A gas supply problem or a control problem.
Pressure switch hot water tank.
What is the air pressure switch.
Square d by schneider electric 9013fsg2j24m4 air pump pressure switch nema 1 40 60 psi pressure setting 20 65 psi cut out 15 30 psi adjustable differential low pressure cut off.
Water worker 119 gallon vertical pressure tank.
The water heater is too small for the demands put on it.
Item 424503 model ht119b.
For example if your well pump pressure control switch is set to cut in start pumping water from the well at 30 psi then set the pressure tank to 30 2 28 psi.
The air pressure switch is the element used on all power vent models and it checks that there is proper venting removal of the products of combustion.
Bleed air pressure out of the water tank or add air pressure into the water tank until the tank pressure is at the desired set pressure.
If there is not enough water coming out you might be dealing with one of these issues.
There is some water pressure but not much.