Getting code 11 alarm. No hot water

[Sim]

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.

 

[Sim]

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.

 

[Diehard]

Call and ask Rinnai what code 11 means.

 

[Jeff Handy]

Does your heater get flushed and de-scaled at the required schedule, which on some heaters is twice a year?

 

[havasu]

Call that plumber back out. Easy peasy.

 

[Diehard]

This looks like a duplicate thread.
https://www.plumbingforums.com/threads/getting-code-11-alarm-no-hot-water.16290/

 

[havasu]

Threads have been merged together.