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
The same code number can mean something different on another series — make sure you're reading the page for your exact unit: