Troubleshooting – York DM150 User Manual
Page 50
127408-YIM-B-0606
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Unitary Products Group
TROUBLESHOOTING
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 30. 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 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 52.
Troubleshooting of components may require open-
ing the electrical control box with the power con-
nected to the unit. Use extreme care when
working with live circuits! Check the unit name-
plate for the correct line voltage and set the voltme-
ter to the correct range before making any
connections with line terminals.
When not necessary, shut off all electric power to the
unit prior to any of the following maintenance proce-
dures so as to prevent personal injury.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dan-
gerous operation which could cause injury to person
and/or damage unit components. Verify proper oper-
ation after servicing.
TABLE 52: UNIT CONTROL BOARD FLASH CODES
FLASH CODE
DESCRIPTION
GREEN
LED
16
RED
LED
8
RED
LED
4
RED
LED
2
RED
LED
1
On Steady
This is a Control Failure
-
-
-
-
-
1 Flash
Not Applicable
-
-
-
-
-
2 Flashes
Control waiting ASCD
*
*.
Non-alarm condition.
Flashing
Off
Off
On
Off
3 Flashes
HPS1 Compressor Lockout
Off
Off
Off
On
On
4 Flashes
HPS2 Compressor Lockout
Off
Off
On
Off
Off
5 Flashes
LPS1 Compressor Lockout
Off
Off
On
Off
On
6 Flashes
LPS2 Compressor Lockout
Off
Off
On
On
Off
7 Flashes
FS1 Compressor Lockout
Off
Off
On
On
On
8 Flashes
FS2 Compressor Lockout
Off
On
Off
Off
Off
9 Flashes
Ignition Control Locked Out / Ignition Control Failure
Off
On
Off
Off
On
10 Flashes
Compressors Locked Out on Low Outdoor Air Temperature
1
Flashing
On
Off
On
Off
11 Flashes
Compressors locked out because the Economizer is using free
Cooling
1
Flashing
On
Off
On
On
12 Flashes
Unit Locked Out due to Fan Overload Switch Failure
Off
On
On
Off
Off
13 Flashes
Compressor Held Off due to Low Voltage
1
Flashing
On
On
Off
On
14 Flashes
EEPROM Storage Failure
Off
On
On
On
Off
OFF
No Power or Control Failure
Off
Off
Off
Off
Off