SECTION 13: TROUBLESHOOTING
13.3 Troubleshooting for Flame Supervision System
To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter reads negative values, then reverse the test leads.
START
Connect a DC ammeter in series with the flame probe.
Is the flame present and at least 1 μA DC flame current?
Yes
Is there a current flowing in the flame probe circuit with no flame present?
No
Does “lockout” occur when there is a flame present?
No
Heater Operating
TROUBLESHOOT ENDS.
No
Yes
Yes
No
Use General
Troubleshooting section to
trace the fault.
Is the connecting lead
damaged? Is the flame probe damaged or touching earthed components?
Is inlet burner gas pressure correct? Is live and neutral polarity correct? Is
flame probe circuit correct?
No
Repair or replace as
necessary.
If problems persist, contact
Repair or replace as
Yes necessary.
Yes Replace ignition control.
NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current
29
