Posted by missouri massey man on February 25, 2014 at 05:49:22 from (108.90.234.133):
In Reply to: Furnace Ignitor posted by IH2444 on February 24, 2014 at 13:37:30:
Quoting Removed, click Modern View to see
What the flame sensor is performing is called "flame rectification". The boards circuit is completed to "ground" actually THROUGH the flame. If there is any corrosion or oxidation on the flame sensor, it will inhibit the sensors ability to "prove" the passage of the ground signal to the ignition (or control board) device resulting in flame failure. Typically after three flame failures, it will throw a code and lock out requiring repair or at least manual reset. Many times, only the spade clip connection (on those that have a spade clip connection) become unable to pass the signal. Slipping it on and off a few times makes it work, but cleaning with a touch of sandpaper is much better. At the same time clean the sensor in the same manner.
A faulty connection should not cause the ignitor to stay in the circuit longer because there is in most manufacturers a specific time through the circuit board they are energized. That time frame is typically 30 seconds BEFORE the gas valve is energized. Usually then and only then will the gas valve be energized for usually not longer than a three second period, followed by a "post-purge" cycle to vent the heat exchanger before attempting a retry for ignition if it experienced a "no sense" condidion.
The faulty connection WILL cause the ignitor to (in theory) have a shorter life because as with anything they only have so many cycles in them before failure.
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