinet. − If “U Pdis” is now inside the above range, the cable for Pdis is defective. Replace cable for Pdis. − If the correct voltage is measured at X22 then circuit is defective. Replace the main controller.
Criteria	Reference voltage Pdis below 4.80V DC