Dealing With Rinnai Tankless Water Heater Error Code 10

Seeing a rinnai tankless water heater error code 10 flash on your screen usually happens right when you've got a head full of shampoo and the water suddenly turns ice-cold. It's a total bummer, but it's actually one of the more common issues these units run into. Essentially, your water heater is telling you that it's having a hard time "breathing." Whether it's not getting enough fresh air in or it can't push the exhaust fumes out, the system shuts down as a safety precaution to prevent any dangerous build-up or damage to the internal components. ...

February 23, 2026 · 6 min · Warat Fitschen