Noritz NRCP Code Er70
Circuit board fault. The circuit board has reported a fault in itself. Noritz's remedy is to try the main power switch off and on, and states the conclusion if that fails: still the same error means circuit board failure.
Also displayed as: 70, E70
Part replacementThe verdict
Replace a part
One free attempt, then the most expensive part in the appliance. Do the power cycle properly — off at the breaker, a full minute — before accepting Noritz's conclusion.
Typical cost: $0–$900
US estimate for parts and labor. Prices vary by region and by who does the work — see how we estimate costs.
What the manual says
The meaning above is transcribed from the manufacturer's diagnostic documentation for the NRCP — not averaged across the brand.
Source: Noritz Service Manual — NRCP111-DV / NRCP98-DV (Rev. 09/19) (p. 62), read Sep 2026 — the manufacturer's own documentation for this exact series.
What you can safely check
- Switch off at the breaker, wait a full minute, switch back on.
- Run a hot tap and see whether Er70 returns.
- If it returns, book a service call.
Code Er70 on other Noritz series
The same code number can mean something different on another series — make sure you're reading the page for your exact unit:
Don't confuse this with
One other Noritz NRCP code points at the circuit board too. They are different components in different places, and ordering a part against the wrong one is the most common way this fault gets expensive: