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York 90 furnace\r\n\r\nindicator light is blinking 7 times the code shows a lock out due to no ignition but the furnace is igniting do I need a new control board ? or is there a less expensive fix? oh I have removed the ignition sensor and sanded it, and replaced it with no sucess

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I believe you may have sanded the thermocouple, the sensor is usually a flame sensor and it will be round and look like a button. These will get dirty and not see the flame, you can try cleaning it with a soft cloth and glass cleaner once you locate it. This piece sends signal to the board letting it know there is flame. It should have wires that head to the board and plug in.

Posted on Dec 29, 2010

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