If you're looking for help fixing your Noritz Water Heater, look no further! Our comprehensive Noritz Water Heater error code guide will explain common issues, provide tips, and show you how to read your model's error codes.

CODE: 05 
PROBLEM: Service warning. 
FIX: This is not an error code but is the automatic service reminder that informs you that it is time to call a licensed technician. Do not reset the water heater error code before the service; otherwise, the unit might fail prematurely. 

CODE: 10 
PROBLEM: The error code 10 shows the problem in gas combustion that causes the power level to drop, while the burning continues even after shutdown. 
FIX: Check for foreign materials found on the burner which is burning after gas combustion stops. To reset the error code 10, the power must be disconnected. If there is a recirculation loop use an aquastat to keep 10 degrees differential. 

CODE: 11 
PROBLEM: The ignition fails. 
FIX: Make sure that the gas pressure has a correct value and per manufacturers specs., that there are no obstructions in venting and flame rod is clean, together with the ignition plug. 

CODE: 12 
PROBLEM: Burner flame loss during operation; flame rod does not detect a flame. 
FIX: Check for the incoming gas pressure. Remove any obstructions in the venting system. Clean the ignition plug and flame rod. 

CODE: 14 
PROBLEM: Thermal fuse failure. 
FIX: Replace the thermal fuse if you see the error code 14. Make sure that the water heater has no restriction in air flow and the gas burns properly. Also, check the water quality as the poor quality may affect the heat exchanger function, and lead to the element replacement, unless flushed on time. 

CODE: 16 
PROBLEM: Extremely high water temperature. 
FIX: Your Noritz water heater might need descaling due to the sediment and limescale build up. Manifold pressure might require an adjustment. 

CODE: 20 
PROBLEM: Activation of the high limit switch. 
FIX: Check is the high limit switch working as it should. Remove the limescale that causes the high temperature of hot water. 

CODE: 29 
PROBLEM: High water level in the neutralizer and clogging. 
FIX: Make sure the draining is proper, so there is no clogging of the condensate drain pipe. Water level sensor on the neutralizer must be free of moisture so the pipe will not freeze. 

CODE: 31 
PROBLEM: Problem with the inlet thermistor. 
FIX: Replace the inlet thermistor. 

CODE: 32 
PROBLEM: Problem with the outlet thermistor. 
FIX: Replace the outlet thermistor. 

CODE: 33 
PROBLEM: Heat exchanger thermistor malfunction. 
FIX: Replace the thermistor. 

CODE: 59 
PROBLEM: Low input BTU, problems with the combustion. 
FIX: The gas combustion chamber does not get enough fresh air, or the products of combustion are not vented fully because of the blockage in vents. Remove any blockage in venting. Clean the fan motor and burner chamber. Also, the water heater should be adjusted for the right height elevation. 

CODE: 61 
PROBLEM: Faulty fan motor. 
FIX: Measure the incoming voltage. Check and replace if needed the fan motor or circuit board. 

CODE: 66 
PROBLEM: Problem with the bypass flow control valve. 
FIX: If there is a blockage of bypass servo, correct it. If the element is not operating properly, replace it. 

CODE: 70 
PROBLEM: Faulty circuit board. 
FIX: Replace the circuit board. 

CODE: 71 
PROBLEM: Gas valve drive circuit abnormality. 
FIX: The error code 71 happens if the water heater is connected to the battery backup, solar power or generator and if there is a fluctuation in voltage supply. Check the voltage from the circuit board due to the damage. 

CODE: 72 
PROBLEM: The flame rod detects the flame without the ignition sequence. 
FIX: The unit must have a proper grounding. Check if there is damage on the circuit board and flame detection circuit. 

CODE: 73 
PROBLEM: The problem with the circuit board setting. 
FIX: Reset the heater by disconnecting the power and check the circuit board programming. 

CODE: F76 
PROBLEM: The communication error for the multi-system. 
FIX: Disconnect the power to reset the unit and make sure that the connecting cord is not damaged. 

CODE: 760 
PROBLEM: Problems with the remote controller. 
FIX: Reset the unit, check the wire connections and make sure that only one controller is connected. 

CODE: 90 and 99 
PROBLEM: Gas combustion problem. 
FIX: Make sure the flame color is light blue (yellow tips are allowed). Remove any blockage in flue vent. 

CODE: 92 and 93 
PROBLEM: Neutralizer life cycle alert. 
FIX: Neutralizer must be replaced if its lifecycle is about to end; also you must reset the burner timer.

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