NORITZ AMERICA CORPORATION NH199-DV Manuel D'installation Et Mode D'emploi page 30

Error descriptions and possible cause / check points
Error Code Possible Cause
113 Ignition failure
123 Flame rod is triggered
163 Hot water temperature does not
stabilize
633 PRIORITY 1 pump abnormality,
water flow switch failure
643 PRIORITY 2 pump abnormality,
water flow switch failure
733 Circuit board setting abnormality,
high elevation connector
903 Abnormal combustion
The error codes in bold cannot be reset by turning the boiler OFF on the operation panel.
Disconnect, then reconnect electrical power to the boiler to reset the system.
Please contact Noritz America if any other error code appears.
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Check Point (Location of Failure)
Is the gas valve closed?
Does the igniter spark?
Are all wiring connections to the gas valves secure?
Is the lead from the flame rod securely connected?
Is the gas valve closed?
Are all wiring connections to the gas valves secure?
Is the lead from the flame rod securely connected?
The heating load might be too large.
Is the hot water temperature higher than 131°F (55°C) or more?
If the hot water temperature is lower than 131°F (55°C), adjust
the flow in the heating circuit and/or check the temperature
setting on the operation panel.
Is the pump running?
Is the fuse inside the boiler blown?
Is the wiring for the flow switch properly connected?
Is the pump running?
Is the fuse inside the boiler blown?
Is the wiring for the flow switch properly connected?
This error code is displayed when the high elevation connector is
disconnected or connected while the boiler has power.
Disconnect power to the boiler before making this adjustment.
Check if there is any obstruction of the intake/exhaust pipe.