The presence of hard water causes sediment build-up, which is a common problem with Rinnai water heaters. The scale build-up inside the heat exchanger causes error code LC0-LC9 on the remote control. Bath fill problems display error code 03 on the unit control.
To fix some common problems, the user should confirm that the pipes are of proper sizes, ensure the water heater is using the correct gas type, and check the length of the venting system. Users can troubleshoot the problem using the error codes. However, some error codes can only be addressed by an expert. It’s advisable to get a licensed technician for Rinnai troubleshooting. To enjoy proper functioning and longevity from the water heater, professional installation, maintenance and regular cleaning are crucial.