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.
52