Takagi Non-Condensing Code 611
Fan motor fault. The combustion fan motor is not behaving as the board expects. That fan supplies combustion air and moves exhaust, so nothing burns correctly without it. Shown as 61 on a T-K4 or T-KJr2 remote, or four flashes of the red LED.
Also displayed as: 61
Call a proThe verdict
Call a licensed plumber
A real part at a real price, in the combustion air path. Debris in the 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 Non-Condensing — not averaged across the brand.
Source: Takagi Non-Condensing Models On-Demand Water Heater Troubleshooting Guide (p. 12), 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.
- Book a licensed professional.
Frequently asked questions
Is there a separate exhaust fan code like on the condensing models?
No. The condensing range has 621 for an exhaust fan motor on indoor models; this range has no such code, because it does not have that fan.
Code 611 on other Takagi series
The same code number can mean something different on another series — make sure you're reading the page for your exact unit: