A.O. Smith Burkay HW-300, User Manual

22

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 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 sensor 

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 flame is proved.

If system fails to light on next trial 

for ignition, check gas supply, 

pilot burner, flame sense wiring, 

contamination of flame sensor, 

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 goes to Flash code 6+4 (see 

below).

Check for pilot flame. Replace 

gas control valve if pilot flame is 

present. If no pilot flame, 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 flame sense lead wire for 

damage or shorting. Check that 

flame sensor is in proper position.

Check flame sensor 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 line, pilot 

burner, spark and flame 

sense wiring, flame sensor 

contaminated or out of position, 

burner ground connection.

6+3

On every 6th flame failure during run 

on the same "Call for Heat"

5 minute retry delay, then initiate 

new trial for ignition.

Check gas supply, pilot burner, 

flame sense wiring, contamination 

of flame sensor, burner ground 

connection.

6+4

Flame sensed out of sequence-

longer than 10 seconds

Control waits until flame 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 flame. Replace 

gas control valve if pilot flame 

present. If no pilot flame, 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.

A

Flash 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.

TABLE 5.  CONTINUOUS RETRY MODELS C, M, E AND K ONLY - GREEN LED STATUS CODES