Hi there. This is probably not your usual Rinnai code 12 post.... I have a Rinnai V75IP propane tankless hot water heater that I bought new 3 1/2 months ago, in June. I hired a …

Error code 12 on a Rinnai gas heater indicates ignition failure. Check the igniter for cracks or damage and ensure the flame sensor is clean and properly aligned.

I have a Rinnai tankless water heater that is about 3.5 years old. It's recently started intermittently throwing a code 12.

It has a Rinnai RL94 tankless water heater that consistently faults (error code 12) when there is a sudden demand for hot water, such as when someone turns on the hot water quickly instead …

Rinnai RHFEFA-P errors out w/ 11 or 12 code. Most often when the flash water heater runs, but not always. Flash water

The installer increased the line sizes, checked all the regulators, and I personally checked the pressure coming into the unit and get a solid 12.69 inches of water column, which in the …

Rinnai told our plumbers that the flu was installed incorrectly as it was installed for a non-condensing unit, but ours is a condensing unit. Great, we replaced the flu with the correct parts.

We paid $1000 so far to fix an error code 12 on our Rinnai R53 tankless hot water heater. They cleaned the inlet screen,

Both of her yourself because the code 12 is one of those things that can be caused by tons of different issues! As well as the link I will send you Rinnai technical support number.

Hi, I have a Rinnai water heater (RUC80i) that worked fine for 5 years but trouble started right after the 5-year mark. It is 5 years and 6 months old now.