This article answers the questions, what should I do if I see an error code on the Noritz water heater and the remote control. How Noritz error codes can help fixing the water heating problem.
Most of the Noritz water heaters come with the advanced technology and intelligent electronics which is a great help in troubleshooting the heating problems.
LCD display found on the control panel or remote control provides a
visual contact if the failure occurs. The numerical error code will
appear and it will flash on the display. Problems such as no hot water,
not enough hot water, flame loss, water too hot or cold, temperature
fluctuation, are just some of the problems that will be identified
through the error codes.
Before tackling the problem, it will be assumed that the Noritz model was installed per codes and manufacturer instructions. Gas type is natural gas.
Below is the list of the most common error codes, where Noritz NRC111 was taken as an example and where some codes are applicable to other models.
Problem: Power drops or gas combustion continues even after the unit is turned off.
Action: If the water heating
system has the recirculation, try to keep
the temperature with the difference of 10 degrees. If the
combustion continues, check if there is any foreign body, such as
oil/grease on the burner. In order to reset the code, turn the unit off
Problem: The error code 11 relates to the ignition failure.
Action: The gas pressure should
be checked for the right values. Check
for any obstructions in the vents as the unit might not be removing the
products of combustion properly or fresh air supply is blocked. Remove
any debris from the ignition rod, if it is dirty, and check for loose
wiring in the ignition.
Problem: The flame was detected, but it becomes either very low or it got extinguished.
Action: Check that there is
enough air coming for the proper gas
combustion. Make sure that the flame rod / sensor is not covered with
the debris - clean or replace it if necessary.
Problem: The problem is with the thermal fuse. This is a safety element and must be replaced if broken.
Action: If there is an obstructed
air flow in the vent system, the
water heater will operate with the poor combustion. Also check for the
clogged heat exchanger due to the lime scale or other impurities from
the poor water quality. Eliminate the cause of the problem by cleaning
or replacing the heat exchanger.
Problem: The outgoing hot water temperature is too high.
Action: Check the gas pressure
and adjust it if it is needed. The heat
exchanger has to be cleaned from the limescale. Reset the error code by
unplugging the power and plugging it back in after approximately 20
Problem: The activation of the high limit switch due to the overheating.
Action: This problem is usually
resolved by descaling the heat
exchanger, but first check is the problem with the high limit switch,
which should be replaced if broken.
Problem: The neutralizer does not drain the condensate properly so the water level is exceeding the correct level.
Action: Make sure there is a proper draining of the neutralizer (clean it if it is blocked) or clean the water level sensor from the moist. Also check that the condensate piping is properly sized and with the right slope.
Problem: Problem with the inlet (cold water side) or outlet (hot water side) thermistor.
Action: Check the elements for
the proper work.
Problem: Another problem with the thermistor, but this time on the heat exchanger.
Action: Replace if broken.
Problem: Problem with the combustion due to the low gas BTU input.
Action: Check the gas pressure and do the necessary adjustments if needed. If the unit is installed above recommended elevation, make sure to do the proper adjustments. Make sure there is no blockage in the venting system or debris on the burner.
Action: Use the voltmeter to
check the voltage on the fan. If the
voltage is OK check the fan operation and circuit board.
Problem: Main flow control valve
Action: Check the main servo on
the valve for blockage, failure and
replace it if needed.
Problem: Bypass flow control valve
Action: The same as the above
solution except the main valve servo,
check the bypass servo.
Problem: Circuit board failure
Problem: Gas valve drive circuit
Action: Use the voltmeter to
check the voltage on the circuit board and
replace it if there is a failure. The error code 71 is often seen when
the battery backup or generator is used, so there is a different
Problem: Flame rod detection abnormality
Action: Check for the correct
grounding and flame detection circuit on
the circuit board.
Problem: Issues with the settings on the circuit board
Action: The circuit board needs
proper programming or dip switch was
changed when power was supplied to the water heater. The error code
can be reset it by disconnecting the power for 30 sec and plugging it
Problem: No communication in multi-system setup
Action: Check the quick connect
cord and reset the unit by
disconnecting the power.
Problem: Remote controller functionality
Action: Reset the unit. Check the wiring connection and that only one remote is used.
Problem: Problem with the gas combustion
Action: Check for the obstructed
venting, improper gas burning (flame
shape and color change). Make sure the water heater gets the
recommended gas pressure and proper mixture of fuel and air (per
specs). After fixing the problem, reset the error code by disconnecting
Problem: Neutralizer life cycle is at the end of its life cycle
Action: Replace the neutralizer and reset the burner timer.
If any of the Noritz error codes appears on the screen, or unit doesn't show any but has problems, it is recommended to contact the technical service from Noritz or licensed technician. The above list of the error codes and presented solution of the problems is just for the reference.
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Pictures - courtesy of Noritz company