Noritz NC250-SV-ASME Guide De L'utilisateur page 26

Troubleshooting-3
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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
26
Check for an Error Code
Cause
Ignition error
Abnormal combustion,
low gas supply pressure
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.
Action
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.
Have a professional check the gas supply pressure.
Contact the nearest Noritz agent.
Contact the nearest Noritz agent.
Flashing
Remote Controller