Navien NFC-250/175H User'S Information Manual Download

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Troubleshooting

Error Code

Reason

Self-diagnostic/Action

E615

Abnormal operation: input and memory

Manual RESET
Auto RESET
Alarm

E736

Abnormal operation: cascade communication

Alarm

E740

Abnormal operation: outdoor temperature sensor (appears only
when the outdoor reset curve is enabled).

Alarm

E761

Abnormal Operation: Pre-Heat Aquastat

Alarm

E762

Abnormal flue gas duct: Vent pipe not properly inserted

Auto RESET

E773

Using the wrong gas

Parameter RESET

E777

Abnormal operation: LWCO limit (external device)

Auto RESET

E782

Abnormal operation: panel communication

Alarm

E784

Abnormal operation: zone controller communication
(external device)

Alarm

E786

Improper front panel

Alarm

E788

Abnormal Gas Setting

Manual RESET
(Start-up Wizard )

If these remedies do not resolve the problem, contact Technical Support at 1-800-519-8794.

Summary of Contents for NFC-250/175H

Page 1: ...our gas supplier call the fire department Installationandservicemustbeperformedbyaqualifiedinstaller serviceagencyorthegas supplier Theinstallationmustconformwithlocalcodesor intheabsenceoflocalcodes theNational FuelGasCode ANSIZ223 1 NFPA54and orCSAB149 1 NaturalGasandPropaneInstallation Code NSF ANSI 372 Keep this manual near this boiler for future reference whenever maintenance or service is re...

Page 2: ...r On or Off 10 3 2 Adjusting the System Temperatures 10 3 3 Accessing Basic Menu Items 12 3 4 Resetting the Boiler 13 4 Maintaining the Boiler 14 4 1 Cleaning the Boiler 14 4 2 Draining the Boiler 14 4 3 Cleaning the Air Intake Filter 15 4 4 Protecting the Boiler from Freezing 17 4 5 Maintenance Schedules 18 5 Troubleshooting 23 5 1 Solving Basic Problems 23 5 2 Understanding Error Codes 24 ...

Page 3: ...nce does not have a pilot It is equipped with an ignition device which automatically lights the burner Do not try to light the burner by hand B BEFORE OPERATING smell all around the appliance area for gas Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor WHAT TO DO IFYOU SMELL GAS Ɣ Do not try to light any appliance Ɣ Do not touch any electric swi...

Page 4: ... boiler with the front cover opened Doing so may result in fire or carbon monoxide CO poisoning which may result inpropertydamage personalinjury ordeath Do not operate this boiler without proper venting Doing so may result in fire or carbon monoxide CO poisoning which may result inpropertydamage personalinjury ordeath Inspect the vent termination and air intake supply annually to ensure proper ope...

Page 5: ...o property damage personal injury or death and will void your warranty Ɣ Do not operate the boiler if you feel something is wrong with it Doing so may result in product damage or personal injury Ɣ Do not allow children to operate or access the boiler Doing so may result in product damage or personal injury Ɣ Do not turn on the boiler unless the water and gas supplies are fully opened Doing so may ...

Page 6: ...Water temperatures at or above 125 F 52 C can cause instant scalding severe burns or death Before you decide to change the temperature setting read the following charts carefully Water Temperature Time in which a young child can suffer a full thickness 3rd degree burn 160 F 70 C Less than 1 second 140 F 60 C 1 second 130 F 55 C 10 seconds 120 F 49 C 10 minutes 100 F 37 C very low scald risk ...

Page 7: ...ion Each boiler is specially grounded both internally and externally to protect against lightning strikes Ɣ Carbon Monoxide Protection The boiler is designed to maintain a safe air to gas ratio and combustion rate This function is continuously monitored by the boiler s combustion controls Ɣ Auto Fan Detection The rotation of the fan is automatically detected and controlled Fan failure will stop th...

