I have a Rinnai RL94 tankless water heater. Today something went wrong and now I have no more hot water.
The machine is not showing any kind of error code like it has in the past when things went wrong, it's still on and (from appearances) seems to be working correctly. I have gas (gas stove works), and I have (cold) water.
What could be causing my lack of hot water?
Best Answer
The user manual for your unit can be found here. According to the document the following are possible when no codes are displayed:
In short, the more likely cause for a unit that's worked before is a lack of flow; either the device isn't getting enough from a clogged filter, or it's not detecting the flow from a failed turbine.
If you can't get anything to work on the controller (set temperature, etc), then it's also possible the power connection has failed or that the controller itself has failed and needs to be replaced.