MAINTENANCE
6-19
Check for the following during the reading:
• Measure the voltage in µA between the flame rod and the flame connector. If the flame senser is
operating correctly, the reading will be between 3.4 µA and 12.0 µA. If there is a lower voltage
reading or no voltage, check to make sure that the wires from the control module to the flame-
sensing rod are correctly connected and ensure the the flame rod or the wire connected to it is
grounded properly.
• If the reading is still too low, ensure that the flame rod and burner are clean and free of dust, dirt,
or debris. If they are not, take them out, clean them, and reinstall. Cleaning removes impedance
from the current circuit and thus should increase the flame current.
• If a low reading is still observed, replace the flame-sensing rod. A new flame sensing rod should
now produce the correct measurement. However, if an acceptable measurement is still not
observed, the problem may lie in the controller.
• Chassis grounds on the shell and on the back of the C-More controller should be checked for
continuity. Resistance must not exceed 1 Ω (ohm) on any ground attached to the heat exchanger
and the C-More controller.
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