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
Other Noritz series report code Er45 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 NRCP Eco TOUGH code points at a leak 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: