A.O. Smith HW 610 warranty No Call for Heat Not applicable None

Table 12.

Continuous Retry Models C, M, E, and K Only - Green LED Status Codes

Green LED
Flash Code	Indicates	Next System Action	Recommended Service Action
(X+Y)a
OFF	No "Call for Heat"	not applicable	none
Flash Fast	Startup - Flame sense calibration	not applicable	none
Heartbeat	Normal operation	not applicable	none
			If system fails to light on next trial
	5 minute Retry Delay		for ignition check gas supply, pilot
		Initiate new trial for ignition after	burner, spark and flame sense
2	- Pilot flame not detected during trial
	for ignition	retry delay completed.	wiring, flame rod contaminated
			or out of position, burner ground
			connection.
			If system fails to light on next trial
	Recycle	Initiate new trial for ignition. Flash	for ignition, check gas supply,
3		code will remain through the ignition	pilot burner, flame sense wiring,
	- Flame failed during run
		trial until flame is proved.	contamination of flame rod, burner
			ground connection.
		If situation self corrects within 10
		seconds, control returns to normal	Check for pilot flame. Replace gas
4	Flame sensed out of sequence	sequence. If flame out of sequence	valve if pilot flame is present. If no
		remains longer than 10 seconds,	pilot flame, cycle "Call for Heat." If
		control goes to Flash code 6+4 (see	error repeats, replace control.
		below).
			Check flame sense lead wire for
		Control remains in wait mode. When	damage or shorting. Check that
7	Flame sense leakage to ground	the fault corrects, control resumes	flame rod is in proper position.
		normal operation after a one minute
		delay.	Check flame rod ceramic for cracks,
			damage or tracking.
		Control remains in wait mode. When	Check transformer and AC line for
8	Low secondary voltage supply-	the fault corrects, control resumes	proper input voltage to the control.
	(below 15.5 Vac)	normal operation after a one minute	Check with full system load on the
		delay.	transformer.
	5 minute Retry Delay		Check gas supply line, pilot burner,
		Initiate new trial for ignition after	spark and flame sense wiring, flame
6+2	- On every third retry on the same
		retry delay completed.	rod contaminated or out of position,
	"Call for Heat"
			burner ground connection.
	On every 6th flame failure during run	5 minute retry delay, then initiate	Check gas supply, pilot burner, flame
6+3			sense wiring, contamination of flame
	on the same "Call for Heat"	new trial for ignition.
			rod, burner ground connection.
		Control waits until flame is no	Check for pilot flame. Replace gas
		longer sensed and then goes to
	Flame sensed out of sequence-		valve if pilot flame present. If no pilot
6+4		soft lockout. Flash code continues.
	longer than 10 seconds		flame, cycle "Call for Heat." If error
		Control auto resets from soft lockout
			repeats, replace control.
		after one hour.
ON	Soft lockout due to error detected	Control auto resets from soft lockout	Reset by cycling "Call for Heat." If
	during self check sequences	after one hour.	error repeats, replace the control.

aFlash Code Descriptions:

-Flash Fast: rapid blinking.

-Heartbeat: Constant 1/2 second bright 1/2 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.

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