HotWater Decoded

Rinnai’s LC code is a maintenance reminder, not a failure: it means scale has built up enough to need a flush. Here’s how to clear it.

Rinnai code 61 means the combustion fan isn’t running correctly. This is almost always a professional repair — here’s why.

Rinnai code 14 means the thermal fuse tripped from overheating. This is a safety lockout — don’t just reset it without finding the cause.

Rinnai code 79 means the unit’s leak sensor tripped. It’s often a false alarm from a misadjusted sensor screw — here’s the documented fix.

Rinnai code 10 points to a blocked air intake or exhaust vent. Here’s how to check both safely and when to stop and call a pro.

Rinnai code 12 means the burner lit, then lost the flame signal. Check gas pressure under load, the flame rod, and venting.

Rinnai code 11 means the burner never lit. Check gas, venting, and the flame rod in this order. 7 steps, plus when to call a pro.

Every Rinnai tankless error code explained: what it means, the most likely cause first, and whether it’s safe to fix yourself.