That would depend on which heater model.
I prefer the Raypak. I have had far less problems with this brand than all others in the last 25 years.
High winds, pilot generator. Is the heater located next to a wall? Is the heater door closed? Does the heater have a draft hood or what they call a stackless heater? Ken
Have you turned the control from Pilot to On? Have you increased the temperature setting?
Hayward is a very popular brand of swimming pool heater. Raypak and Max-E Therm are other popular brands.
Thermocouple. Keep pilot knob depressed for 30 seconds after lighting pilot.
If the pilot light is on, the heater should come on by itself. If the pilot light is off then it has to be lit. If it will not stay on, the thermocouple is bad.
Gas not turned on to water heater. Gas valve on water heater not set to pilot setting. Faulty gas valve. Igniter for lighting pilot not working.
My central heater will not come on while the pilot is lit,The heat does not kick on.
Hot air balloons have a gas heater that is generally powered by propane. When the pilot turns the heater on, the balloon will fly high due to the hydrocarbon chamber that allows the pilot control of ascent and descent of the hot air balloon.
You don't. If the heater has an electronic spark, then it doesn't have a standing pilot to light. The spark lights the pilot when there is a call for heat, which in turn lights the burners. If the heater is on and the pump is RUNNING, the heater should light automatically when the water temperature is lower than the heat setting.
Gas water heater has an orifice for main burner and for pilot light, if not electronic ignition.