Takagi tankless water heater code 111
Ignition failure. Code 111 means the same thing on all 2 Takagi series documented here — but the fix, and what it costs, is still worth reading for your exact unit.
What code 111 means on each Takagi series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| Condensing | Ignition failure | Call a pro | $150–$900 |
| Non-Condensing | Ignition failure | Call a pro | $150–$900 |
Each row opens the full page for that generation. We hold manuals for Condensing and Non-Condensing, and each one gets its own reading of code 111 — what Takagi documents, what you can safely check yourself, and what the repair should cost.
What each manual actually says
The table above compares 2 series in four columns, which is enough to route you and not enough to explain anything. This is the Takagi wording behind each row, one entry per manual, so you can see where the 2 readings of code 111 agree and where they part company.
Condensing — Ignition failure
The heater does not fire after three failed attempts at ignition. Takagi's step one is not the igniter but the hi-limit switch: turn the power off, push the white button in until it clicks, then power back on. Its list continues through gas supply and pressure, a plastic tube between the proportional gas valve and the combustion chamber, the overheat cutoff fuse, a dirty flame sensor, the igniter spark, and vent blockages.
Non-Condensing — 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).
Does it matter which Takagi you have?
Condensing and Non-Condensing all route code 111 the same way: a professional, at $150–$900. That makes it one of the Takagi numbers you can act on before working out which unit you own.
What to check first, whatever your series
These checks are on the manufacturer's list for every Takagi series that reports code 111, so they are safe to work through before you have identified your exact unit. They also cost nothing.
- If you smell gas, leave the building and call your gas utility from outside.
- Check that other gas appliances in the house work.
- Book a licensed professional.
That is 3 of the 5 checks documented for code 111. The rest differ by generation, so if none of those explains it, go to your own series above.
Which Takagi do you have?
On the 2 series that report code 111, the model number on the rating label starts T — match yours against the 3 listed below. You can also use the full model-number decoder.
Where this comes from
Source: Takagi Condensing Models On-Demand Water Heater Troubleshooting Guide (p. 15), read Aug 2026 — the manufacturer's own documentation for this Takagi range.
Source: Takagi Non-Condensing Models On-Demand Water Heater Troubleshooting Guide (p. 12), read Aug 2026 — the manufacturer's own documentation for this Takagi range.
Parts, guides and symptoms behind code 111
Code 111 on these 2 Takagi series points at 3 parts and 2 symptoms, each named by the manufacturer's own procedure for this code.