enter Standby Mode. During Lockout Manual Reset, the Diag-
nostic LED on the ignition control flashes red and orange, and the
Reset Light remains on until the ignition control is reset. After
the Reset Light turns off, stop pressing the switch. Holding the
reset for three seconds after lockout has been cleared will cause a
fault and result in entering Lockout Mode again.
System Tests
The following system tests are performed during normal opera-
tion. 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 igni-
tion control will turn off the gas valve and will not attempt to
spark. The Diagnostic LED will display Error Code 5. The igni-
tion control will not enter Lockout Mode if a low voltage condi-
tion 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 ris-
es above 19.75VAC +/- 0.1VAC for at least 3 seconds, the igni-
tion 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. Fail-
ure of this test results in the ignition control entering Lockout
Mode with the Diagnostic LED displaying Error Code 2.
Flame Probe Tests
The Unexpected Presence of Flame test is performed when no
flame is expected. Failure of this test results in the ignition con-
trol 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.
Diagnostic LED (DGN LED)/Error Codes
The Diagnostic LED or DGN LED is located by the power con-
nector on the ignition control. Refer to
Figure 62
. The Diagnos-
tic LED will indicate the status of the ignition control. Refer to
Table 17
.
LED Color
Description
Orange-Yellow
Initialization
Green
Standby/Normal Operation
Table 17
continues...
LED Color
Description
Red
Fault Indication Code
Table 17
The Diagnostic LED will flash error codes one half second on
and one half second off. Error codes are separated by a one sec-
ond pause before the code is repeated.
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 De-
tection
6
Fast Red and Or-
ange Flashes
Ignition Control is
in Reset Delay
TMB2176N_SVG
1
1.
Diagnostic (DGN) LED
Figure 62
Operating Instructions
©
Copyright, Alliance Laundry Systems LLC -
DO NOT COPY or TRANSMIT
89
Part No. 70457901ENR12
Summary of Contents for YU050E
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