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24 Troubleshooting

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 domestic cold 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 25.

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 25.

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 See “3.2 Adjusting the Temperature” on

page 10.

●

Check for cross piping between the heating

supply and heating return 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 10.

Space heating side

malfunction

Is the setting temperature too low?

Check the boiler’s temperature setting. See “3.2

Adjusting the Temperature” on page 10.

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 Back button

(

) on the front panel.

Содержание NCB-190/060H

Страница 1: ...ur 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 performed by a qualified installer service agency or the gas supplier H NSF ANSI 372 Keep this manual near this boiler for future reference whenever maintenance or service is required The wetted surface of this product contac...

Страница 2: ...essing 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 Domestic Cold Filter DHW side 15 4 4 Cleaning the Heating Return Water Filter Space Heating side 16 4 5 Cleaning the Air Intake Filter 16 4 6 Protecting the Boiler from Freezing 18 4 7 Maintenance Schedules 18 5 Troubleshooting 24 5 1 Solving Bas...

Страница 3: ...ppliance 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 Do not try to light any appliance Do not touch any electric sw...

Страница 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...

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

Страница 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 ...

Страница 7: ... the gas supply Lightning Protection Each boiler is specially grounded both internally and externally to protect against lightning strikes 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 air ratio control module Auto Fan Detection The rotation of the fan is automatically detected and c...

Страница 8: ...eze 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 Always on Intelligent Weekly Aquastat Manual AHU connection Displayed when the AHU connection settings are enabled If the...

Страница 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...

Страница 10: ...wer 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 theTemperature 3 2 1 Adjusting the Space Heating Temperature To adjust the heating temperature 1 In normal operation mode rotate the Command dial The space heating temperature is h...

Страница 11: ...etain your settings during a power outage You can adjust the temperature while the highlighted section is flashing Once the flashing stops the current temperature setting is stored Note The space heating temperature cannot be adjusted when the Outdoor Reset Control is used In case of outdoor reset sensor malfunction the boiler will operate at this set temperature Take note of the original heating ...

Страница 12: ... psi 17 Flame Value Flame Detector AD Value Flame On 8 bit AD Values equal to or lower than 70 Flame Off 8 bit 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 operating conditions configure t...

Страница 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 20 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 Se...

Страница 14: ...sture 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 freezing when it will not be used for an extended period 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 r...

Страница 15: ...er is removed rinse it with clean running water cold and if necessary scrub it clean with a brush 3 Reinsert and tighten the filter 4 Fill the boiler and check for proper operation 5 Remove the drain cap on the manifold system to drain the boiler Drain Cap Drain Cap Note Place a bucket under the boiler to gather water released from the manifold system Do not allow the pump to become wet ...

Страница 16: ...oiler 3 Unfasten the 4 latches 2 at the top and 2 at the bottom to remove the front cover and gain access to the internal components 4 4 Cleaning the Heating Return Water Filter Space Heating side If the heating performance is decreased you can increase the heating performance by filtering impurities from the system To clean the filter 1 Drain the space heating side of the boiler Refer to 4 2 Drai...

Страница 17: ... 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 ...

Страница 18: ...mage 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 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 protection against freezing is maintained To avoid fr...

Страница 19: ...t be verified by a qualified service technician 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 Manu...

Страница 20: ...lure to follow these instructions can result in fire or explosion and personal injury or death 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 Cleaning the CondensateTrap 1 Inspect the condensate drain line condensate fittings and condensate trap 2 Remove any sediment ...

Страница 21: ...corrosive water conditions and to ensure that the valve and discharge line have not been altered or tampered with illegally WARNING Certain naturally occurring conditions may corrode the valve or its components 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 ...

Страница 22: ... circulation pump 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 A C B D Check the Burner Flame 1 Inspect flame through observation window 2 If the flame is unsatisfactory at either high fire or low fire check for obstructions in the venting and ensure that the ...

Страница 23: ...or 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 boiler To flush the Heat Exchanger A B C D Flushing Kit Circulation Pump Heating Return Heating Supply Navien Manifold System 1 Press the Power button on the front panel to turn off the boiler 2 Disconnect t...

Страница 24: ...e 3 2 Adjusting the Temperature on page 10 Check for cross piping between the heating supply and heating return 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 10 Space heating side malfunction Is the setting temperature too low Check the boiler s temperature setting See 3 2 Ad...

Страница 25: ...fan motor 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 Alarm 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 Abno...

Страница 26: ...ue gas duct Vent pipe not properly inserted Auto RESET E773 Using the wrong gas Contact technical support at 1 800 519 8794 E777 LWCO service code 7700 external device Auto RESET E782 Abnormal operation main panel communication Alarm E784 Abnormal operation zone controller communication Alarm E786 Improper front panel Contact technical support at 1 800 519 8794 E788 Abnormal Gas Setting Check the ...

Страница 27: ...ll be warranted only for the unexpired portion of the original component s applicable warranty period Payment for labor in completing the warranty service is subject to Navien s prior written approval 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 insta...

Страница 28: ...God Operating using or storing the boiler in a corrosive or contaminated atmosphere or environment Operating the boiler at water temperatures outside the factory calibrated temperature limits and or exceeding the maximum setting of the high limit control Operating the boiler when it is not supplied with potable water at all times Subjecting the heat exchanger to pressures or firing rates greater o...

Страница 29: ...Memo ...

Страница 30: ......

Страница 31: ... 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 Date purchased Installation location and type Error code if any appears on the front panel display User s Information Manual NCB 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 ...

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