How does Gree Air Conditioning inquire about the warranty period and purchase date?

The date of production of Gree air conditioner can be marked on the side of air conditioner, indoor unit and outdoor unit, followed by the date of manufacture, and the certificate is in the plastic bag sent with the air conditioner for comparison. The certificate also has the date of manufacture, or you can generally fill in the purchase date on the invoice and warranty card. If you can't find it, you can also see the famous brand on the right side of the internal machine and the production date below. And the warranty period of home air conditioner is six years. If the invoice of the warranty card cannot be found, the production date cannot be seen. The general warranty period is out. Let's make the factory number below.