If yours has an ODS pilot light, dust can get into the safety portion causing it to shut down thinking the oxygen is too low in the room. I use rust buster to flush the pilot without harming it. It has a long spout on it and that makes it easy to reach inside the heater.
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If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61
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If yours has an ODS pilot light, dust can get into the safety portion causing it to shut down thinking the oxygen is too low in the room. I use rust buster to flush the pilot without harming it. It has a long spout on it and that makes it easy to reach inside the heater.
More Here
If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61