Noritz error code Er70
It depends on your series. Code Er70 does not point at the same fault on every Noritz unit. Find your series in the table below before you buy a part or book anyone.
What code Er70 means on each Noritz series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| NRCP | Circuit board fault | Part replacement | $0–$900 |
| NRCP Eco TOUGH | Circuit board processor error | Part replacement | $0–$900 |
Each series links to the full page: what the manufacturer's manual says for that generation, what you can safely check yourself, and what the repair should cost.
How much the answer changes between series
Every Noritz series that documents code Er70 routes it the same way: a replacement part. That is unusual enough to be worth saying, because on this brand the same number often means different work on different generations. Here it does not — so you can act on this page without first establishing which unit you own.
The cost is documented the same way across all 2 series: $0–$900, depending on which of the manufacturer's causes turns out to be yours.
What to check first, whatever your series
These checks are on the manufacturer's list for every Noritz series that reports code Er70, so they are safe to work through before you have identified your exact unit. They also cost nothing.
- Switch off at the breaker, wait a full minute, switch back on.
If none of those explains it, go to your own series above — the remaining checks differ by generation, and that is the whole reason this page exists.
Which Noritz do you have?
The model number is on the rating label on the unit itself. Match it against the list below — or 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 Er70
Everything the 2 Noritz series point at for this code, in one list. A part named here is one the manufacturer's own procedure reaches for.