I woke up this morning to luke warm water. I checked the gas water heater and noticed it wasn't running. I didn't smell gas so I flipped the blower motor off and then back on the pilot lit and began to heat the water. When I got home this evening I realized there was no hot water again and found the same situation as before with the water heater. It's an A.O. Smith Power Shot unit. Any ideas before I call in a professional? Thanks.