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 the great help in troubleshooting the heating problems.
The 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 attempting to solve the problem, it will be assumed that the Noritz model was installed per codes and manufacturer instructions. A gas type is a 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 and on.
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 gets 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 seconds.
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 if the problem is 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.
Problem: Fan failure
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 solution as for the above error code, except checking 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 voltage supply.
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 the power was supplied to the water
heater. The error code can be reset it by disconnecting the power for
30 secs and plugging it back in.
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 the unit.
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 appear 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.
Pictures - courtesy of Noritz company