York SUNLINE 2000 Installation Manual

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175245-YIM-C-100836 Johnson Controls Unitary ProductsUNIT FLASH CODESVarious flash codes are utilized by the unit controlboard (UCB) to aid in troubleshooting. Flash codes aredistinguished by the short on and off cycle used(approximately 200ms on and 200ms off). To shownormal operation, the control board flashes a 1 secondon, 1 second off "heartbeat" during normal operation.This is to verify that the UCB is functioning correctly.Do not confuse this with an error flash code. To preventconfusion, a 1-flash, flash code is not used.Alarm condition codes are flashed on the UCB lowerleft Red LED, See Figure 16. While the alarm code isbeing flashed, it will also be shown by the other LEDs:lit continuously while the alarm is being flashed. Thetotal of the continuously lit LEDs equates to the numberof flashes, and is shown in the table. Pressing andreleasing the LAST ERROR button on the UCB cancheck the alarm history. The UCB will cycle through thelast five (5) alarms, most recent to oldest, separatingeach alarm flash code by approximately 2 seconds. Inall cases, a flashing Green LED will be used to indicatenon-alarm condition.In some cases, it may be necessary to "zero" theASCD for the compressors in order to perform trouble-shooting. To reset all ASCDs for one cycle, press andrelease the UCB TEST/ RESET button once.Flash codes that do and do not represent alarms arelisted in Table 20.TABLE 20: UNIT CONTROL BOARD FLASH CODESFLASH CODE DESCRIPTIONGREENLED16REDLED8REDLED4REDLED2REDLED1On Steady This is a Control Failure - - - - -1 Flash Not Applicable - - - - -2 Flashes Control waiting ASCD 11. Non-alarm condition.Flashing Off Off On Off3 Flashes HPS1 Compressor Lockout Off Off Off On On4 Flashes HPS2 Compressor Lockout Off Off On Off Off5 Flashes LPS1 Compressor Lockout Off Off On Off On6 Flashes LPS2 Compressor Lockout Off Off On On Off7 Flashes FS1 Compressor Lockout Off Off On On On8 Flashes FS2 Compressor Lockout Off On Off Off Off9 Flashes Ignition Control Locked Out / Ignition Control Failure Off On Off Off On10 Flashes Compressors Locked Out on Low Outdoor Air Temperature1 Flashing On Off On Off11 Flashes Compressors locked out because the Economizer is using freeCooling1 Flashing On Off On On12 Flashes Unit Locked Out due to Fan Overload Switch Failure Off On On Off Off13 Flashes Compressor Held Off due to Low Voltage1 Flashing On On Off On14 Flashes EEPROM Storage Failure Off On On On OffOFF No Power or Control Failure Off Off Off Off Off