Takagi tankless water heater code 441
Your series decides which reading applies. Across the 2 Takagi series documented here, code 441 is listed as flow sensor fault (1 series) and flow sensor fault (easy-link systems) (1 series). Find your series in the table below, where those readings route to a replacement part.
What code 441 means on each Takagi series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| Condensing | Flow sensor fault | Part replacement | $150–$500 |
| Non-Condensing | Flow sensor fault (Easy-Link systems) | 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 441 — 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 441 agree and where they part company.
Condensing — Flow sensor fault
The flow sensor is not reporting correctly. It is what tells the heater water is moving, and a tankless unit will not fire without it — so this often presents simply as no hot water.
Non-Condensing — Flow sensor fault (Easy-Link systems)
The flow sensor is not reporting correctly. On this range Takagi marks the code as Easy-Link system only — it belongs to multi-unit installations rather than a single heater.
Does it matter which Takagi you have?
Condensing and Non-Condensing all route code 441 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 441, so they are safe to work through before you have identified your exact unit. They also cost nothing.
- Book a service call.
That is 1 of the 2 checks documented for code 441. 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 441, 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 441
Code 441 on these 2 Takagi series points at 1 guide, 2 parts and 1 symptom, each named by the manufacturer's own procedure for this code.