Takagi Condensing Code 711
Hi-limit switch or overheat cutoff fuse. A safety device has operated. Takagi's hi-limit switch has a physical white reset button and can be pushed back in; the overheat cutoff fuse (OHCF) is the one-shot device behind it. Takagi's own instruction on other codes is telling — if resetting the hi-limit makes the unit fire, the cause of the trip must still be determined, and their technical service contacted.
Call a proThe verdict
Call a licensed plumber
Something overheated. The reset button makes it tempting to treat this as a nuisance, and Takagi's own documentation says otherwise: find out why it tripped. Scale in the heat exchanger and restricted combustion air are the usual answers.
Typical cost: $150–$1,400
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 Condensing — not averaged across the brand.
Source: Takagi Condensing Models On-Demand Water Heater Troubleshooting Guide (p. 13), 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 and leave it off until it has been checked.
- Do not open the cabinet to press the reset button — that is written for a technician, and a device that trips once will trip again.
- Note when the unit was last flushed and whether your water is hard.
- Book a licensed professional.
Frequently asked questions
There is a reset button. Why not just press it?
Because the button restores the appliance, not the reason it stopped. Takagi says directly that if the unit fires after a hi-limit reset, the cause of the trip must be determined — and the button is inside the cabinet of a gas appliance.
What is the difference between the hi-limit switch and the overheat cutoff fuse?
The switch resets. The fuse does not — it is a one-shot device that has to be replaced once it has opened, which is why Takagi treats a compromised OHCF as a call to their technical service.
Don't confuse this with
One other Takagi Condensing code points at a switch too. They are different components in different places, and ordering a part against the wrong one is the most common way this fault gets expensive: