The units have two led lights that provide troubleshooting codes in the form of flash patterns led codes on a lennox 80mgf furnace by anna assad. I have an error code flashing on the control error code flashing on lennox to go in to retry mode which the controller says the led will flash every . These are york error codes york furnace error codes are seen in three colors red green and amber yellow each color will also flash a specific number of times to
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