Noritz NRCP Eco TOUGH Code Er45
Water leak detected. The unit has detected a water leak inside itself. Noritz's remedies are to close the water inlet valve before contacting technical support, and then to contact technical support. The order is deliberate — the valve first, the phone call second. Manual reset.
Also displayed as: 45, E45
Call a proThe verdict
Call a licensed plumber
Shut the water off at the heater and leave it off. Water inside a cabinet that carries mains voltage and gas controls is a hazard beyond the leak, and the damage compounds every hour it runs.
Typical cost: $200–$1,500
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 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
- Close the cold water inlet valve at the heater — Noritz puts this before the phone call.
- Switch the unit off at the breaker, not just at the controller.
- Do not open the cabinet to look for the source.
- Call a licensed professional or Noritz technical support.
Code Er45 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: