Rinnai Tankless Waterheaters

Jim_27

Rinnai Tankless Waterheater and Calcium buildup

Solutions and any thoughts you may have

Jack

First of all

check the installation manual for the limits of different chemicals in the water. Best done before installation with a water test. Get a water test so you know what you are dealing with.

If you are getting an "LC" (lime control) error code, then you need to flush the hx. This is a pretty simple process if piped according to the instructions. White vinegar is typically recommended. Make sure when you flush that you also clean the immersion sensor at the top right of the hx. If it is not cleaned it will be coated and can still give an LC code after flushing. It is the sensor held by the two small phillips head screws. When you pull the sensor, be aware that there is a very small o-ring on the sensor which if lost can alter your happiness quotient. I am very sure about that! That o-ring will sometimes stay on the snesor when pulled or sometimes stay in the well. If it stays in the well, pull it and install it on the sensor for reassembly. If you try to install the sensor with the o-ring in the well you can possibly refer to the alter happiness thing above. Do not back flush, as in reverse flow as it will screw up the turbine.

If you have bad water you can wither put this on a schedule to clean or treat the water.