There is a small adjustment screw on the gas valve,turn it clockwise to increase pilot,if that does not work the vent cap on the gas regulator on the back of the unit could be stopped up,remove that cap ,clean out or replace unit can operate without it just fine.If you increase the pilot and it still wont stay lit replace the thermocouple
Pilot light will not stay lit
Pilot is lit and stays lit until you turn the gas valve on then the pilot goes out
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pilot not holding
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