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Checking for Error Conditions
Chapter 5. – Troubleshooting
Error Code Error Code Description Possible Remedies
Er:11
Ignition has Failed 10 (Ten)
Times
Press the Power button to clear the Error Code. If error code still appears on
the display then check the following.
• Make sure that the gas valve is in the fully open position.
If Error happens again:
Contact the installer or Noritz America Technical Support for assistance.
Er:29
Air Pressure Switch Abnormality
Press the Power button to clear the Error Code. If error code still appears on
the display then check the following.
• Make sure that the exhaust pipe is free of obstructions.
• Clean the intake air lter.
• Make sure that clogged of condensate trap or drain pipe.
If Error happens again:
Contact the installer or Noritz America Technical Support for assistance.
Er:40
Gas Leakage is Detected in 10
Minutes, or three times within
One Hour (Greater than 5 Sec-
onds Each Time)
IMPORTANT: If you smell gas, STOP! Follow the instructions on page 4, this
guide, and call a qualied service technician or the gas utility.
Press the Power button to clear the Error Code.
If Error happens again:
• Check the water heater cover. Ensure it is secure.
• Check gas connections for leakage with a soapy solution. Fix any leaks.
• Check condition of the burner assembly.
• If the problem persists, replace the circuit board.
Er:44
Recirculation Abnormality
•.Verify recirculation loop length is within specication.
• Check return line lter.
• Check the pump operation.
Er:45
Water leakage is detected in
water heater.
Press the Power button to clear the Error Code. If error code still appears on
the display then check the following.
• Check for the water in the bottom of the heater inside the case.
If you have conrmed the water leak, the water valve/gas valve closes and
contact the installer or Noritz America Technical Support for assistance.
When the water heater encounters an error, the display will ash “Er” followed by a numerical code. The water heater
shall enter a soft lockout condition if the error is such that it can return to normal operation once the condition relieves
itself (overheat conditions, temperature sensor open or shorts, etc.). The water heater shall enter a hard lockout if the
condition indicates the unit detected a condition preventing safe operation (Er.11_Ignition, Er.29_Condensate line,
Er.40_Gas leakage, Er.72_Flame) To clear a hard lockout Error Code, press the ‘Power Button’ off then on.
• Any other error code appears.
• An error code is indicated again after the above actions were followed.
• There are any other questions.
Contact Noritz America at 866-766-7489
4. Checking for Error Conditions
The following screen will display when the water heater encounters an error.
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