Page 8: ...eeze mode Auto air purge Displayed when an auto air purge is being performed e Cascade Main mode Flashes when configuring a cascade system Turns on solid if the boiler is set as the Main unit in a cascade system f DHW Operation Displayed when the pre heating feature is activated Ɣ Always on Intelligent Weekly Aquastat Manual AHU connection Displayed when the AHU connection settings are enabled If ...

Page 9: ...d for the boiler s operation such as space heating and DHW supply temperatures Refer to the following table for detailed information a Back button Return to the previous menu or screen b Mode button Enter the boiler s main menu c Power button Turn on or off the boiler d Command dial Rotate to switch between menu items or to increase decrease values Press to make a selection or to confirm changes c...

Page 10: ...turn the boiler on or off press the Power button When the power is on the boiler automatically enters normal operation mode and the boiler s operating conditions are displayed on the screen Note The boiler status icons remain displayed when the boiler is turned off 3 2 Adjusting the System Temperatures 3 2 1 Adjusting the Space Heating Temperature To adjust the heating temperature 1 In normal oper...

Page 11: ...to return to normal operation mode or rotate the Command dial to adjust other operation conditions You can adjust the temperature while the highlighted section is flashing Once the flashing stops the current temperature setting is stored Note Ɣ The space heating temperature cannot be adjusted when the Outdoor Reset Control is used Ɣ In case of outdoor reset sensor malfunction the boiler will opera...

Page 12: ...ater Pressure Water pressure psi 17 Flame Value Flame detector AD value Ɣ Flame On 8bit AD values equal to or lower than 70 Ɣ Flame Off 8bit AD values equal to or higher than 175 18 Fan Target RPM Set fan speed RPM 19 Fan Current RPM Fan speed RPM 20 Fan Target APS Set APS voltage V 21 Fan Current APS APS voltage V 3 3 Accessing Basic Menu Items In the Main Menu screen you can view the boiler s op...

Page 13: ...Exhaust temperature F 25 Outdoor Reset Outdoor reset status Enable Disable 26 Outdoor Reset Curve Outdoor reset curve load type displayed when the outdoor reset option 25 Outdoor Reset is enabled 1 Finned Tube Baseboard 2 FAN Coil 3 Cast Iron Baseboard 4 Low Mass Radiant 5 High Mass Radiant 6 Radiator 7 Custom set by installer 27 Boost Interval Time Boost interval set time min 28 High Altitude Sea...

Page 14: ...ut it is not waterproof Keep it as dry as possible 4 2 Draining the Boiler You will need to drain the boiler under certain circumstances such as when the boiler is not used for an extended period of time in order to prevent freeze damage Refer to 2 2 Parts of the Boiler on page 7 for details about part locations To drain the boiler 1 Place a bucket under the boiler to collect the residual water in...

Page 15: ...ed or as part of the annual maintenance To clean the air intake filter 1 Press the Power button on the front panel to turn off the boiler 2 Disconnect the power supply to the boiler 3 Unfasten the 4 latches 2 at the top and 2 at the bottom to remove the front cover 5 Remove the drain cap on the manifold system to drain the boiler Drain Cap Drain Cap Note Ɣ Place a bucket under the boiler to gather...

Page 16: ... Place the filter assembly back into the boiler and secure it with the screw 9 Replace the front cover 10 Reconnect the power supply to the boiler 11 Press the Power button on the front panel to turn on the boiler 4 Remove the screw that secures the air intake filter the filter is located at the top left of the boiler 5 Pull the filter out of the boiler ...

Page 17: ...he boiler at the beginning of every heating season and or when there is a problem 4 4 Protecting the Boiler from Freezing CAUTION Damage due to freezing is not covered by the Navien limited warranty Ɣ Freezing damage is most likely to occur due to back drafting caused by negative pressure in the building This is not a manufacturing defect and therefore Navien will not warrant any damages due to fr...

