Without the model number of the heater it is hard to give an accurate answer but I will give you some suggestions.
I would start with cleaning the pilot ODS assembly.
http://www.msservice.net/ts/reseat_thermo-clean_pilot-ODS.htm
I would check the regulator on the heater...if it is propane these gas get raw gases in the regulator and cause the unit not to pressure up correctly.
Give these items a try first before replacing any parts.
Thanks
M Cramer
www.allpartsinc.com
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