Alliance Laundry Systems Drying Tumbler User Manual

70400101

14

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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.

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.

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. 

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. 

The Diagnostic LED or DGN LED is located by the 

power connector on the ignition control.  Refer to 
Figure 5

. The Diagnostic LED will indicate the status 

of the ignition control. Refer to Table 1.

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.

Orange-Yellow

Initialization 

Green

Standby / Normal Operation

Red

Fault Indication Code

Table 1 

Red 

Ignition Control Internal Failure

2 Red Flashes

Gas Valve Not Connected

3 Red Flashes

Ignition/Flame Sense Failure

4 Red Flashes

Reset Switch is Shorted

Slow Red and Green Flashes

Low Voltage Detection

Fast Red and Orange Flashes

Ignition Control is in Reset Delay

TMB2176N

Diagnostic (DGN) LED

Figure 5