Takagi Non-Condensing Code 111
Ignition failure. The heater does not fire after repeated attempts at ignition — a lack of spark, or a lack of gas reaching the burner. Shown as 11 on a T-K4 or T-KJr2 remote, or three flashes of the red LED (a count it shares with flame loss).
Also displayed as: 11
Call a proThe verdict
Call a licensed plumber
Confirm gas is reaching the house — that part is yours. Everything else is inside the cabinet of a gas appliance. Expect a service call, more if the igniter or gas valve is replaced.
Typical cost: $150–$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.
- If you smell gas, leave the building and call your gas utility from outside.
- Check that other gas appliances in the house work.
- On propane, check the tank level — cold weather chilling the regulator can cause this.
- Do not open the front panel to inspect the igniter.
- Book a licensed professional.
Frequently asked questions
The red LED flashes three times. Is that 111 or 121?
It could be either — Takagi gives both ignition failure and flame loss three flashes. The flash count narrows it to a group; a remote controller gives you the exact code.
Code 111 on other Takagi series
Other Takagi series report code 111 under the same fault name, but each manual is transcribed separately and they do not read alike: