Noritz tankless water heater code 14
Thermal fuse triggered. Code 14 means the same thing on all 4 Noritz series documented here — but the fix, and what it costs, is still worth reading for your exact unit.
What code 14 means on each Noritz series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| NCC199 & NRC111 | Thermal fuse triggered | Call a pro | $200–$1,200 |
| NR50, NR66 & NR71 | Thermal fuse triggered | Call a pro | $200–$1,200 |
| NR98 & NR111 | Thermal fuse triggered | Call a pro | $200–$1,200 |
| NRC Series | Thermal fuse triggered | Call a pro | $200–$1,200 |
Each row opens the full page for that generation. We hold manuals for NCC199 & NRC111, NR50, NR66 & NR71, NR98 & NR111 and NRC Series, and each one gets its own reading of code 14 — what Noritz documents, what you can safely check yourself, and what the repair should cost.
What each manual actually says
The table above compares 4 series in four columns, which is enough to route you and not enough to explain anything. This is the Noritz wording behind each row, one entry per manual, so you can see where the 4 readings of code 14 agree and where they part company.
NCC199 & NRC111 — Thermal fuse triggered
The overheat prevention device — a thermal fuse — has opened. Noritz checks the fuse for melting or damage and its connection. A thermal fuse is a one-shot part: it does not reset, and it opened because something made the appliance hot enough to need it.
NR50, NR66 & NR71 — Thermal fuse triggered
The thermal fuse has opened. Noritz checks the fuse for melting or damage and its connection. A thermal fuse is a one-shot part: it does not reset, and it opened because something made the appliance hot enough to need it. On an NR71 or N-0631S with no remote controller this is four flashes.
NR98 & NR111 — Thermal fuse triggered
The overheat prevention device — a thermal fuse — has opened. Noritz checks the fuse for melting or damage and its connection. A thermal fuse is a one-shot part: it does not reset, and it opened because something made the appliance hot enough to need it. The overheat routes on this table are shorter than on the sibling NCC199 range: code 20 here is a single high limit switch, not the two Noritz notes there, and there is no neutralizer drain to back up into the flue. That leaves scale — code 59 — as the cause worth ruling out first.
NRC Series — Thermal fuse triggered
The overheat prevention device — a thermal fuse — has opened and cut the unit off. Noritz's checks are the fuse itself, for melting or damage, and its connection. A thermal fuse is a one-shot part: it does not reset, and it opened because something made the appliance hot enough to need it.
Does it matter which Noritz you have?
NCC199 & NRC111, NR50, NR66 & NR71, NR98 & NR111 and NRC Series all route code 14 the same way: a professional, at $200–$1,200. That makes it one of the Noritz 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 Noritz series that reports code 14, so they are safe to work through before you have identified your exact unit. They also cost nothing.
- Check nothing has been stacked against the heater or its vent terminal.
- Leave the unit off and call a licensed professional. Do not fit a fuse and carry on.
That is 2 of the 3 checks documented for code 14. The rest differ by generation, so if none of those explains it, go to your own series above.
Which Noritz do you have?
On the 4 series that report code 14, the model number on the rating label starts NCC, N, NRC, NR and NC — match yours against the 37 listed below. You can also use the full model-number decoder.
Where this comes from
Source: Noritz Service Manual — NR50 / NR66 / NR71 / NR98 / NCC199 / NRC111 / NR111 / NC380 (Rev. July 2011) (p. 55), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
Source: Noritz Service Manual — NR50 / NR66 / NR71 / NR98 / NCC199 / NRC111 / NR111 / NC380 (Rev. July 2011) (p. 54), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
Source: Noritz Service Manual — NR50 / NR66 / NR71 / NR98 / NCC199 / NRC111 / NR111 / NC380 (Rev. July 2011) (p. 56), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
Source: Noritz Service Manual — NR501-OD, NR662-OD, NRC661, NRC711 (Rev. Dec 2013) (p. 28), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
The same number on other brands
Code 14 is not a standard across the industry — every manufacturer publishes its own table. If your unit is not a Noritz, this number means something else entirely:
Parts, guides and symptoms behind code 14
Code 14 on these 4 Noritz series points at 2 guides, 2 parts and 2 symptoms, each named by the manufacturer's own procedure for this code.