If your pool heater is outdoors in a high wind area, the wind might be blowing it out. In some cases you can solve this by installing an outdoor vent cap to extend the distance from the end of the exhaust and the combustion chamber.
Answer:
try changing the "thermocoupler"( not sure of the spelling) The piolit light heats the thermocoupler. looks like a little metal rod that sits above or right next to the piolit light. when the thermocoupler is heated it produces a millivolt of electricity the power it produces is what keeps the gas vaulve open. this is a safety feature, if the piolit light goes out the gas will shut off so that the house does not fill with gas. This is why when you light the piolit you must manually hold the button in until the thermocoupler heats up. Gas appliances should only be worked on by licienced pros, don't risk the lives in your house in order to save a few bucks.
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First answer by User:Patrickh. Last edit by User:Patrickh. Contributor http://wiki.answers.com/help/trust_points: 4 [recommended]. Question http://wiki.answers.com/help/question_popularity: 1 [Why_does_your_gas_fireplace_go_out_after_about_2_hours_of_use]
There is a device called a thermocouple that the pilot light flame touches. It senses if there is no flame, and turns off the gas. They go bad- have yours replaced.
Check to see if you pilot light is lit
Most likely your pilot light is out
Problem with plug shorting?
There could be a draft causing the pilot light to go out.
It depends on which way the wind is blowing. Because if the wind is blowing into the side of the plane then the pilot has to fight against the wind just to keep the plane on course.
Are both your brake lights blowing out? If it affects only one light: it could be a bad light socket, or a pinched or frayed wire that is shorting out.
Loose wiring. Improper connection.
Spillage
short in electrical circuit
If holding the controls in the LIGHT position for about 15-30 seconds does not keep your pilot lit, there is probably a problem with the thermocouple. That is the small tube that the pilot flame touches. Be sure it is not bent, and being missed by the pilot flame. They do go bad, and require replacement.
Check your instructions, Usually you have to keep it on pilot mode for 30 seconds then you should be able to turn it to on without the pilot flame going out.
You likely have a short circuit in the rear light harness somewhere.