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86 Troubleshooting

5.2.17 Error 421

Error conditions and Check Items

Error

Description

E421

Cold water inlet thermistor open or short

If an error (open: -10°C or lower) in the DHW Outlet Elbow input temperature sensor is

detected, the system displays the 421E error on the front panel.

Check items

1. Check if the cold water temperature sensor connector is wet due to any reason and if

the connector is connected properly.

2. Check if the temperature sensor is open or short.

Is the inlet thermistor

normal?

Check connector

Replace inlet thermistor

See page 38 for Wiring Diagram.

Yes

Before measuring resistance of the

thermistor, detach the connector

from the PCB.

Содержание NCB500-2S/37K

Страница 1: ...uk For warranty service always contact an official Technical Assistance Service TAS first Contact the technician or professional who installed your boiler Contact a Gas Safe Registered engineer When...

Страница 2: ...rol or other flammable vapours and liquids in the vicinity of this or any other appliance WHATTO DO IFYOU SMELL GAS Do not try to light any appliances Do not touch any electrical switch do not use any...

Страница 3: ......

Страница 4: ...Revisions 3 Version Description of changes Date 1 00 First issue September 7 2022 Revisions...

Страница 5: ...ion 56 5 2 Error Code List and Actions 57 5 2 1 Error 001 60 5 2 2 Error 003 62 5 2 3 Error 004 68 5 2 4 Error 012 69 5 2 5 Error 016 71 5 2 6 Error 030 73 5 2 7 Error 031 74 5 2 8 Error 046 75 5 2 9...

Страница 6: ...er or distributor not authorised by Navien Failure to perform regular maintenance misuse operation at settings other than those recommended or specified non compliance with instructions or guidelines...

Страница 7: ...as LP Propane Gas AP Air Pressure APS Air Pressure Sensor DHW Domestic Hot Water FM Fan Motor GARC Gas Air Ratio Control LPM Litre Per Minute MGV Main Gas Valve RPM Revolutions per Minute PCB Printed...

Страница 8: ...bour s phone call your gas provider and follow their instructions If you cannot reach your gas provider call the fire department Do not return to your home until authorised by your gas supplier or the...

Страница 9: ...explosion Do not place combustibles such as newspapers or laundry near the boiler or flue system Doing so may result in a fire Do not place or use hair sprays spray paints or any other compressed gas...

Страница 10: ...Very low scald risk CAUTION Do not turn on the boiler unless the water and gas supplies are fully opened Doing so may damage the boiler Do not turn on the water if the cold water supply shut off valv...

Страница 11: ...natural gas If LPG conversion is required use the conversion kit supplied with the boiler and attach the item matching the LPG GC No included in the kit The Codes of good practice and regulations refe...

Страница 12: ...NCB500 2S 41K 26 8 kW 41 0 kW By default the boiler assigns system priority to DHW supply The NCB500 Series boiler has a built in circulation pump 3 way valve assembly flow sensor DHW plate heat exch...

Страница 13: ...following diagram shows the key components of the boiler Component assembly diagrams and particular parts lists are included in the Appendices Fan Motor Front Panel Ignitor Flame Rod Circulation Pump...

Страница 14: ...ri Mixing Chamber Primary Heat Exchanger Secondary Heat Exchanger Return Adapter Filter Assembly Gas Valve Central Heating Return Pressure Relief Valve Central Heating Supply DHW Inlet DHW Outlet 3 Wa...

Страница 15: ...djustable over entire Max Min output range Type of heating installation Close circuit Max heating operation pressure bar 2 5 Max heating temperature C 90 Adjustable heating temperature range C 40 90 E...

Страница 16: ...80 125 m 27 Max vertical coaxial length 80 125 m 28 Equivalent elbow length 90 80 125 m 2 2 Equivalent elbow length 45 80 125 m 1 0 Equivalent length of adapter 60 100 80 125 m 0 5 Max dual duct lengt...

Страница 17: ...ter A Flue exhaust Air intake 60 100 80 125 B Central heating supply 22 mm C Hot water outlet DHW 15 mm D Gas supply inlet 22 mm E Cold water inlet DHW 15 mm F Central heating return 22 mm OverheadVie...

