ADC AD-310 Service Manual page 43

f. Troubleshooting Flow Chart - Quick Reference...
Does
main burner
remain
lit?
Yes
Does
ignitor spark turn
"OFF" with main
burner flame still
present?
Yes
Control's heat requirements
satisfied.
DSI cycle is complete.
Does ignitor spark continue
with burner flame present?
Third Visual Check
(Does Main Burner Ignite?)
Does
the Flame Probe
have carbon or
No
dust build
up?
Yes
Remove Flame Sensor
Assembly.
Clean the surface of the
Flame Sensor Rod with
fine steel wool or emery
cloth, then reinstall.
Energize system and
check for proper operation.
No
Reposition Flame Sensor Probe to achieve a
2µa or greater sensor current or, if
unattainable, replace the Sensor Probe
Assembly.
No
Yes
Replace
Yes
DSI Module
3 9
De-energize
the system and disconnect
Flame Sensor from the
DSI Module. Connect an ohmmeter
across the Flame Sensor
Sensor and ground.
Is resistance less
than 50 mega-ohms?
No
Connect
ohmmeter across
Flame Sensor lead
terminal and Flame Sensor.
Does continuity
exist?
No
Replace Flame Sensor
Assembly.
Energize system and check
for proper operation.
Is
DSI Module "GND"
terminal properly
connected to
ground?
No
Correct
ground wiring
Is
Flame Sensor Probe
properly located in the flame?
Proper flame location would
provide adequate flame current
yet will not exceed maximum rod
temperature. Microammeter
reads 2µa or
greater.
No
Yes
Yes