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I am a factory trained and certified repair and installation technician for Rinnai, Takaghi, Noritz, Bosch, and Navien. Judging by your error code I'm guessing its either a Rinnai, Takaghi, Or Noritz. Can you give me a model number please?
Excellent Rheem actually on makes tank style water heaters. They buy Takghi's and rebrand them.
Error code 11 is no ignition. Is this a brand new install? Never has worked?
Gas valve I assume is on? Have you purged the gas line?
You should purge it as close the the water heater as possible and until you smell the gas. Is it a natural gas unit?
Can you hear the clicking of the gas solenoid valves? You should hear it after the fan comes on. Also can you hear the ignitor sparking?
Does this model have a sight window for viewing the flame?
Did you ever turn the gas off at the meter?
If so make sure its on. Turning it on too quickly can cause it to lock up. If that happens turn it back off bleed the line then slowly turn it back on.
Are you still needing help? Or did one of my suggestions fix it?
Can you prove the outlet it is plugged into is properly grounded?
Are you still needing help?