Here are some troubleshooting steps to follow if you're having issues with your gas fireplace:

1. Check that the gas supply valve is turned on. The valve is typically located on the gas line leading to the fireplace.

2. Verify that the pilot light is lit. The pilot light is a small flame that ignites the gas when the fireplace is turned on. If it's not lit, follow the instructions in the owner's manual to relight it.

3. Check the thermostat or remote control. Make sure it's set to the "on" or "heat" position and that the temperature is set to a desired level.

4. Inspect the burner and logs. Make sure they are positioned correctly and that the burner ports are not clogged with debris or dust.

5. Check the fan. If your gas fireplace has a fan, make sure it's operating properly. If it's not turning on, there may be an issue with the fan switch or motor.

6. Inspect the venting system. Make sure that the venting system is clear of any debris or obstructions that could prevent proper airflow.

7. Check for any gas leaks. If you smell gas, turn off the fireplace and contact a professional immediately.

8. If none of these steps resolves the issue, it may be time to contact a professional technician for assistance. They can diagnose the problem and make any necessary repairs.

Remember, it's important to always follow safety precautions when troubleshooting a gas fireplace. If you have any doubts or concerns, don't hesitate to contact a professional for help.