f. Troubleshooting Flow Chart - Quick Reference...
Third Visual Check
(Does Main Burner Ignite?)
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.
No
No
Does
the Flame Probe
have carbon orNo 
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.
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
No
Connect
ohmmeter across Flame Sensor lead terminal and Flame Sensor. Does continuity
exist?
No
Yes
Does ignitor spark continue |
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with burner flame present? |
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| Replace |
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| Yes | ||
| DSI Module |
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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.
Yes
Reposition Flame Sensor Probe to achieve a |
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2µa or greater sensor current or, if |
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| No | |
unattainable, replace the Sensor Probe |
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Assembly. |
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