Страница 18: ...on the circuit board configures boiler type capacity burner type country and discharge of condensate function 1 2 3 4 5 6 7 8 ON DIP SW1 Switch Function Setting 1 Boiler Type SOLO ON COMBI OFF 2 Rese...

Страница 19: ...r Natural gas G20 Allowing for the acceptable pressure loss of 1 mbar across the installation pipework it can be assumed that a minimum permitted operating pressure of 18 mbar will be delivered to the...

Страница 20: ...n and is responsible for the connection utilization repair or servicing of gas utilization equipment or accessories who is experienced in such work familiar with all precautions required and has compl...

Страница 21: ...e Once the hex nut is loose carefully separate the pipe from the gas valve Procedure 1 Turn off both gas and water supply to the boiler 2 Unfasten the two latches at the top and remove two screws at t...

Страница 22: ...s detached from the gas valve find location B the connection above the gas valve where it is attached to the fan motor assembly Carefully remove the two screws by hand using a Phillips screwdriver and...

Страница 23: ...Figure 5 Inspect the Outer packing between the venturi andgasvalveinletadapterwhenevertheyaredisassembled The Outer packing must be in good condition and must be installed Failure to comply will cause...

Страница 24: ...d set the boiler to operate and proceed Gas Setup Wizard Note For proceeding Gas Setup Wizard for gas type selection refer to 4 4 4 Start Up Wizard on page 26 Measure the CO2 value at low fire If the...

Страница 25: ...he boiler s schedule programming operation is set f DHW preheat Displayed when the DHW preheat feature is enabled DHW preheat DHW Intelligent DHW preheat Always on DHW preheat Weekly DHW preheat off E...

Страница 26: ...eating and DHW supply temperatures Refer to the following table for detailed information a b c d e f a Menu button Access to the Main menu screen b Back button Access to the previous screen c OK butto...

Страница 27: ...appear on the front panel display after the power is turned on 4 4 4 Start Up Wizard The setup wizard should run the first time the unit is powered on The wizard must be completed before the boiler c...

Страница 28: ...on or the Down button until the desired temperature appears on the display You can adjust the temperature while the display is flashing Once the display stops flashing the temperature setting is store...

Страница 29: ...W Ver Panel firmware version Note The fan motor controls the APS so the fan target speed Fan Target RPM is only for your reference 4 4 7 Accessing Basic Menu Items In the Main Menu screen you can view...

Страница 30: ...ys Saturdays and Sundays 4 OFF NotUsed Disable the schedule function When the boiler is connected to an outdoor temperature sensor optional functioning may be activated according to outdoor temperatur...

Страница 31: ...ella Activate the Anti Legionella function and schedule The graph shows how the set temperature is determined K factor values can be set using the front panel 20 15 10 5 0 10 15 20 25 5 20 30 40 50 60...

Страница 32: ...cription 1 ECO Preheat OFF Turn off the DHW Preheat 2 ECO Intelligent Set to detect DHW usage for repeat the detected cycle 3 ECO Schedule Set the detect DHW usage for a week 4 Always Preheat Always t...

Страница 33: ...he preheat operation function has been used 6 Gas Consumption View monthly gas consumption 4 4 7 5 Viewing Error History To view the error history press the Menu button and then select 5 Error History...

Страница 34: ...mes Number of times a flame loss misfire has occurred 4 2nd ignition No of Times Number of second ignition attempts 5 3rd ignition No of Times Number of third ignition attempts 6 4th ignition No of Ti...

Страница 35: ...itch between the parameters or to increase decrease setting values Press the OK button to select a parameter or to confirm after making changes 4 4 8 2 Viewing Input and Output Status To view the boil...

Страница 36: ...for service notification Setting range 30 3650 days 10 years It can be set in 10 day increments Default 1820 days 5 years Press the Back button to return to the previous screen or menu Item Descripti...

Страница 37: ...Setting range 300 36500 cycles It can be set in 100 cycle increments Default 18200 cycles 20 Low Water Pressure Set the lowest operating pressure of the boiler 21 Recirc Pump DHW Usage Set a recircul...

