Noritz NRCP Code Er76
Control panel communication error. The circuit board and the control panel have lost communication. Noritz's remedies are to check the connections from the circuit board to the control panel and to try the main power switch off and on.
Also displayed as: 76, E76
Part replacementThe verdict
Replace a part
The heater's ability to make hot water is not what has failed; its ability to be told what to do has. Start with a power cycle, which costs nothing and is one of Noritz's two remedies.
Typical cost: $0–$500
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
- Cut the power for a minute and restore it.
- If it stays, book a service call — the remaining item is the connection between the board and the panel.
Code Er76 on other Noritz series
Code Er76 is a different fault on every other Noritz series that documents it, which is exactly why this page is written for the NRCP alone:
Don't confuse this with
One other Noritz NRCP 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: