25
Troubleshooting-1
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.
Check for an Error Code on the Display Window or Optional Remote Controller
If there is a problem with the unit, a numerical error code will
ash on the display window or optional remote controller.
If this occurs, take appropriate measures as listed below.
When an error code appears, the display and the
operation light will ash together.
Flashing
Optional Remote Controller
Display Window Remote Controller
Cause Action
Error Code Error Code
Ignition error.
Check whether the gas valve is open. Unplug the unit from power
or press the power button on the optional remote controller 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.
Clogging of condensate trap
or drain pipe.
Check to see if the condensate drain pipe is
clogged or frozen. (
page
8)
Contact the installer or Noritz America
Technical Support for assistance.
Abnormal combustion.
[When supplying combustion
air from the indoors]
The air supply vent may be
clogged.
Clean the air supply vent. (
page
22)
If the display continues, contact the nearest
Noritz agent.
Abnormal combustion,
low gas supply pressure.
Have a professional check the gas supply pressure.
Contact the nearest Noritz agent.
Abnormal combustion. Contact the nearest Noritz agent.
The unit detects Scale Build-up
in the Heat Exchanger.
(Warning indication, and
then the unit will shut off
before long.)
When the error code is ashing in the Display Window, a warning indication will
appear in the Display Window. And then 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 the Scale
Build-up in the Heat
Exchanger many times
(The unit is locked.)
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 outlet temperature is
colder than set temperature.
Contact the nearest Noritz agent.
The indication on the display window shown is not an error of unit.
If you try to supply a low ow of water when the inlet water temperature
is high, hot water is not supplied sometimes (combustion is automatically
stopped and the temperature of outlet water does not become hot).
Display Window
=1-4, F
# =1-9,
A, b, C, d, E, F
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