Inspected all electrical circuits along with all safeties and limits. Also inspected gas pressure along with condition of burners. Inspected ignition components as well , customer has recently replaced air filter. Performed combustion analysis and found furnace operating above permissible safe conditions. CO levels inside flue piping are above 700 ppm and also found a maximum of 3 ppm inside of supply duct on furnace. This unit is past life expectancy and due to age and combustion analysis this unit should be replaced. Left power to unit off as well as gas shut off. Disconnected solenoid wiring on gas valve as well as inducer motor line voltage. Unplugged interlock switch circuit and secondary power on transformer to control board.
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