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16        Maintaining the Boiler

Cleaning the Condensate Trap

1.  Inspect the condensate drain line, condensate fittings, and 

condensate trap.

2.  Remove any sediment in the trap.

3.  Fill with fresh water until the water begins to pour out of the 

drain.

Checking all Piping for Leaks

Eliminate all system or boiler leaks. Continual fresh makeup water 

will reduce boiler life. Minerals can build up in sections, reducing 

heat transfer, overheating heat exchanger, and causing heat 

exchanger failure. Leaking water may also cause severe property 

damage.

1.  Inspect all water and gas piping and verify to be leak free.

2.  Look for signs of leaking lines and correct any problems found.

Checking the Flue Vent System and Air Piping

1.  Visually inspect the entire flue gas venting system and air 

piping for blockage, deterioration or leakage. Repair any 

joints that show signs of leakage. Verify that air inlet pipe is 

connected and properly sealed (if installed).

2.  Verify that boiler vent discharge and air intake are clean and 

free of obstructions.

WARNING

Failure to inspect for the above conditions and have them 

repaired can result in severe personal injury or death.

WARNING

 

Follow the service and maintenance procedures given 

throughout this manual and in component literature 

shipped with the boiler. Failure to perform the service and 

maintenance could result in damage to the boiler or system. 

 

Failure to follow the directions in this manual and 

component literature could result in severe personal injury, 

death, or substantial property damage.

 

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.

 

Electrical shock hazard – Turn off power to the boiler 

before any service operation on the boiler except as noted 

otherwise in this instruction manual. Failure to turn off 

electrical power could result in electrical shock, causing 

severe personal injury or death.

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 boiler intake air vicinity, they must be removed. 

If they cannot be removed, reinstall the air and vent lines per 

the Installation and Operation Manual.

Inspecting the Boiler Interior

1.  Remove the front cover and inspect the interior of the boiler.

2.  Vacuum any sediment from inside the boiler and components. 

Remove any obstructions.

Summary of Contents for NFC Series

Page 1: ...ontact a licensed professional for the affected system for example a plumber or electrician When you contact Technical Support please have the following information at hand Model number Serial number...

Page 2: ...ilding Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service must be...

Page 3: ...iler On or Off 9 3 2 Adjusting the Temperature 9 3 3 Accessing Basic Menu Items 10 3 4 Resetting the Boiler 11 4 Maintaining the Boiler 12 4 1 Cleaning the Boiler 12 4 2 Draining the Boiler 12 4 3 Cle...

Page 4: ...pplier call the fire department Do not return to your home until authorized by your gas supplier or the fire department C Do not use this appliance if any part has been under water Immediately call a...

Page 5: ...for use in the USA and Canada only Using the boiler in any other country will void the manufacturer s warranty Should overheating occur or the gas supply fail to shut off turn off the manual gas valve...

Page 6: ...0 F 55 C 10 seconds 120 F 49 C 10 minutes 100 F 37 C very low scald risk DANGER HOT BURN To prevent burns Use the lowest operating temperature setting necessary to provide comfortably hot water If you...

Page 7: ...eze Protection A sensor inside the boiler automatically detects the temperature and if necessary initiates a safety heating cycle to prevent internal equipment damage due to freezing temperatures Shor...

Page 8: ...when the boiler is operating in anti freeze 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...

Page 9: ...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 En...

Page 10: ...ion the boiler will operate at this set temperature Take note of the original heating temperature in case you want to restore it to the default The default space heating supply water temperature range...

Page 11: ...configure the space heating and DHW temperatures and review error history Press the Menu button to enter the Main Menu screen To view information about the boiler press the Menu button and then select...

Page 12: ...or contact Technical Support at 1 800 519 8794 Item Description 1 Operation State Current Operation State 2 Heat Capacity Heat Capacity 3 SH Set Temp Space Heating Set Temperature F 4 DHW Set Temp DH...

Page 13: ...ture resistant but it is not waterproof Keep it as dry as possible 4 2 Draining the Boiler You will need to drain the boiler before performing maintenance tasks such as to prevent the boiler from free...

Page 14: ...e filter every 3 4 months 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 th...

Page 15: ...of the boiler 6 Remove the filter from the plastic assembly Dust and rinse it with clean running water 7 Allow the filter to dry completely 8 Place the filter assembly back into the boiler and secure...

Page 16: ...enwillnotwarrant any damages due to freezing The installer is responsible for ensuring that there is sufficient make up air to avoid such a situation and the owner is responsible for ensuring that pro...

Page 17: ...e service and maintenance could result in damage to the boiler or system Failure to follow the directions in this manual and component literature could result in severe personal injury death or substa...

Page 18: ...ts over time rendering the valve inoperative Such conditions are not detectable unless the valve and its components are physically removed and inspected This inspection must only be conducted by a plu...

Page 19: ...filter is clean Review with the Owner 1 Review the User s Information Manual with the owner 2 Emphasize the need to perform the maintenance schedule 3 Remind the owner of the need to call a licensed c...

Page 20: ...r for 5 minutes d Close the A valve and open the C valve 11 Disconnect all tubes and valves 12 Reconnect the power supply to the boiler 13 Press the Power button on the front panel to turn on the boil...

Page 21: ...er to 3 2 Adjusting the Temperature on page 9 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 b...

Page 22: ...Manual RESET E110 Abnormal air pressure Manual RESET E205 Heating supply thermistor open or short circuit Auto RESET E218 Heating return thermistor open or short circuit Auto RESET E278 Abnormal oper...

Page 23: ...ration outdoor temperature sensor appears only when the outdoor reset curve is enabled Alarm E761 Abnormal Operation Pre Heat Aquastat Alarm E777 LWCO service code 7700 external device Auto RESET E782...

Page 24: ...riod 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 repla...

Page 25: ...tion for non recommended uses failure to follow or comply with the User s Operational Manual etc Improper maintenance including but not limited to scale buildup vent blockage failure to maintain etc M...

Page 26: ...Memo...

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