Page 18: ...ult in severe personal injury death or substantial property damage Ɣ The boiler should be inspected annually only by a qualified service technician In addition the maintenance and care of the boiler must be performed to assure maximum boiler efficiency and reliability Failure to service and maintain the boiler and system could result in equipment failure Ɣ Electrical shock hazard Turn off power to...

Page 19: ...ents Addressing the Reported Problems Inspect any problems reported by the owner and correct before proceeding Inspecting the Installation Area 1 Verify that boiler area is free of any combustible materials gasoline and other flammable vapors and liquids 2 Verify that air intake area is free of any of the contaminants listed in Installation Operation Manual If any of these are present in the boile...

Page 20: ...oper place of disposal Otherwise severe personal injury may result If no water flows valve is inoperative Shut down the boiler until a new relief valve has been installed 2 After following the above warning directions if the relief valve weeps or will not seat properly replace the relief valve Ensure that the reason for relief valve weeping is the valve and not over pressurization of the system du...

Page 21: ...ted with water Ɣ 3 hoses Ɣ A water circulation pump Ɣ 2 flush valves if not installed Note Before flushing the heat exchanger additional flush valves A and B must be installed on the near boiler piping included with Navien Manifold System Inspecting the Ignition and Flame Detector Electrodes 1 Remove the ignition and flame detector electrodes from the boiler heat exchanger 2 Remove any deposits ac...

Page 22: ... and allow the solution to circulate through the boiler Refer to the manufacturer s literature for information about the circulation time 10 Rinse the cleaning solution from the boiler a Remove the free end of the drain tube from the bucket and place it in the condensate drain or laundry tub wherever the boiler drains b Close the B valve and open the D valve Do not open the D valve yet c Allow wat...

Page 23: ...m Temperatures on page 10 Check for cross piping between the cold and hot water lines The water from the hot water faucet is too hot Is the set temperature set too high Check the boiler s temperature setting See 3 2 Adjusting the System Temperatures on page 10 Space heating side malfunction Is the setting temperature too low Check the boiler s temperature setting See 3 2 Adjusting the System Tempe...

Page 24: ...fan motor Manual RESET E110 Abnormal air pressure Manual RESET E205 Abnormal operation heating supply thermistor Auto RESET E218 Abnormal operation heating return thermistor Auto RESET E278 Abnormal operation system supply thermistor Alarm E279 Abnormal operation system return thermistor Alarm E351 Abnormal Auto feeder valve make up water Manual RESET E352 High water pressure Auto RESET E353 Abnor...

Page 25: ...Operation Pre Heat Aquastat Alarm E762 Abnormal flue gas duct Vent pipe not properly inserted Auto RESET E773 Using the wrong gas Parameter RESET E777 Abnormal operation LWCO limit external device Auto RESET E782 Abnormal operation panel communication Alarm E784 Abnormal operation zone controller communication external device Alarm E786 Improper front panel Alarm E788 Abnormal Gas Setting Manual R...

Page 26: ...period replacement of the Product or components may be authorized by Navien only Navien does not authorize any person or company to assume for it any obligation or liability in connection with the replacement of the Product or its components If it is determined that repair or replacement of a part under warranty is not possible the Product will be replaced with a new Product having at least the sa...

Page 27: ...ng but not limited to installation in violation of applicable rules laws or building codes inadequate water quality condensate damage improper venting incorrect gas type water pressure absence of a drain pan improper conversion from Natural Gas source to Propane reinstallation at another location etc Ɣ Accident abuse or misuse including but not limited to installation for non recommended uses fail...

Page 28: ......

Page 29: ...ler When you contact Technical Support please have the following information at hand Model number Serial number Date purchased Installation location and type Error code if any appears on the front panel display User s Information Manual NFC H Condensing Combi Boilers T H E L E A D E R I N C O N D E N S I N G T E C H N O L O G Y Version 1 0 February 2021 Navien Inc 800 519 8794 www navieninc com 20...

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