Navien NFC Series User'S Information Manual Download Page 23

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22 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

E777

LWCO (service code: 7700) (external device)

Auto RESET

E782

Abnormal operation: main panel communication

Alarm

E784

Abnormal operation: zone controller communication

Alarm

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

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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