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f. Troubleshooting Flow Chart - Quick Reference...
Third Visual Check
(Does Main Burner Ignite?)
Does
main burner
remain
lit?
Does
the Flame Probe
have carbon or
dust build
up?
Reposition Flame Sensor Probe to achieve a
2µa or greater sensor current or, if
unattainable, replace the Sensor Probe
Assembly.
Correct
ground wiring
Control's heat requirements
satisfied.
DSI cycle is complete.
Replace Flame Sensor
Assembly.
Energize system and check
for proper operation.
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?
Does
ignitor spark turn
"OFF" with main
burner flame still
present?
Does ignitor spark continue
with burner flame present?
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.
Yes
Yes
Connect
ohmmeter across
Flame Sensor lead
terminal and Flame Sensor.
Does continuity
exist?
Is
DSI Module "GND"
terminal properly
connected to
ground?
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.
Replace
DSI Module
No
No
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes