System Tests; Diagnostic Led (Dgn Led)/Error Codes - ALLIANCE CA050L Installation Operation & Maintenance

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
Orange-Yellow
Green
Table 17 continues...
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Description
Initialization
Standby/Normal Operation
LED Color
Red
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
1 Red
2 2 Red Flashes
3 3 Red Flashes
4 4 Red Flashes
5 Slow Red and
Green Flashes
6 Fast Red and Or-
ange Flashes
1. Diagnostic (DGN) LED
89
Operating Instructions
Description
Fault Indication Code
Table 17
DGN LED
status Fault Type
Ignition Control
Internal Failure
Gas Valve Not
Connected
Ignition/Flame
Sense Failure
Reset Switch is
Shorted
Low Voltage De-
tection
Ignition Control is
in Reset Delay
TMB2176N_SVG
Figure 62
Part No. 70457901ENR12
1