Dose the heater have a free standing pilot? Meaning you turn the gas valve knob to pilot position and push down and light the pilot. If so then there is a therm o coupling sticking up when the flame hits it for a min or two and this is what sends a signal back to the gas valve letting it know that a pilot flame is present. If the therm o coupler is bad it will not let the pilot stay lit. also see where the other end of the therm o coupler screws into the gas valve back it out and clean the end up and install it back. Now if it is electronic pilot and the pilot fires and then goes out there is a rod that is in line whit the pilot acts the same as a therm o coupler replace it. if you send me the Model number and make of unit i will be able to help you better.
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