Pilot outage is a frequent problem with the new type water heaters. I'm attaching the instructions to light the pilot. For flame and pilot outage the 2 most common reasons are a stopped up air vent or arrester. You can check and clean the air vent but a technician will be required to clean the arrester which is located under the burner assembly. Listed below are the main reasons for frequent pilot outage:
Clogged air intake screen(s) or flame arrester
Insufficient combustion / ventilation air supply
Improper vent system design or operation
High ambient air temperature (115 F or more)
A clean water heater and water heater environment are the first things that should be considered when troubleshooting a FVIR water heater for pilot outage. Government regulations for higher efficiency and new flammable vapor ignition resistance requirements have made todayâ€™s water heaters more sensitive to the need for proper air flow around and through the appliance. A dirty environment can affect a water heaterâ€™s performance. Take time to make sure that the area around, and under the heater is clean and obstruction free. Make sure that the air intake screen(s) (LDO screens) located on the base ring of the heater are clean and properly installed; this is where all of the combustion air enters the heater. Regularly cleaning the screen and keeping dust and debris from around the heater could possibly save a costly service call.
I recommend having a technician check your water heater. If not adjusted properly, an improper flame or vent system could be very dangerous. I'm listing a site you can access to have a tech come out. Here is a link for the website:
Sears Home Services