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127408-YIM-B-0606
Unitary Products Group 51
FIGURE 30: UNIT CONTROL BOARD
TABLE 53: 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
Check
Alarm
History
Reset All
ASCDs for
One Cycle
Non Alarm
Condition Green
LED Flashing
Current Alarm
Flashed
Red LED