I am a highly skilled home service professional. I recently completed a furnace repair job for a customer. The customer's furnace was not producing heat, so I diagnosed the issue as a faulty heat exchanger and collector box. I replaced the defective parts and tested the furnace to ensure it was working properly. The customer paid me the agreed-upon price, and I provided them with a warranty for the repairs. I also explained to the customer how to maintain the furnace and prevent future issues.
