Noritz tankless water heater code Er11
Ignition failure. Code Er11 means the same thing on all 2 Noritz series documented here — but the fix, and what it costs, is still worth reading for your exact unit.
What code Er11 means on each Noritz series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| NRCP | Ignition failure | Call a pro | $0–$900 |
| NRCP Eco TOUGH | Ignition failure | Call a pro | $0–$900 |
Each row opens the full page for that generation. We hold manuals for NRCP and NRCP Eco TOUGH, and each one gets its own reading of code Er11 — what Noritz 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 Noritz wording behind each row, one entry per manual, so you can see where the 2 readings of code Er11 agree and where they part company.
NRCP — Ignition failure
The burner failed to light. Noritz documents the trigger precisely on this range: during a burning operation, if it fails to ignite ten times consecutively, Er11 appears. So by the time you see it the unit has already tried and given up repeatedly. The remedies are the main gas supply valve being open, the gas supply and inlet gas being within specification, and spark visible at the burner window.
NRCP Eco TOUGH — Ignition failure
The burner failed to light. As on the first generation, Noritz documents the trigger: during a burning operation, ten consecutive failed ignition attempts produce Er11. The remedies are the main gas supply valve being open and the gas supply and inlet gas being within specification. Noritz lists this as a manual reset — the unit will not clear it on its own.
Does it matter which Noritz you have?
NRCP and NRCP Eco TOUGH all route code Er11 the same way: a professional, at $0–$900. 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 Er11, so they are safe to work through before you have identified your exact unit. They also cost nothing.
- Check the main gas supply valve at the heater is fully open, and the meter valve too.
- Call a licensed professional rather than continuing to reset it.
That is 2 of the 4 checks documented for code Er11. 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 2 series that report code Er11, the model number on the rating label starts NRCP — match yours against the 4 listed below. You can also use the full model-number decoder.
Where this comes from
Source: Noritz Service Manual — NRCP111-DV / NRCP98-DV (Rev. 09/19) (p. 62), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
Source: Noritz Service Manual — NRCP1112-DV / NRCP982-DV Eco TOUGH (Rev. 05/19) (p. 58), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
Parts, guides and symptoms behind code Er11
Code Er11 on these 2 Noritz series points at 3 parts and 3 symptoms, each named by the manufacturer's own procedure for this code.