Rinnai tankless hot water heater problem

Is there anything I can do to fix this hot water heater on my own? I am trying to avoid having to call a repairman

I live in a pretty new home, built in 2016 and has a Rinnai tankless hot water heater (RL75i to be exact). It runs on natural gas. Just yesterday I noticed Ice cold water when the hot tap was open on a sink and then today the same issue happened and also was cold in the shower.

We tried turning the unit on/off, unplugging, even reset the breaker on the power outlet the unit is on and tried changing it to a totally separate outlet. I also tried turning the hot and cold water valves off/on again thinking all of this would maybe reset and “wake it up”. After doing this, we turned on the hot water and it came out hot for just a few seconds and the unit started beeping with code #11.

A quick google search says that Rinnai error code 11 is an indication that there is no ignition in, or no gas supply to your hot water system. It suggests checking to see if your hot water system has any visible damage or loose parts and to locate your gas supply and ensure it is turned on. I can’t imagine either of these are the case. No obvious damage and no one has tampered with the unit at all.

I’m kind of at a loss... any ideas?

submitted by /u/Monsoon2727
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