Noritz Tankless Water Heater Error Code 06: Meaning & How to Fix It

By the ErrorCodePro Editorial Team · Last reviewed October 20, 2026

Noritz tankless water heater error code 06 means: Recirculation abnormality (NRCR models only). [1] Keep using it? Yes, but recirculation may not work. Start with the owner checks below, beginning with: check the filters.

Smell gas? Leave the building now. Do not touch light switches, phones or appliances inside. Call your gas utility or 911 from outside. CO alarm sounding or headache, dizziness or nausea? Get everyone outside and call 911. Gas valves, burners, venting and wiring are for a licensed technician only. See our safety policy.

Quick facts

Code	06
Also shown as	061, 062
Brand / appliance	Noritz tankless water heater (nrcr condensing tankless water heaters (owner's guide))
System	Water fill
Official meaning	Recirculation abnormality (NRCR models only). [1]
Keep using it?	Yes, but recirculation may not work
DIY-safe?	Owner checks only (listed below)
Support	Noritz America Technical Support, 1-866-766-7489

On this page: Meaning · Steps · Parts · When to call a technician · Related codes · FAQ

What error code 06 means on a Noritz tankless water heater

Recirculation abnormality (NRCR models only). [1]

This is a water fill code. Codes and wording can vary by model, so check your owner's manual for your model number.

How to fix Noritz tankless water heater error code 06 (safe owner checks)

Owner checks only: on heating, cooling and water-heating equipment, limit yourself to reading the code and checking the thermostat, breaker and service switch, air filter, condensate drain, that the gas supply valve is open (no disassembly) and that vent terminals are clear of snow or debris. Reset power only if your manual allows it.

Safety first: disconnect power before you remove any panel or reach into the sump or drum. Do not touch wiring, the control board or the motor. If you see water near electrical parts, stop and call a technician. These steps are based on Noritz's published guidance [1], rewritten for clarity.

Check the filters. Check the return line filter and the crossover valve's filter.

Parts that may be involved

Exact parts depend on your model number. This page lists part types only, never part numbers.

No specific part is implied by the manufacturer's guidance for this code.

When to call a technician

Gas pressure, gas valve, igniter, flame rod, venting or combustion problems: licensed plumber or gas technician
Gas valves, burners, igniters, flame sensors, venting/flue or CO concerns: licensed HVAC technician or plumber
Refrigerant work: EPA 608-certified technician only
Smell of gas: leave and call the gas utility or 911
Anything involving wiring, the control board, the motor or the water valve electrics
The appliance is under warranty: contact Noritz America Technical Support, 1-866-766-7489 first

Frequently asked questions

What does error code 06 mean on a Noritz tankless water heater?

Noritz lists 06 as follows: Recirculation abnormality (NRCR models only).

Is it safe to keep using the tankless water heater with 06?

Yes, but recirculation may not work.

Can I fix Noritz tankless water heater error 06 myself?

Only with the owner checks on this page, starting with: check the filters. If it persists, call a technician or Noritz America Technical Support, 1-866-766-7489.

Is 061 the same as 06?

Yes. Noritz's documentation lists 061, 062 with the same meaning as 06; the display format depends on the model.

Sources

https://noritz.com/assets/nrcr_ownersguide.pdf (official)

Last reviewed: October 20, 2026. ErrorCodePro is not affiliated with Noritz.