969 StarCool Alarm Codes And Actions

969	AirEx 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 sensor pulling power supply down. Defective main controller. Accompanied alarms: There may be sensor alarms, AL 3XX. 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 AirEx” in the display. The value of “U AirEx“ should be in the range between 4.80 and 5.2V DC. While displaying “U AirEx“, remove the connector at AirEx potentiometer. − If “U AirEx“ is now inside the correct above range (4.80 – 5.20V DC), the AirEx potentiometer is defective. Replace the AirEx potentiometer − If “U AirEx” is still outside the above range, proceed to next step. While displaying “U AirEx“, disconnect “AirEx” from the terminals according to wiring schematics inside in the control cabinet. − If “U AirEx” is now inside the above range the cable for “AirEx” is defective. Mount connector correctly or replace connector cable for “AirEx”. − If the correct voltage is measured at X22 and at X23 then circuit is defective. Replace the main controller.
Criteria	Reference voltage AirEx below 4.80V DC