Orion System MODGAS-XWR - Manual (Page 20)

TROUBLESHOOTING
MODGAS-XWR Technical Guide 20
LED Diagnostics
LED Diagnostics
The MODGAS-XWR Controller is equipped with LEDs that can be
used to verify operation and perform troubleshooting. There are LEDs
for communication, operation modes, and diagnostic codes. The module
has 14 LEDs—12 used for operation & status, and 2 used for alarms.
See Figure 10 for the LED locations. The LEDs associated with these
inputs and outputs allow you to see what is active without using a volt-
meter. The LEDs and their uses are as follows:
Operation LEDs
POWER - This green LED will light up to indicate that 24 VAC power
has been applied to the controller.
STATUS - This green LED will light up and blink the board address at
startup. It will then blink every 10 seconds according to what mode the
controller is in. See Table 3.
No. of
Blinks
STATUS LED
1 Off Mode
2 Heating Mode (Heat Enable
Signal and No Alarms)
3 SAT Fail Mode
4 SAT Cutoff Mode
Table 3: STATUS LED Blink Codes
Diagnostic LEDs
ALARM - This red LED located on the MODGAS-X Controller’s cover
above the LCD display will light up to indicate an alarm. The type of
alarm(s) will be shown on the LCD display. The ALARM LED also
blinks when the expansion valve is initializing at startup.
The ALARM LED on the MODGAS-X board will blink an alarm code
every 10 seconds when an alarm(s) occurs. The highest priority failure
code will be indicated fi rst. You must correct the highest priority alarm
before other problems will be indicated. See Table 4.
No. of
Blinks
ALARM LED
(Blinks every 10 seconds)
1 Valve 1 Not Detected
2 Valve 2 Not Detected
3 Valve 1 Proof of Flame Failure
4 Valve 2 Proof of Flame Failure
5 SAT Not Detected (Stand-Alone
Mode)
6 SAT Cutoff
7 Communication Failure
Table 4: ALARM LED Blink Codes
Communication LED
COMM - This yellow LED will light up and blink when communica-
tions are detected.
Relay LEDs
RLY1 - This green LED will light up and stay lit as long as the Fan
relay is active.
RLY2 - This green LED will light up and stay lit as long as the Low
Speed Fan relay is active.
RLY3 - This green LED will light up and stay lit as long as the Heat
Enable 1 relay is active.
RLY4 - This green LED will light up and stay lit as long as the Heat
Enable 2 relay is active.
Binary Input LEDs
AUX BIN - Not Used.
HEAT EN - This green LED will light up when Heat Enable signal is
activated.
PO-IGN1 - This green LED will light up when the Proof of Flame input
from the fi rst Ignition Module is enabled.
PO-IGN2 - This green LED will light up when the Proof of Flame input
from the second Ignition Module is enabled.
Analog Output LEDs
GAS VALVE 1 - This green LED will blink when Gas Valve 1 is
modulating or commanded to modulate. LED will stay solid if valve is
detected and status is good.
GAS VALVE 2 - This green LED will light up when Gas Valve 2 is
modulating or commanded to modulate. LED will stay solid if valve is
detected and status is good.