Страница 38: ...ing maximum operation mode 4 DHW MAX Set the boiler to run in DHW maximum operation mode Item Description 3 3 Way Valve Test the 3 way valve operation The 3 way valve is turned on as soon as you enter...

Страница 39: ...mp Dip s w 8pin Dip s w 4pin BURNER HTL M 7 6 5 4 3 2 1 8 MIX V V CN10 OUTLET_Temp 5 4 3 6 2 CN12 HTL INLET_Temp 2 3 4 CN8 1 CN2 M 7 6 5 4 3 2 1 8 WAV V V CN11 P E 1 2 3 4 1 6 7 8 5 1 0 1 1 1 2 9 1 4...

Страница 40: ...ent Valve Flow Control DC15V Vent Separation Detector Supply Thermistor Outlet Thermistor 1 Return Thermistor UART Communication Interface FRONT PANEL Communication Interface FUSE Inlet Thermistor 1 E...

Страница 41: ...the unit Fault PCB malfunction Symptoms A system component may not operate and generate an error code In most PCB failures the boiler will not operate until the fault is resolved Error codes E515 E61...

Страница 42: ...ll activate the high limit switch Fault Unable to detect high water temperature conditions if the switch malfunctions Symptoms Unable to shut down the boiler if the water temperature from the heat exc...

Страница 43: ...s are secure and inspect for wire damage 2 Test the resistance of the sensor Before testing shut down the boiler and allow it to cool Testing inspection information Resistance range Refer to the table...

Страница 44: ...y 0 rpm 2 A fan assembly screw is loose and or the fan is disassembled 3 Disconnected or defective fan connection terminal assembly Symptoms 1 Erratic combustion 2 Vibration and noise coming from the...

Страница 45: ...ite the gas 2 Results in multiple unsuccessful ignition attempts Symptoms 1 The boiler does not ignite and error code E003 or E004 is displayed 2 The durability of the igniter reduces Error codes E003...

Страница 46: ...toms 1 The boiler does not ignite and error code E003 or E004 is displayed 2 Durability of the transformer wears down Error codes E003 E004 Diagnostics 1 Visual inspection Check wire connections are s...

Страница 47: ...o prevent unsafe situations Fault Unable to open close Symptoms 1 No flame 2 The boiler does not operate Error codes E003 E012 Diagnostics 1 Visual inspection Check wire connections are secure and ins...

Страница 48: ...to initiate or sustain combustion 2 Dust or soot deposits form on the burner s surface 3 Gas leakage from the burner Symptoms 1 Abnormal combustion 2 Unstable flame conditions and or flame loss 3 Igni...

Страница 49: ...etect or measure water flow rate 2 Damage to and or leakage from the water flow sensor Symptoms 1 Ignition does not start 2 Boiler operation stops when water leakage is detected Error codes E439 Diagn...

Страница 50: ...amber are used to minimise heat loss Fault 1 Water and or exhaust gas leaks 2 Scale deposits in the heat exchanger can cause water in the boiler to bubble Symptoms 1 Exhaust gas leaks 2 Overheating of...

Страница 51: ...he combustion chamber which minimises heat loss Fault 1 Water and or exhaust gas leaks 2 Scale deposits in the heat exchanger can cause water in the boiler to bubble Symptoms 1 Exhaust gas leaks 2 Ove...

Страница 52: ...ger filters the water in the space heating system to prevent faults in other parts of the heating system Fault 1 Water leaks 2 Low temperature water in the heat exchanger Symptoms DHW leaks and or tem...

Страница 53: ...r for obstructions 3 Voltage test Test the voltage meets the specifications shown below 4 Free a jammed pump rotor If a pump is not moving it may be a build up of debris in the pump which will prevent...

Страница 54: ...toms DHW supply stops and flow continues in the space heating system when the space heating water temperature is lower than the set point Error codes E016 Diagnostics 1 Visual inspection Check the 3 w...

Страница 55: ...o detect or measure changes of water pressure Symptoms The water top up system does not operate automatically Error codes E351 E352 E353 Diagnostics 1 Visual inspection Check the circulation pump s wi...

Страница 56: ...escription Function 1 Removes air from the system during heating 2 Relieves system pressure caused by expansion as the water temperature increases 3 Uses a built in low level water sensor to maintain...

