A.O. Smith HW 610 Led Status And Troubleshooting, Location of LEDs Flame LED Yellow, Yellow LED

The following procedures are provided as a general guide.

Any module should be replaced if it does not perform properly on checkout or troubleshooting.

In addition, replace any module if it is wet or looks like it has ever been wet.

LED STATUS AND TROUBLESHOOTING

The control has two LEDs; one for flame sensing and one for system status:

FIGURE 37.

Location of LEDs.

•Flame LED (Yellow)

–Indicates flame presence and strength. See Table 11.

•Status LED (Green)

–Indicates system operation status and error conditions. See Table 12 and Table 13 on pages 53 and 54 for status specific to each model.

Table 11

Yellow LED Flame Codes

Yellow LED	Indicates	Recommended
Flash Codea		Service Action
Heartbeat	Normal Flame Signal	not applicable
	Weak Flame Signal-
	Sytem will operate
	reliably but flame
	signal is less than	Perform routine
	desired.
2		maintenance to
	NOTE: This indication	assure optimum
		flame signal.
	may flash temporarily
	during or shortly
	after lightoff on some
	applications.
	Marginal Flame Signal
	(less than 1.1µA)-
	System may not
	operate reliably over
	time.	Check gas supply,
		pilot burner, flame
1	Service call	sense wiring,
	recommended.	contamination of
		flame rod, burner
	NOTE: This indication	ground connection.
	may flash temporarily
	during or shortly
	after lightoff on some
	applications.
	No Flame or Flame
OFF	Signal below minimum	not applicable
	threshold for system
	operation.

aFlash Code Descriptions:

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

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

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