Noritz GQ-C2857WS US Owner's Manual page 28

Troubleshooting-3
Check for an Error Code on the Remote Controller
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If there is a problem with the unit, a numerical error code will flash on the remote controller.
If this occurs, take appropriate measures as listed below.
When an error code appears, the display and the operation light will
flash together.
Error Code
=1-4, F
# =0-9
#
=0-9
28
Cause
Ignition error
Clogging of condensate
trap or drain pipe
[When supplying combustion
air from the indoors]
The air supply vent may be
clogged.
Abnormal combustion,
low gas supply pressure
Abnormal combustion
The unit detects Scale Build-up
in the Heat Exchanger.
(Warning indication, and
then the unit will shut off
before long.)
The unit detects the Scale
Build-up in the Heat
Exchanger many times
(The unit is locked.)
• Any other error code appears.
• An error code is indicated again after the above actions were followed.
• There are any other questions.
Check whether the gas valve is open. Press the power
button to turn the unit off, open a hot water fixture,
and turn the unit back on. If the flashing number
doesn't return the problem is solved.
Check to see if the condensate drain pipe is clogged
or frozen (
Contact the installer or Noritz America Technical
Support for assistance.
Clean the air supply vent.(
If the display continues, contact the nearest Noritz
agent.
Have a professional check the gas supply pressure.
Contact the nearest Noritz agent.
Contact the nearest Noritz agent.
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 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)
Contact Noritz America if:
Remote Controller
Action
p.8)
p.21)
Flashing