Страница 57: ...ation E407 DHW Outlet thermistor Open or Short Circuit Alarm E421 DHW Inlet thermistor Open or Short Circuit Auto E434 Abnormal operation Flow control value Alarm E441 DHW Outlet 2 thermistor open or...

Страница 58: ...xchanger 6 Adjust the anti short cycle time E016 0 Heat exchanger overheat 1 Turn OFF the boiler wait at least 30 min and then restart the boiler 2 Clean the inlet water filter and strainer 3 Check th...

Страница 59: ...t error E407 1 Hot water outlet thermistor open error 1 Check the thermistor 2 Replace the thermistor 2 Hot water outlet thermistor short error E421 1 Cold water inlet thermistor open error 1 Check th...

Страница 60: ...ined in the table above do not resolve the boiler fault contact the Navien technical support team on 1 800 519 8794 To assist with fault resolution error codes are displayed on the front panel and sav...

Страница 61: ...e circulation pump Run it in test mode 2 Check the operation of the 3 way valves Run it in test mode 3 Check if the heating strainer is obstructed 4 Check if the main heat exchanger or the DHW heat ex...

Страница 62: ...r is obstructed by debris 2 Identify the type of debris caught in the strainer aluminium oxidised steel etc to help identify the cause of the obstruction Heating or DHW heat exchanger is obstructed 1...

Страница 63: ...and grounding 6 Check if the air pressure hose is broken or obstructed 7 Check if the air pressure sensor is operating correctly 8 Check the PCB DIP switch settings 9 Adjust the offset pressure 10 Ch...

Страница 64: ...e correct Is the gas valve open Check the flame rod Turn OFF the boiler Check that the gas valve is open or check the LP supply Check the connections Test the voltage between WHITE YELLOW at CONZ1 DC...

Страница 65: ...overtightened An overtight connection can deform the seal and obstruct the flow of gas 5 Check the class of pressure meter Digital pressure manometer Check gas supply pressure Deformed seal can obstr...

Страница 66: ...ks in the insulator Adjust the gap if discharge is visible Ensure that the insulating gasket is fitted between the electrode and burner casing Check the input voltage at the ignition transformer AC 23...

Страница 67: ...etween theYELLOW WHITE wires and verify the voltage is DC 24 V 2 If there is no voltage replace the PCB 3 If the voltage is correct check if the coil is open Check the resistance Check if the solenoid...

Страница 68: ...ensure there is good contact with the case Use a multimeter to test the spark current normally 3 4 A Test the spark current connectors Ground connection Flame loss and noise occurs at ignition Check f...

Страница 69: ...ed within the correct pressure range 4 Check the PCB and replace it if faulty Is there burner flame when there is no ignition External noise interference Clean or replace the flame rod Check the curre...

Страница 70: ...count If flame loss occurs 20 times consecutively error code 012E is displayed manually cleared on the front panel Checklist 1 Use a manometer to measure the gas supply pressure NG 17 25 mbar LP 25 3...

Страница 71: ...tightened An overtight connection can deform the seal and obstruct the flow of gas 4 Check the gas meter rating Flame loss and noise occurs after ignition PCB DIP switch setting error Check the PCB DI...

Страница 72: ...urge and starts the circulation pump Checklist 1 Check the overheat controller is working correctly Test the resistance or continuity 2 Check the hot water temperature sensor 3 Test the circulation pu...

Страница 73: ...ured at levels lower than it actually is test to confirm if the temperature sensor is faulty Check the output temperature displayed on the front panel 2 Measure the temperature sensor resistance and d...

Страница 74: ...oller detects the exceeding temperature of 110 C for 10 minutes or more E030 is displayed and a post purge will be performed Automatically cleared 2 When the controller detects the exceeding temperatu...

Страница 75: ...Defective overheat controller Faulty terminals on the exhaust gas overheat controller 110 C max Check the overheat controller s wiring connections If the resistance is incorrect replace the temperatu...

Страница 76: ...stance within the normal range Replace heat exchanger thermistor Check connections Step 1 Flush clean Filter Step 2 Restart Step 3 Replace PCB Yes Yes No No 5 2 9 Error 047 Error Conditions and Checkl...

