Remove the bar and the chain to check if the noise is related to the engine or the cutting equipment.
The problem is engine related and should be further investigated by the dealer.
The most effective way to get personal assistance is to contact your Husqvarna local dealer.
Troubleshooting, service, products, parts, warranty, and general assistance are carried there by authorized and trained technicians.
They have abundant experience with the most common local machines, regulations, vegetation, and with specific terrain and weather conditions in your area.