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When a failure occurs, information relating to the error blinks on the display.
The error alarm may also continuously sound.
Checking for Error Conditions
The display may indicate the type
of failure that has occured depending
on the system configuration.
Error Code Display Screen
To Stop the Error Alarm
Press the
button (the indicator will turn off).
Contact the nearest Noritz agent.
Abnormal combustion
Contact Noritz America if:
• Any other error code appears.
• An error code is indicated again after the above actions were followed.
• There are any other questions.
Error Code
Cause
Action
Ignition error
Check whether the gas valve is open. Press the power button to turn
the unit off, open a hot water fixture/faucet, and turn the unit back on.
If the flashing number doesn't return the problem is solved.
Have a professional check the gas supply pressure.
Contact the nearest Noritz agent.
Abnormal combustion,
low gas supply pressure
The unit may shut off and lock before long.
Needs to be flushed the Heat Exchanger to remove the Scale Build-up.
If the unit will shut off and locked for this error, the unit can temporarily operate
by disconnecting electrical power until the Heat Exchanger can be flushed.
Contact Noritz America for more information about flushing the Heat
Exchanger. (866-766-7489)
The unit detects Scale Build-up
in the Heat Exchanger.
(Warning indication, and
then the unit will shut off
before long.)
The unit is locked because of repeated Scale Build-up error codes.
Must flush the Heat Exchanger to remove the Scale Build-up.
Before flushing the Heat Exchanger, contact Noritz America for more
information.(866-766-7489)
The unit detects the Scale
Build-up in the Heat
Exchanger many times
(The unit is locked.)
#
=0-9
=1-4, F
# =0-9
Troubleshooting-3
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90
99
C
C F
Summary of Contents for NC199-DVC
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