Identify the appliance
Have the model plate ready. Cleaning, log placement and component tests depend on the appliance instructions.
Check the burner and ignition
The service scope should name the pilot, burner and relevant ignition checks. Thermopile output can be measured; replacing a valve by guesswork is not a diagnosis.
Check the exhaust path
Venting and spillage checks depend on the system type. Follow the manufacturer’s service schedule and arrange a check when operation changes.
Keep the licensed scope clear
Gas piping and line alterations are coordinated with a licensed plumber under permit. If you smell gas now, leave and contact the utility or emergency services from a safe place.
Further reading: Texas State Board of Plumbing Examiners, Texas Railroad Commission — propane licensing.
This guide explains the service. The appliance instructions, site conditions and applicable local requirements determine the work.