Noritz tankless water heater code Er12
Flame loss. Code Er12 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 Er12 means on each Noritz series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| NRCP | Flame loss | Call a pro | $100–$700 |
| NRCP Eco TOUGH | Flame loss | Call a pro | $0–$700 |
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 Er12 — 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 Er12 agree and where they part company.
NRCP — Flame loss
The burner lit and the flame was lost. Noritz's remedies here are unusual for a flame code and worth reading literally: clean the intake air filter, and check or change the burner window by removing the flame sensor — noting that spare windows are in the emergency kit bag supplied with the unit. The burner window is the sight glass the flame sensor looks through, and a fouled one produces flame loss.
NRCP Eco TOUGH — Flame loss
The burner lit and lost the flame. Noritz's remedies on this generation are to clean the intake air filter, and to make sure the main gas supply valve is fully open or have a professional check the gas supply pressure. That is a real change from the first generation, whose Er12 sends you to the burner window and the spare windows in the emergency kit — neither appears here. Manual reset.
Does it matter which Noritz you have?
NRCP and NRCP Eco TOUGH all route code Er12 the same way: a professional, at $0–$700. That makes it one of the Noritz numbers you can act on before working out which unit you own.
Which Noritz do you have?
On the 2 series that report code Er12, 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 Er12
Code Er12 on these 2 Noritz series points at 1 guide, 3 parts and 2 symptoms, each named by the manufacturer's own procedure for this code.