Rheem Tankless Gas Code 61
Blower motor speed fault. The blower motor speed was not appropriate to allow proper combustion. The fan sets how much air reaches the burner, so a fan that will not hold the speed the board asked for makes correct combustion impossible.
Call a proThe verdict
Call a licensed plumber
A real part at a real price, in the combustion air path. Debris in the blower housing is worth ruling out before the motor is replaced, but that means the unit open with power and gas off.
Typical cost: $250–$900
US estimate for parts and labor. Prices vary by region and by who does the work — see how we estimate costs.
What the manual says
The meaning above is transcribed from the manufacturer's diagnostic documentation for the Tankless Gas — not averaged across the brand.
Source: Rheem Tankless Gas Troubleshooting Pocket Manual (SVC820) (p. 73), read Aug 2026 — the manufacturer's own documentation for this exact series.
What you can safely check
Before anything else: if you smell gas, stop here, leave, and call your gas utility.
- Turn the unit off at the controller and at the breaker.
- Note any rattle or whine you heard before it failed — that points at the wheel or the bearings.
- Book a licensed professional.
Frequently asked questions
How is 61 different from 79?
Code 61 is about the speed the blower achieved. Code 79 is a blower motor current fault — the electrical draw rather than the resulting speed. They often end at the same part.