Noritz NRCP Eco TOUGH Code Er72
Flame detected before ignition. The unit saw a flame signal before it should have. Noritz's remedies are to measure the current from the flame sensor when there is no flame, and notes that the power has to be disconnected and reconnected to clear the code. Auto reset in the reset column, with that manual instruction alongside it.
Also displayed as: 72, E72
Call a proThe verdict
Call a licensed plumber
A false flame signal is a safety fault, because the logic that decides whether it is safe to open the gas valve depends on it being honest. Noritz gives no homeowner check here — the one remedy is a current measurement.
Typical cost: $100–$700
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
Before anything else: if you smell gas, stop here, leave, and call your gas utility.
- Disconnect the power and reconnect it, which is the reset Noritz documents for this code.
- If Er72 returns, call a licensed professional — measuring flame sensor current is not a homeowner job.
Code Er72 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:
Don't confuse this with
2 other Noritz NRCP Eco TOUGH codes point at flame detection 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: