Noritz NRCP Eco TOUGH Code Er70
Circuit board processor error. Noritz calls this a MICOM error on the PCB — the microcontroller on the circuit board reporting a fault in itself. The remedy is to try to reset first, and if the same error code returns, contact technical support. Auto reset.
Also displayed as: 70, E70
Part replacementThe verdict
Replace a part
One free attempt, then a phone call. Noritz marks this auto reset, so the code may clear itself — which makes a note of when it happens more useful than the code being on the display right now.
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 Eco TOUGH — not averaged across the brand.
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 exact series.
What you can safely check
- Switch off at the breaker, wait a full minute, switch back on.
- Write down when the code appears and how often, since it may clear itself between visits.
- If it returns, contact Noritz technical support or a licensed professional.
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 Eco TOUGH 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: