Operating Instructions

System Tests

The following system tests are performed during normal operation. System tests are performed at a minimum of every 24 hours.

Low Voltage Detection

If the voltage between terminals TH and GND on the control is below 18.75VAC +/- 0.75VAC for more than 3 seconds the ignition control will turn off the gas valve and will not attempt to spark. The Diagnostic LED will display Error Code 5. The ignition control will not enter Lockout Mode if a low voltage condition is detected, but will enter Standby Mode and wait for the low voltage condition to be cleared.

If the voltage between terminals TH and GND on the control rises above 19.75VAC +/- 0.1VAC for at least 3 seconds, the ignition control will then enter Start Up Mode.

Low Voltage Detection test is disabled during Run Mode.

Gas Valve

The ignition control verifies that the gas valve is connected. Failure of this test results in the ignition control entering Lockout Mode with the Diagnostic LED displaying Error Code 2.

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 8. 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 8

20

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