U.S. Boiler Company INDEPENDENCE IN3PV, Installation & Operating Manual

18

Table 11:  Green LED Status Codes

Ignition Module

Terminal Designation

Wiring Ladder Diagram Terminal Number

MV

1

MV/PV

2

PV

3

GND

4

24V (GND)

5

24V

6

SPARK

9

Table 10:  Ignition Module Terminal Cross-Reference

Green LED 

Flash

Code

a

Indicates

Next System Action

Recommended Service Action

OFF

No “Call for Heat”

N/A

None

Flash Fast

Power up - internal check

N/A

None

Heartbeat

Normal startup - ignition sequence 

started (including prepurge)

N/A

None

4 Seconds ON 

then “x” flashes

Device in run mode.

“x” = flame current to the nearest µA.

N/A

None

2

5 minute Retry Delay

- Pilot flame not detected during trial 

for ignition

Initiate new trial for ignition after 

retry delay completed.

If system fails to light on next trial for 

ignition check gas supply, pilot burner, 

spark and flame sense wiring, flame rod 

contamination or out of position, burner 

ground connection.

3

Recycle

- Flame failed during run

Initiate new trial for ignition.  Flash 

code will remain through the igni-

tion trial until flame is proved.

If system fails to light on next trial for igni

-

tion, check gas supply, pilot burner, flame 

sense wiring, contamination of flame rod, 

burner ground connection.

4

Flame sensed out of sequence

If situation self corrects within 10 

seconds, control returns to normal 

sequence.  If flame out of sequence 

remains longer than 10 seconds, 

control will resume normal opera-

tion 1 hour after error is corrected.

Check for pilot flame.  Replace gas valve 

if pilot flame present.  If no pilot flame, 

cycle “Call for Heat.”  If error repeats, 

replace control.

6

Control Internal Error

Control remains in wait mode.  

When the fault corrects, control 

resumes normal operation.

Cycle “Call for Heat”.  If error repeats, 

replace control.

7

Flame rod shorted to ground

Control remains in wait mode.  

When the fault corrects, control 

resumes normal operation.

Check flame sense lead wire for damage 

or shorting.  Check that flame rod is 

in proper position.  Check flame rod 

ceramic for cracks, damage or tracking.

8

Low secondary voltage supply- (be

-

low 15.5 Vac)

Control remains in wait mode.  

When the fault corrects, control 

resumes normal operation.

Check transformer and AC line for proper 

input voltage to the control.  Check with 

full system load on the transformer.

a

Flash Code Descriptions:

-  Flash Fast: rapid blinking

-  Heartbeat: Constant ½ second bright, ½ second dim cycles.
-    4 second solid on pulse followed by “x” 1 second flashes indicates flame current to the nearest µA.  This is only available in 

run mode.

-  A single flash code number signifies that the LED flashes X times at 2Hz, remains off for two seconds, and then repeats the 

sequence.

VII. System Start-up (continued)