Noritz tankless water heater code Er29
Air pressure switch fault. Code Er29 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 Er29 means on each Noritz series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| NRCP | Air pressure switch fault | Call a pro | $0–$700 |
| NRCP Eco TOUGH | Air pressure switch fault | 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 Er29 — 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 Er29 agree and where they part company.
NRCP — Air pressure switch fault
The air pressure switch is not reporting what the unit expects. Noritz's remedies point at everything that can restrict the air and exhaust path: the exhaust pipe free of obstructions, a clean intake air filter, a condensate trap or pipe that is not clogged, and a condensate line that slopes downward.
NRCP Eco TOUGH — Air pressure switch fault
The air pressure switch is not reporting what the unit expects. Noritz's remedies are the exhaust pipe free of obstructions, a clean intake air filter, and making sure the condensate trap or drain pipe is not clogged. Manual reset.
Does it matter which Noritz you have?
NRCP and NRCP Eco TOUGH all route code Er29 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.
What to check first, whatever your series
These checks are on the manufacturer's list for every Noritz series that reports code Er29, so they are safe to work through before you have identified your exact unit. They also cost nothing.
- Check the exhaust terminal outside for snow, leaves, a nest or anything built against it.
- Clean the intake air filter.
- If all three are clear, call a licensed professional rather than taking vent sections apart.
That is 3 of the 4 checks documented for code Er29. 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 Er29, 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 Er29
Code Er29 on these 2 Noritz series points at 2 guides, 3 parts and 2 symptoms, each named by the manufacturer's own procedure for this code.