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ErrBase

How to Reset a Noritz Tankless Water Heater and Clear Error Codes

Quick Answer

To reset a Noritz tankless water heater, press the power button once to turn the unit off, wait 30 seconds, then press it again. This is the soft reset procedure that clears most error codes. For a hard reset, disconnect power at the unit's dedicated circuit breaker for 60 seconds, then restore power.

To reset a Noritz tankless water heater, press the power button once to turn the unit off, wait 30 seconds, then press it again. This is the soft reset procedure that clears most error codes. For a hard reset, disconnect power at the unit's dedicated circuit breaker for 60 seconds, then restore power. Note that Code 14 (thermal fuse blown) cannot be cleared by any reset procedure - the fuse must be physically replaced. A reset that works but has the same code return within a day means the root cause still exists and needs to be fixed.

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error code on display
HUB
no ignition
11
flame lost during use
12
general troubleshooting
TROUBLESHOOTING

How to Reset Your Noritz Waterheater

Soft and hard reset procedures for Noritz tankless water heaters. Covers all resettable error codes and explains which codes cannot be cleared by reset.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Temporary fault condition that has cleared40%
Recurring fault requiring root cause repair before reset is effective36%
Error code from a one-time event (gas interruption, power surge)24%

Symptoms You May Notice

  • Error code displayed on controller
  • Unit not producing hot water
  • Unit showing previous error after restart
  • All lights off after power event

Tools Required for Diagnosis

None required for reset procedure

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Note the error code currently displayed

Note the error code currently displayed. Write it down before performing a reset. If the same code returns after reset, you will know where to focus repair efforts.

2

Soft reset

3

Press the power button again to turn the unit on

4

Hard reset (if soft reset fails or unit is unresponsive)

5

After a successful reset

Frequently Asked Questions

Where is the reset button on a Noritz water heater?
Noritz tankless water heaters do not have a dedicated labeled reset button. The reset is performed by pressing the main power button on the controller (RC-7651M or similar remote) once to power off, waiting 30 seconds, then pressing it again. For a hard reset, use the circuit breaker in the electrical panel.
How many times can I reset a Noritz water heater?
There is no technical limit to how many times you can reset. However, resetting without fixing the root cause is only masking the problem. If the same error code returns more than twice in one day, stop resetting and address the underlying fault or call a technician.
Why does my Noritz keep showing the same code after I reset it?
A code that returns immediately after reset means the underlying condition is still present. For example, if Code 11 returns after reset, the flame rod may still be dirty or gas pressure is still too low. The reset cleared the fault display but did not change the physical condition causing it.
Can a power outage cause my Noritz to show an error code?
Yes. A power surge, brownout, or dirty power event can trip a fault code even without any physical problem with the unit. A hard reset (breaker off 60 seconds, then on) is the appropriate response after a power event. If no code returns after the hard reset, the outage was the cause.
Does resetting clear the Noritz error history in service mode?
No. A soft or hard reset clears the active fault display but does not erase the stored error history in service mode. The history is retained for technician diagnosis. To view stored codes, hold Temp Up and Temp Down for 3 seconds after reset.

Related Noritz Waterheater Error Codes

Code: HUBNoritz Tankless Water Heater Error Codes: Complete NR and NRCP Series GuideCode: 11Noritz Code 11: No Ignition Fix for NR and NRCP SeriesCode: 12Noritz Code 12: Flame Failure During OperationCode: TROUBLESHOOTINGNoritz Tankless Water Heater Troubleshooting: 8 Common Problems and Fixes

Models Known to Experience RESET Errors

This repair applies to most Noritz waterheaters with this error code. Common model numbers include:

NRCP199-DV, NRCP111-DV, NR98-DV, NR66-DV, NR711

Last verified for technical accuracy on March 14, 2026