29
■
Troubleshooting
If a problem occurs, remove the front cover of the controller. Determine the operat-
ing state of the controller and type of trouble by checking the start check, POWER
and FLAME LED display states. The start check LED is located in the center inside
the cover, and the POWER and FLAME LEDs are located on the front display.
❍
LED out
●
LED lit
* To check if the controller is operating correctly, apply a flame signal input to the controller by using a flame
simulator. Make sure that 2K relay is turned ON and the FLAME LED is lit.
Chapter 4. MAINTENANCE AND INSPECTION
POWER
Start check LED
FLAME
Results
Remedy (check items)
LED
LED
Before
The power is not ON.
Check panel power switch and
startup,
❍
❍
❍
wiring.
terminal 7
OFF
After startup,
The flame is being
terminal 7
●
●
●
detected. (normal
-
ON
operation)
The flame has not
Check flame detector, burner,
●
●
❍
been detected.
flame relay, valves, ignition
transformer and flame relay.
*
●
❍
●
False flame
Check burner flame, flame detector
and flame relay.
*
●
❍
❍
1K relay is not ON.
Check power supply at operation
input terminal (7). Check flame
relay.
*
