Noritz EZ Series & NCC199CDV Code 70
Circuit board fault. The circuit board has reported a fault in itself. Noritz's entire diagnosis column is two words — circuit board failure — and the remark is that power must be disconnected and reconnected to clear it.
Also displayed as: F70
Part replacementThe verdict
Replace a part
Cut the power for a minute and restore it, which is Noritz's own reset. A board that faults once on a supply glitch may not fault again. If it comes back, it is the most expensive single part in the appliance.
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 EZ Series & NCC199CDV — not averaged across the brand.
Source: Noritz Service Manual — NRC663 FSV, EZ98DV, EZ111DV, NCC199CDV (Rev. Oct 2017) (p. 32), 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 the code returns.
- If it comes back, book a service call — Noritz gives no other cause.
Code 70 on other Noritz series
Other Noritz series report code 70 under the same fault name, but each manual is transcribed separately and they do not read alike:
Don't confuse this with
One other Noritz EZ Series & NCC199CDV 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: