Noritz tankless water heater code 71
Your series decides which reading applies. Across the 5 Noritz series documented here, code 71 is listed as gas solenoid valve drive circuit fault (4 series) and gas valve drive circuit fault (1 series). Find your series in the table below, where those readings route to a professional.
What code 71 means on each Noritz series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| EZ Series & NCC199CDV | Gas valve drive circuit fault | Call a pro | $300–$1,200 |
| NCC199 & NRC111 | Gas solenoid valve drive circuit fault | Call a pro | $300–$1,000 |
| NR50, NR66 & NR71 | Gas solenoid valve drive circuit fault | Call a pro | $300–$1,000 |
| NR98 & NR111 | Gas solenoid valve drive circuit fault | Call a pro | $300–$1,000 |
| NRC Series | Gas solenoid valve drive circuit fault | Call a pro | $400–$1,000 |
Each row opens the full page for that generation. We hold manuals for EZ Series & NCC199CDV, NCC199 & NRC111, NR50, NR66 & NR71, NR98 & NR111 and NRC Series, and each one gets its own reading of code 71 — what Noritz documents, what you can safely check yourself, and what the repair should cost.
What each manual actually says
The table above compares 5 series in four columns, which is enough to route you and not enough to explain anything. This is the Noritz wording behind each row, one entry per manual, so you can see where the 5 readings of code 71 agree and where they part company.
EZ Series & NCC199CDV — Gas valve drive circuit fault
The circuit driving the gas valve has faulted. Noritz checks for damage to the gas valve drive circuit on the circuit board, and then measures the resistance through both high limit switches — the primary heat exchanger one and the burner chamber one. If the display persists after a power cycle, Noritz says to contact the nearest agent.
NCC199 & NRC111 — Gas solenoid valve drive circuit fault
The circuit that drives the gas solenoid valves has faulted. Noritz's check is damage to the gas solenoid valve drive circuit on the circuit board — the board's own report that it cannot drive the valves that admit gas to the burner.
NR50, NR66 & NR71 — Gas solenoid valve drive circuit fault
The circuit driving the gas solenoid valves has faulted. Noritz's check is damage to the gas solenoid valve drive circuit on the circuit board. Five flashes on an NR71 or N-0631S with no remote controller.
NR98 & NR111 — Gas solenoid valve drive circuit fault
The circuit driving the gas solenoid valves has faulted. Noritz's check is damage to the gas solenoid valve drive circuit on the circuit board — the board's own report that it cannot drive the valves that admit gas to the burner. The solenoid valve drive circuit is the same on every model in this range. What differs is what a failure costs to reach: on the ASME commercial units in this list the cabinet and the service access are not the residential ones.
NRC Series — Gas solenoid valve drive circuit fault
The circuit that drives the gas solenoid valves has faulted. Noritz attributes this one squarely to the circuit board rather than to the valves, and the display window appends a digit from 1 to 9. It is the board's own report that it cannot drive the valves that let gas into the burner.
How much the answer changes between series
EZ Series & NCC199CDV, NCC199 & NRC111, NR50, NR66 & NR71, NR98 & NR111 and NRC Series all route code 71 the same way: a professional, at $300–$1,200. That makes it one of the Noritz numbers you can act on before working out which unit you own.
The spread is real money. On the NCC199 & NRC111 the worst case is $1,000; on the EZ Series & NCC199CDV the same number can reach $1,200. That is a $200 gap behind one number.
Which Noritz do you have?
On the 5 series that report code 71, the model number on the rating label starts EZ, NCC, GQ, N and NRC — match yours against the 43 listed below. You can also use the full model-number decoder.
Where this comes from
Source: Noritz Service Manual — NRC663 FSV, EZ98DV, EZ111DV, NCC199CDV (Rev. Oct 2017) (p. 32), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
Source: Noritz Service Manual — NR50 / NR66 / NR71 / NR98 / NCC199 / NRC111 / NR111 / NC380 (Rev. July 2011) (p. 55), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
Source: Noritz Service Manual — NR50 / NR66 / NR71 / NR98 / NCC199 / NRC111 / NR111 / NC380 (Rev. July 2011) (p. 54), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
Source: Noritz Service Manual — NR50 / NR66 / NR71 / NR98 / NCC199 / NRC111 / NR111 / NC380 (Rev. July 2011) (p. 56), read Sep 2026 — the manufacturer's own documentation for this Noritz range.
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 Noritz range.
The same number on other brands
Code 71 is not a standard across the industry — every manufacturer publishes its own table. If your unit is not a Noritz, this number means something else entirely:
Parts, guides and symptoms behind code 71
Code 71 on these 5 Noritz series points at 3 parts and 2 symptoms, each named by the manufacturer's own procedure for this code.