Unit Control Board; Ignition Control Flash Codes - York DM090 Installation Manual

127408-YIM-B-0606
TABLE 53: IGNITION CONTROL FLASH CODES
FLASHES FAULT CONDITIONS
STEADY ON
Control Failure
HEARTBEAT Normal Operation
1 Not Applicable
Pressure Switch
2
Stuck Closed
Pressure Switch Failed
3
To Close
4 Limit Switch Open
Flame Present With Gas
Off First Stage Gas Valve
Energized With W1 Off
5 Second Stage Gas Valve
Energized With First
Stage
Gas Valve Off
6 Ignition Lockout
No Power Or Control
STEADY OFF
Failure
Check
Alarm
History
Reset All
ASCDs for
One Cycle
Non Alarm
Condition Green
LED Flashing
Current Alarm
Flashed
Red LED
FIGURE 30: UNIT CONTROL BOARD
Unitary Products Group
CHECK
Control
Pressure Switch
Venter Pressure Switch
Vent Blocked
Main Limit
AUX Limit
Gas Valve
Gas Flow
Gas Pressure
Gas Valve
Flame Sensor
24VAC or Control
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