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The best approach first would be to blow out the dust. There are one to two breather ports that easily get clogged. If that doesn't work it may be a bad thermocouple. It can be checked with a volt meter set to multicolored. Disconnect the thermocouple from the valve and attach the black lead to the thermocouple itself and the red to only the tip that makes contact inside the valve. Light the pilot and hold in button to begin watching the readings. 18-24 millivolts is the desired range.
at first i thought this was a bad flame rod but the fact that it burns on low and not on high tells me that it is not getting enough gas since it burns less gas on low. there will be a tap on the burner side of the regulator, take off the cap and turn the screw clockwise to increase the gas pressure. do this in small amounts until it corrects the problem. If you have or can get a manometer, the gas pressure should be set to @7 inches of water column
Do you have the serial number or the manufacture date? There are some design changes and I would need to know the year of manufacture to assist accurately. Usually it is a relay or the thermocouple connection that will affect the unit staying lit.