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 9. The Diagnostic LED will indicate the status of the ignition control. Refer to Table 5.
LED Color | Description |
Initialization | |
Green | Standby / Normal Operation |
Red | Fault Indication Code |
| Table 5 |
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 |
1 |
TMB2176N |
1Diagnostic (DGN) LED
Figure 9
70400101 (EN) | © Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT | 19 |