Inspected unit found thermocouple burnt our and very rusted heat exchanger. Recommended to due to the extremely rusted heat exchanger to perform a combustion analysis to unit. Replaced thermocouple and performed combustion analysis to unit. Found 1 ppm at furnace also at the duct supply which mean co is going into the house. Highly recommend to replace unit to avoid any other issue down the road due to the unit being from 1990.
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