I’ve been having this problem for about 3 months now. When the water heater is turned on the blower starts running, the pilot lights up but the burner does not ignite. It goes through two ignition cycles and then stops trying to ignite, the blower continues to run until turned off. Does this water heater have a thermocoupler that is malfunctioning, or is it that the main gas valve is not allowing gas to get to the burner? Or is it something else entirely?