Noritz NRC Series Code 76
Display window communication fault. The circuit board and the display window inside the cabinet have lost contact. Noritz checks the connection between them and looks for damage to either. It is a communication fault between two parts of the appliance, not a fault in how it heats water.
Also displayed as: 768
Part replacementThe verdict
Replace a part
The heater's own diagnostics are what is broken here, which mostly matters the next time something else goes wrong. Cycle the power first — Noritz's remark says that is the reset — and book it in if it stays.
Typical cost: $0–$600
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 NRC Series — not averaged across the brand.
Source: Noritz Service Manual — NR501-OD, NR662-OD, NRC661, NRC711 (Rev. Dec 2013) (p. 28), read Sep 2026 — the manufacturer's own documentation for this exact series.
What you can safely check
- Cut the power for a minute and restore it.
- If 76 returns, book a service call; it is a connection or a damaged part, and both are inside the cabinet.
Code 76 on other Noritz series
Code 76 is a different fault on every other Noritz series that documents it, which is exactly why this page is written for the NRC Series alone:
Don't confuse this with
One other Noritz NRC Series code points at a link between two boards too. They are the same symptom reported from a different place in the unit, so which one the display shows is what tells you where to look: