Upon inspection, the unit was not heating. I removed the door to investigate further and discovered a significant accumulation of water and rust, likely originating from the secondary heat exchanger. After thorough examination, it was determined that the root cause was a faulty gas valve. Given the extensive water and rust damage, which compromises the unit's integrity, I advised the customer that the best course of action would be to replace the unit. The customer agreed and signed the estimate for a Goodman replacement unit, scheduled for installation tomorrow.
