Noritz NR50-OD - Troubleshooting Error Codes for NCC199, NRC111 Series; Error Codes and Checkpoints (With Remote Controller)

55
*In a quick connect multi-system, "F##"(except F76) indicates an error code from the secondary unit (unit without a remote).
This error code is not mentioned in the owchart.
Note 1)
The ON/OFF condition of the neutralizer water level electrode can be checked using the maintenance monitors. When maintenance monitor number
19 reads "000", the condition of the electrode is normal. When this monitor reads "111", the condition of the electrode is abnormal.
Note 2)
Note 1)
Note 1)
Note 1)
Note 1)
Flame rod circuit abnormality
(Detection of ame when no
ame is present)
Check for abnormal combustion.
Check ue for blockage or obstruction.
Check for abnormal combustion.
Check ue for blockage or obstruction.
Check for proper connection of quick connect cord.
Check connection from remote controller to circuit board.
Check remote controller and circuit board for damage.
Check for proper setting of maintenance writers on circuit board.
Check the circuit board (microcomputer) for damage. Check the
Dip switch. Check the "Control switch connector"
(ex.high elevation connector etc.).
Combustion abnormality
(Unit shuts o)
Multi-system communication
error
Remote controller transmission
abnormality
Circuit board setting abnormality
(High elevation connector,
Dip switch, etc)
Combustion abnormality
(Warning indication)
760
F76
(F) 90
(F) 73
Check that the main ow control valve is functioning ( ).
Check for improper connection of the valve.
Check for damage to the gas solenoid valve drive circuit on the
circuit board.
Measure the resistance through the inlet thermistor ( ).
Check for an open or short circuit.
Check for improper connection of inlet thermistor.
Measure the resistance through the outlet thermistor ( ).
Check for gas proportioning valve trouble ( ).
Check for abnormal combustion.
Check ue for blockage or obstruction.
Diagnosis Point (Trouble Point)
Flame rod does not detect ame
(Flame fault detection)
Outlet thermistor abnormality
Main ow control valve
abnormality
Circuit board abnormality
Heat exchanger thermistor
abnormality
Gas solenoid valve drive circuit
abnormality
(F) 72
(F) 71
(F) 70
(F) 66
Fan motor abnormality
(F) 61
(F) 65
(F) 33
Circuit board failure
Air inlet thermistor abnormality
High limit switch triggered
Abnormally high output
temperature
Overheat Prevention Device
(Thermal Fuse) triggered
Inlet thermistor abnormality
(F) 32
(F) 31
(F) 30
(F) 16
(F) 14
Ignition failure
(Initial ame fault detection)
Combustion abnormality
(BTU Drop)
(Unit Continues Working)
(F) 12
(F) 11
Display
Description
Measure the current from the ame rod when there is no ame
( ).
Check for a ground fault.
Check the gas supply piping and pressure. Check for igniter
spark ( ). Check gas solenoid valves ( ).
Check ame rod ( ). Check ground, paying special attention to
the ground connection to the circuit board.
Check for accidental extinction of the ame. Check for abnormal
combustion. Check gas solenoid valves. Check ame rod ( ).
Check ground, especially on circuit board.
Check for melting or damage to the thermal fuse ( ).
Check for improper connection of thermal fuse.
Check if high limit switch is triggered ( ).
Check for improper connection of high limit switch.
Check if exhaust gas temp. is too high.
Measure the resistance through the air inlet thermistor ( ).
Check for an open or short circuit.
Check for improper connection of air inlet thermistor.
Measure the resistance through the heat exchanger thermistor
( ). Check for an open or short circuit.
Check for improper connection of heat exchanger thermistor.
Check that the fan is rotating and check the pulse frequency from
the fan rotational frequency sensor ( ). Check for improper
connection of the fan. Check voltage from circuit board.
16
11
10
9
19
20
18
16
13
12
14
15
To reset this error code, the power needs to
be disconnected and then reconnected.
To reset this error code, the power needs to
be disconnected and then reconnected.
* This model has 2 kinds of high limit switch.
To reset this error code, the power needs to
be disconnected and then reconnected.
Remarks
Measure the resistance through the outlet thermistor ( ).
Check for an open or short circuit.
Check for improper connection of outlet thermistor.
(F) 59
Heat exchanger ow
abnormality
Check for scale build-up in heat exchanger.Check for abnormal
combustion. Check ue for blockage or obstruction. Check that
ame ignites all across the burner.
Bypass ow control valve
abnormality
Check that the bypass control valve is functioning ( ).
Check for improper connection of the valve.
To reset this error code, the power needs to
be disconnected and then reconnected.
To reset this error code, the power needs to
be disconnected and then reconnected.
To reset this error code, the power needs to
be disconnected and then reconnected.
To reset this error code, the power needs to
be disconnected and then reconnected.
Check for abnormal combustion. Check ue for blockage or
obstruction. Check that ame ignites all across the burner.
Combustion abnormality
(Unit shuts o)
15
5
6
7
2
3
8
6
1
(F) 99
When replacing the neutralizer, refer to the instructions included
with the replacement neutralizer.
Neutralizer Life Cycle Warning
(F) 92
Neutralizer Life Cycle has ended
(F) 93
(F) 20
Neutralizer
Water Level Electrode
abnormality
Check for Neutralizer blockage ( ).
Check for drain pipe blockage.
Check for proper connection of neutralizer water level electrode.
(F) 29
(F) 10
Note 2)
Error Codes and Checkpoints (In the case of optional remote controller connection)
<NCC199 (-SV,-DV) / N-0841MC (-DV), NRC111 (-SV,-DV) / N-0842MC (-DV)>