Getting code 11 alarm. No hot water

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Sim

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Mar 10, 2020
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Location
Texas
Hello,
I have no hot water in shower or sink.
There a code 11 in the rinnai hot water heater. I had a plumber look at it and he changed the gas system regulator but it worked for less than 24hrs and went back to the same thing. When i turn on the hot water, only cold water comes out and an alarm on the rinnai system goes off.
Help plz. Im new to this and im not a handy person.
 
Hello,
I have no hot water in shower or sink.
There a code 11 in the rinnai hot water heater. I had a plumber look at it and he changed the gas system regulator but it worked for less than 24hrs and went back to the same thing. When i turn on the hot water, only cold water comes out and an alarm on the rinnai system goes off.
Help plz. Im new to this and im not a handy person.
 
Does your heater get flushed and de-scaled at the required schedule, which on some heaters is twice a year?
 

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