Toby arrived at home to evaluate the homeowners 50 gallon propane power vent water heater. This unit is a 2018 install ao smith. This unit was not installed by Spartan Plumbing. Currently the unit is still under a part’s warranty. The homeowners have had trouble with this unit running out of hot water. There is only two people living in the home. After they noticed this they had found that there water heater is experiencing short cycling. When the unit needs to heat up the igniter will light the burner assembly for a couple seconds then turn back of. This cycle will continue until eventually it will light and stay lit in the normal operation. Before this unit does return to normal operation the unit does display a code of 6-3 flashes. Toby contacted AO Smith tech support with information regarding this heater. The tech support recommends a replacement of the igniter and flame sensor. Both parts being under warranty. Toby replaced both warranty water heater parts and tested unit. Unit