Treitz28
New Member
Hi all - new here, and trying to isolate a problem with our tankless water heater - Rinnai R53.
The issue: When using the shower or sink, it producing hot water for a while. However, occasionally it will go cold (NOT showing an error code). If we turn the water off, then back on, it heats up quickly again. It may do this 1 - 3 times per shower.
I talked to a plumber who thought it may be a water flow issue. He suggested trying to turn a sink on when it does it to increase water flow. This did not change anything.
I'm not a plumber, so happy to have someone service it, but I'd like to point them in the right direction rather than paying a large bill for diagnostic if possible.
Appreciate any insight.
The issue: When using the shower or sink, it producing hot water for a while. However, occasionally it will go cold (NOT showing an error code). If we turn the water off, then back on, it heats up quickly again. It may do this 1 - 3 times per shower.
I talked to a plumber who thought it may be a water flow issue. He suggested trying to turn a sink on when it does it to increase water flow. This did not change anything.
I'm not a plumber, so happy to have someone service it, but I'd like to point them in the right direction rather than paying a large bill for diagnostic if possible.
Appreciate any insight.
