Unit Control Board Flash Codes - York ZJ078 Installation Manual

524581-YIM-I-0512
®
Predator Flash Codes
Various flash codes are utilized by the unit control board (UCB)
to aid in troubleshooting. Flash codes are distinguished by the
short on and off cycle used (approximately 200ms on and
200ms off). To show normal operation, the control board
flashes a 1 second on, 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 prevent
confusion, a 1-flash, flash code is not used.
Alarm condition codes are flashed on the UCB lower left Red
LED, See Figure 36. While the alarm code is being flashed, it
will also be shown by the other LEDs: lit continuously while the
alarm is being flashed. The total of the continuously lit LEDs
Table 28: Unit Control Board Flash Codes
Flash Code
On Steady This is a Control Failure
1 Flash Not Applicable
2 Flashes Control waiting ASCD
3 Flashes HPS1 Compressor Lockout
4 Flashes HPS2 Compressor Lockout
5 Flashes LPS1 Compressor Lockout
6 Flashes LPS2 Compressor Lockout
7 Flashes FS1 Compressor Lockout
8 Flashes FS2 Compressor Lockout
9 Flashes Ignition Control Locked Out / Ignition Control Failure
10 Flashes Compressors Locked Out on Low Outdoor Air Temperature
Compressors locked out because the Economizer is using free
11 Flashes
1
Cooling
12 Flashes Unit Locked Out due to Fan Overload Switch Failure
13 Flashes Compressor Held Off due to Low Voltage
14 Flashes EEPROM Storage Failure
OFF No Power or Control Failure
1. Non-alarm condition.
60
Description
1
1
equates to the number of flashes, and is shown in the table.
Pressing and releasing the LAST ERROR button on the UCB
can check the alarm history. The UCB will cycle through the last
five (5) alarms, most recent to oldest, separating each alarm
flash code by approximately 2 seconds. In all cases, a flashing
Green LED will be used to indicate non-alarm condition.
In some cases, it may be necessary to "zero" the ASCD for the
compressors in order to perform troubleshooting. To reset all
ASCDs for one cycle, press and release the UCB TEST/
RESET button once.
Flash codes that do and do not represent alarms are listed in
Table 28.
Green Red
LED LED
16 8
-
-
Flashing Off
Off Off
Off Off
Off Off
Off Off
Off Off
Off On
Off On
1
Flashing On
Flashing On
Off On
Flashing On
Off On
Off Off
Red Red
LED LED
4 2
- - -
- - -
Off On
Off On
On Off
On Off
On On
On On
Off Off
Off Off
Off On
Off On
On Off
On Off
On On
Off Off
Johnson Controls Unitary Products
Red
LED
1
-
-
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
Off