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Troubleshooting        21

MODE

If resetting the boiler and attempting the remedies suggested below do not resolve the problem, contact an authorized technician, a licensed 

professional, or Technical Support at 1-800-519-8794 for service instructions.

Problem

Possible Cause(s)

What to do

No water comes out when the hot water 

tap is opened.

 

Is the cold water inlet filter clean?

 

Is an error code displayed on the front 

panel?

 

Is the boiler frozen?

 

Ensure that the shut–off valves on the hot 

and cold pipes are open.

 

If an error code is displayed, refer to  

“5.2    Understanding Error Codes” on 

page 22.

The water from the hot water faucet is 

cold or turns cold and stays cold.

 

Is the hot water faucet open wide enough 

draw at least 0.5 gallons of water per minute 

(GPM) through the boiler?

 

Is an error code displayed on the front 

panel?

If an error code is displayed, refer to  

“5.2    Understanding Error Codes” on 

page 22.

The water from the hot water faucet is 

not hot enough.

Is the set temperature too low?

 

Check the boiler’s temperature setting. 

Refer to “3.2    Adjusting the Temperature” 

on page 9.

 

Check for cross plumbing 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 Temperature” on 

page 9.

Space heating side malfunction

Is the setting temperature too low?

Check the boiler’s temperature setting. 

See “3.2    Adjusting the Temperature” on 

page 9.

Is there power to the system, or is the system 

in stand by?

Make sure the power is on, and plugged 

into the outlet with the correct voltage. 

Press the Power button and raise the setting 

temperature. Make sure the boiler is turned 

on.

Is the system running for domestic hot water 

(DHW)?

When the unit is heating for DHW, the 

heating side does not work.

Is the filter on the heating side restricted?

Clean out filters that belong to the heating 

side.

5.    Troubleshooting

5.1    Solving Basic Problems

If you experience a problem with the boiler, refer to the following 

chart for possible remedies. Error codes that appear on the front 

panel display are explained in the following section.

For minor problems, resetting the boiler may resolve the issue. To 

reset the boiler, press the Reset button on the front panel.

Summary of Contents for NCB-180

Page 1: ...navienamerica com For warranty service always contact Technical Support first Contact the technician or professional who installed your boiler Contact a licensed professional for the affected system f...

Page 2: ...fire or explosion may result causing property damage personal injury or death Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance WHATTO D...

Page 3: ...9 3 3 Viewing Basic Information 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 Cleaning the Inlet Water Filter DHW side 13 4 4 Cle...

Page 4: ...tment C Use only your hand to push in or turn the gas control knob Neverusetools Iftheknobwillnotpushinorturnbyhand don t try to repair it call a qualified service technician Force or attempted repair...

Page 5: ...130 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...

Page 6: ...ler 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 to the appliance WARNING Shut off the gas suppl...

Page 7: ...side the boiler automatically detects the temperature and if necessary initiate a safety heating cycle to prevent internal equipment damage due to freezing temperatures Short Circuit Protection Any sh...

Page 8: ...important information required for the boiler s operation Refer to the following table for detailed information a Space heating mode f S Supply water control Indicates space heating mode operation In...

Page 9: ...t the values required for the boiler s operation such as space heating and DHW supply temperatures Refer to the following table for detailed information k Diagnostics button n Up button For installers...

Page 10: ...er settings menu The boiler will retain your settings during a power outage 3 1 Turning the Boiler On or Off To turn the boiler on or off press the Power button for 0 3 seconds MODE When the power is...

Page 11: ...he water temperature read To prevent burns on page 4 carefully Water above 120 F can cause instant scalding severe burns or death To adjust the water temperature 1 Make sure that all hot water faucets...

Page 12: ...to the Troubleshooting section of this manual or contact Technical Support at 1 800 519 8794 Display Description psi O R S R Outdoor reset curve Not in use 1 Finned tube baseboard 2 FAN coil 3 Cast ir...

Page 13: ...Boiler You will need to drain either both the space heating side and domestic hot water DHW side or one side only before performing maintenance tasks such as cleaning the inlet water filter or to pre...

Page 14: ...require draining and open a purge valve to drain the space heating side Open all domestic hot water faucets completely to drain the water heating side The water that remains in the plumbing lines will...

Page 15: ...rinse it with clean running water cold 4 Reinsert and tighten the strainer 5 Fill the boiler and check for proper operation 4 5 Cleaning the Air Intake Filter If the air intake filter becomes clogged...

Page 16: ...rew 10 Replace the front cover 11 Reconnect the power supply to the boiler 12 Press the Power button on the front panel to turn on the boiler 4 Remove the screw that secures the air intake filter the...

Page 17: ...t there is sufficient make up air to avoid such a situation and the owner is responsible for ensuring that protection against freezing is maintained To avoid freezing issues we strongly recommend the...

Page 18: ...e 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 p...

Page 19: ...glycol test for proper concentration as recommended by manufacturer Excessive pressure rise indicates expansion tank sizing or performance problem 4 Inspect automatic air vents and air separators Remo...

Page 20: ...ignition flame detector electrode making sure gasket is in good condition and correctly positioned Checking the Ignition Ground Wiring 1 Check that the ground wire is in good condition and securely a...

Page 21: ...on the supply and return water lines 4 Connect one tube to the A valve and place the free end in the bucket 5 Connect one of the tubes to the circulation pump outlet and the return water line at the B...

Page 22: ...fer to 3 2 Adjusting the Temperature on page 9 Check for cross plumbing 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 th...

Page 23: ...r open or short circuit Contact Technical Support at 1 800 519 8794 E351 Abnormal Auto feeder valve make up water Contact Technical Support at 1 800 519 8794 E352 High water pressure Contact Technical...

Page 24: ...al and shall be subject to Navien s schedule of approved labor allowances Warranty Exclusions Navien s Limited Warranty shall be void in the event of an occurrence of any of the following Improper ins...

Page 25: ...nited States and Canada Removal or alteration of the rating plate OtherTerms This Limited Warranty is subject further to the terms and conditions set forth herein and as may be further specified in th...

Page 26: ...Memo...

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