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Operating Instructions
70458301ENR6
98
Flame Probe Tests
Unexpected Presence of Flame
The Unexpected Presence of Flame test is performed
when no flame is expected. Failure of this test results
in the ignition control entering Lockout Mode with the
Diagnostic LED displaying Error Code 3.
Flame Monitoring
During the Flame Monitoring test, the flame is
checked to ensure the gas is being burned when the gas
valve is on. Failure of this test will result in the
ignition control entering Lockout Mode with the
Diagnostic LED displaying Error Code 3.
Diagnostic LED (DGN LED)/Error Codes
The Diagnostic LED or DGN LED is located by the
power connector on the ignition control. Refer to
Figure 55
. The Diagnostic LED will indicate the status
of the ignition control. Refer to
Table 24
.
The Diagnostic LED will flash error codes one half
second on and one half second off. Error codes are
separated by a one second pause before the code is
repeated.
LED Color
Description
Orange-Yellow
Initialization
Green
Standby/Normal Operation
Red
Fault Indication Code
Table 24
Error Code
DGN LED status
Fault Type
1
Red
Ignition Control Internal Failure
2
2 Red Flashes
Gas Valve Not Connected
3
3 Red Flashes
Ignition/Flame Sense Failure
4
4 Red Flashes
Reset Switch is Shorted
5
Slow Red and Green Flashes
Low Voltage Detection
6
Fast Red and Orange Flashes
Ignition Control is in Reset Delay
TMB2176N
1
Diagnostic (DGN) LED
Figure 55
1