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292447-YIM-A-0507
54 Unitary Products Group
Table 30: 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
1
1. 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
Table 31: Ignition Control Flash Codes
Flashes Fault Conditions Check
STEADY ON Control Failure Control
HEARTBEAT Normal Operation
1 Not Applicable
2
Pressure Switch
Stuck Closed
Pressure Switch
3
Pressure Switch Failed
To Close
Venter Pressure Switch
Vent Blocked
4 Limit Switch Open
Main Limit
AUX Limit
5
Flame Present With Gas
Off First Stage Gas Valve
Energized With W1 Off
Second Stage Gas Valve
Energized With First
Stage
Gas Valve Off
Gas Valve
6 Ignition Lockout
Gas Flow
Gas Pressure
Gas Valve
Flame Sensor
STEADY OFF
No Power Or Control
Failure
24VAC or Control
Table 32: Reheat Control Board Flash Codes
Flash Codes Description
On Steady This is a Control Failure
1 Flash Not Applicable
2 Flashes
Hot Gas Reheat is on with Y1 Output
(No Call for Cooling)
3 Flashes
Y1, Y2, and Hot Gas Reheat is on because of
a call for Y1 and Humidistat. See alt operation
OFF No Power or Control Failure