Install Instructions
30
Green LED
Flash Code
(X + Y)
a
Indicates
Next System Action
Recommended
Service Action
OFF No “Call for Heat” not applicable none
Flash Fast Startup - Flame sense
calibration not applicable none
Heartbeat Normal Operation not applicable none
2 5 minute Retry Delay
-Pilot ame 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 ame 
sense wiring, ame rod contaminated or out of 
position, burner ground connection.
3 Recycle
- Flame failed during run.
Initiate new trial for ignition. Flash 
code will remain through the ignition 
trial until ame is proved.
If system fails to light on next trial for ignition, 
check gas supply, pilot burner, ame sense 
wiring, contamination of ame rod, burner 
ground connection.
4 Flame sensed out of 
sequence
If situation self corrects within 10 
seconds, control returns to normal 
sequence. If ame out of sequence 
remains longer than 10 seconds, 
control goes to Flash code 6 + 4 
(see below).
Check for pilot ame. Replace gas valve if pilot 
ame present. If no pilot ame, cycle “Call for 
Heat.” If error repeats, replace control.
7 Flame sense leakage to 
ground
Control remains in wait mode. When 
the fault corrects, control resumes 
normal operation after a one minute 
delay.
Check ame sense lead wire for damage or 
shorting. Check that ame rod is in proper 
position. Check ame rod ceramic for cracks, 
damage or tracking.
8 Low secondary voltage 
supply - (below 15.5 Vac)
Control remains in wait mode. 
When the fault corrects, control 
resumes normal operation after a 
one minute delay.
Check transformer and AC line for proper input 
voltage to the control. Check with full system 
load on the transformer.
6+2 5 minute Retry Delay
- On every third retry on 
the same “Call for Heat”
Initiate new trial for ignition after retry 
delay completed.
Check gas supply, pilot burner, ame sense 
wiring, contamination of lame rod, burner 
ground connection.
6+3 On every 6th ame failure 
during run on the same 
“Call for Heat”
5 minute retry delay, then initiate new 
trial for ignition.
Check gas supply, pilot burner, ame sense 
wiring, contamination of ame rod, burner 
ground connection.
6+4 Flame sensed out of 
sequence - longer than 10 
seconds.
Control waits until ame is no 
longer sensed and then goes to 
soft lockout. Flash code continues. 
Control auto resets from soft lockout 
after one hour.
Check for pilot ame. Replace gas valve if pilot 
ame present. If no pilot ame, cycle “Call for 
Heat.” If error repeats, replace control.
ON Soft lockout due to error 
detected during self check 
sequences
Control auto resets from soft lockout 
after one hour.
Reset by cycling “Call for Heat.” If error repeats, 
replace the control.
CHART 4
CONTINUOUS RETRY MODEL M - GREEN LED STATUS CODES
a
 Flash Code Descriptions:
  –  Flash Fast: rapid blinking.
  –  Heartbeat: Constant ½ second bright ½ second dim cycles.
  – A single flash code number signifies that the LED flashes X times at 2Hz, remains off for two seconds, and then repeats 
the sequence.
  –  X + Y flash codes signify that the LED flashes X times at 2Hz, remains off for two seconds, flashes Y times at 2Hz, remains 
off for three seconds, and then repeats the sequence. 










