Tankless Specialists
Rinnai Service & Repair in Marietta, GA
Rinnai is one of the most widely installed tankless brands in Marietta, prized for compact sizing and endless hot water — but tankless units are more sensitive to scale buildup than a traditional tank, especially with Georgia's harder water. We handle Rinnai error codes and descaling with same-day service.
Know the Signs
Common Rinnai Issues We See
The remote controller is showing an error code. Rinnai units display numeric codes (like 11, 12, or 14) tied to specific faults — ignition, flow sensor, or venting issues each have their own code.
Water temperature fluctuates mid-shower. Often scale buildup on the heat exchanger restricting flow, especially if it's been over a year since the last descale.
The unit won't fire up at all. Can be an ignition fault, a gas supply issue, or a blocked intake/exhaust vent.
Reduced hot water flow at multiple fixtures. A classic sign of mineral scale narrowing the heat exchanger's internal passages.
Unusual noise during operation. Sometimes caused by scale buildup, sometimes by a failing fan motor — the specific sound tells us which.
How It Works
Our Process for Rinnai Repairs
We pull the exact Rinnai error code
The code narrows the cause to a specific system before we even open the unit.
Descale service if buildup is the cause
A flush with the correct solution clears mineral scale from the heat exchanger.
Full function test under real flow
Confirming consistent temperature at normal household water pressure before we leave.
Common Questions
Frequently Asked Questions
What does error code 11 mean on my Rinnai tankless unit?
Code 11 typically indicates an ignition failure. It can be caused by a gas supply issue, a dirty igniter, or a venting problem — we diagnose the specific cause on-site.
How often does a Rinnai tankless unit need descaling?
We recommend annual descaling for most Marietta homes, given the local water hardness, though homes with a water softener may be able to go longer between services.
Why does my Rinnai unit's water temperature fluctuate?
This is most often caused by scale buildup restricting flow through the heat exchanger, which an overdue descaling service typically resolves.
How long do Rinnai tankless water heaters last?
With regular descaling maintenance, Rinnai tankless units often last 15-20 years, longer than a typical tank water heater.
Have a Rinnai Unit That Needs Attention?
Tell us the model when you call, and we'll bring the right parts knowledge the first time. Same-day appointments, with 24-hour service for true emergencies.