User Guide
25
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Check for an Error Code on the Operation Panel
If there is a problem with the unit, a numerical error code will ash on the operation panel.
If this occurs, take appropriate measures as listed below.
When an error code appears, the display and the operation light will ash
together.
Flashing
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.
Have a professional check the gas supply pressure.
Contact the nearest Noritz agent.
Abnormal combustion, low
gas supply pressure
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 xture,
and turn the unit back on. If the ashing number
doesn't return the problem is solved.
The unit may shut off and lock before long.
Needs to be ushed 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 ushed.
Contact Noritz America for more information about
ushing 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 ush the Heat Exchanger to
remove the Scale Build-up.
Before ushing 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