Takagi tankless water heater code 741
Remote controller communication failure. Code 741 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 741 means on each Takagi series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| Condensing | Remote controller communication failure | Part replacement | $150–$500 |
| Non-Condensing | Remote controller communication failure | Part replacement | $150–$500 |
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 741 — 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 741 agree and where they part company.
Condensing — Remote controller communication failure
The remote controller and the water heater are not communicating. It is a link fault rather than a failure of either end on its own.
Non-Condensing — Remote controller communication failure
The remote controller and the water heater are not communicating — a link fault rather than a failure of either end. Shown as 74 on a T-K4 or T-KJr2 remote; Takagi lists no red LED flash count for it, which makes sense, since without a remote there is nothing to fail.
Does it matter which Takagi you have?
Condensing and Non-Condensing all route code 741 the same way: a replacement part, at $150–$500. 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 741, so they are safe to work through before you have identified your exact unit. They also cost nothing.
- Note whether the remote display is blank, frozen, or showing nonsense.
- Note any recent work near the wiring between the remote and the unit.
- Book a service call.
That is 3 of the 3 checks documented for code 741. 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 741, 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. 13), 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 741
Code 741 on these 2 Takagi series points at 1 part, each named by the manufacturer's own procedure for this code.