Installation/Operation Supplement

Ignition Control Operation

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 21. The Diagnostic LED will indicate the status of the ignition control. Refer to Table 3.

LED Color

Description

 

 

Orange-Yellow

Initialization

 

 

Green

Standby / Normal Operation

 

 

Red

Fault Indication Code

 

 

 

Table 3

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.

Error

 

 

 

DGN LED status

 

 

Fault Type

Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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TMB2176N

1Diagnostic (DGN) LED

Figure 21

28

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