Trial for Ignition
C
all fo
r H
eat
Is there a
spark across gap at
ignitor?
Does gas
ignite?
Is there minimum
flame current at the
flame sensor?
Is there
minimum flame current
at the control
module?
Replace control
module.
Check connections to flame
sensor and/or moisture in the
burner assembly.
Is the flame
sensor corroded?
Clean flame
sensor.
Is the sensor
located in flame
correctly?
Replace flame
sesnsor.
Reposition
flame sensor.
Is gas
flowing?
Is the ignitor
position correct in the
gas flow?
Check gas pressure
and supply voltage.
If either are low,
correct and repeat
startup.
Reposition
spark ignitor.
Is there
24VAC at the gas
valve?
Is there 24VAC
from gas valve output on
control module to
chassis?
Check wiring and
connections to
gas valve.
Replace
ignition
control
module.
Replace gas
valve.
Is there
spark voltage at
control?
Check high
voltage wire
continuity.
Is there 24V P1-2
to power control?
Replace
control
module.
Check wiring
and/or 24VAC
transformer output.
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
YES
NO
YES
NO
YES
NO
12.3
Troubleshooting
DSI Integrated Control Module (Circuit
Board) Trial
Troubleshooting
Flowchart
The integrated circuit board monitors the operation of the heater and
includes two LED signal lights that indicate normal operation and various
abnormal conditions. If the heater fails to operate properly, check this sig-
nal to determine the cause and/or to eliminate certain causes. LED is vis-
ible through the door. See operating sequence in Paragraph 10.
Do not attempt to repair the DSI integrated control module (circuit board);
the only field replaceable component is the fuse.
Check the Lights on the
DSI Integrated Control
Module (Circuit Board)
IMPORTANT:
When using
a multimeter to troubleshoot
the 24 volt circuit, place the
meter’s test leads into the 5
or 9 pin connectors located
on the ignition control. Do
not remove connectors or
terminals from the electri-
cal components. Doing so
can result in misinterpreted
readings due to the ignition
control board’s fault mode
monitoring circuits.
Control Status - Green LED Codes
Steady ON.........Normal Operation, No call for heat
Fast Flash......... Normal Operation, Call for heat
1 Flash.............. System Lockout, Failed to detect or sustain
flame
2 Flashes.......... Pressure Switch Did Not Close within 30 Seconds
of Venter Motor
3 Flashes.......... High Limit or Vent Temperature Limit Open
4 Flashes.......... Pressure Switch is Closed Before Venter Motor is
Energized
Steady OFF........Blown fuse, No Power, or Defective Board
Flame Status - Yellow LED Codes
Steady ON........ Flame is sensed
Slow Flash........ Weak flame (current below 1.0 microamps ± 50%)
Fast Flash......... Undesired Flame (valve open and no call for heat)
Form I-UEAS, P/N 221232 R6, Page 47