Страница 77: ...ombustion and the boiler switches to Lock out mode The air volume sensor should be normal Checklist 1 Check if the fan motor works normally using the component test mode 2 Test the power supply to the...

Страница 78: ...instructions below to replace the fan 1 Unplug the boiler s power cable and wait 10 sec for all remaining SMPS voltage to completely discharge 2 Disconnect the fan cable and then re connect it 3 Recon...

Страница 79: ...ector is wet due to any reason including leakage 2 Replace the defective heat exchanger output temperature sensor 3 Check the circulation pump s operating status and the flow rate in the space heating...

Страница 80: ...sor is faulty if the resistance is 30k or higher Replace the temperature sensor if the resistance value is abnormal Check the temperature displayed on the front panel Possible Issues Circulation pump...

Страница 81: ...lays 218E on the front panel If this occurs the boiler initiates shutdown Checklist 1 Check if the heat exchanger input temperature sensor connector is wet due to any reason including leakage 2 Replac...

Страница 82: ...f the input water pressure sensor is wet for any reason including leakage 2 Check the auto feeder 3 Check the controller Is there a leak inside the boiler Is the water pressure sensor normal Check con...

Страница 83: ...the input water pressure sensor is wet for any reason including leakage 2 Check the controller Is there a leak inside the boiler Is the water pressure sensor normal 1 Check connections Repair the leak...

Страница 84: ...essure sensor is wet due to any reason including leakage 2 Replace the water pressure sensor 3 Check the controller Is there a leak inside the boiler Is the water pressure sensor normal 1 Check connec...

Страница 85: ...ected the system displays the 407E error on the front panel Check items 1 Check if the hot water temperature sensor connector is wet due to any reason and if the connector is connected properly 2 Chec...

Страница 86: ...0k or higher Replace the temperature sensor if the resistance value is abnormal Check the temperature displayed on the front panel Possible Issues Defective PCB If the issues continue despite checking...

Страница 87: ...e system displays the 421E error on the front panel Check items 1 Check if the cold water temperature sensor connector is wet due to any reason and if the connector is connected properly 2 Check if th...

Страница 88: ...or Check the resistance of the temperature sensor Defective if it is 40k or higher Replace the temperature sensor if the resistance value is abnormal Check the temperature displayed on the front panel...

Страница 89: ...valve Check the Fan voltage 1 Check the wire connection between dual venturi and Main controller 2 Check the dual venturi 1 Turn off and on the Power RESET switch 2 In that same case replace the Main...

Страница 90: ...items Check the PCB Error occurrence conditions and check items Fault Possible Causes Check method E594 Error Abnormal communication by PCB 1 Click the Reset button on Front panel 2 Turn the POWER to...

Страница 91: ...from Reset Curve Mode to Normal Mode Check items 1 Check the parameter setting 2 Check the outdoor sensor Is the Outdoor sensor installed properly Is the outdoor thermistor normal Check connecter Chan...

Страница 92: ...et the unit at MIN 1 If noise occurs at standard value adjust setting above below the standard 2 Gas supply error due to defective air pressure sensor 3 If the same error is repeated it is due to a de...

Страница 93: ...boiler The cold water temperature sensor may not be working properly Low hot water temperature Hot water setting error Check the hot water temperature setting on the front panel Water mixed with cold...

Страница 94: ...if the wire is fixed and properly attached on the main side of the heat exchanger Circuit breaker trips Normal assembly Short circuit due to defective assembly Wiring near the heat exchanger Circuit...

Страница 95: ...ce and operation after the boiler has been serviced To remove and replace any parts from the boiler you will need a screwdriver that is at least 8 10 inches long A flashlight and magnetic tip are also...

Страница 96: ...re to run the setup wizard and change to the existing setting 11 When the boiler is turned on press the Back button and the Menu button simultaneously for 3 seconds and then select 3 Parameter Setting...

Страница 97: ...d gas supply to the unit Note Do not over tighten the screws for the fan motor replacement with high torque drill This may cause damage to the part s 6 2 3 Fan Motor Combustion Air 1 Turn off the gas...

Страница 98: ...ower supply and gas supply to the unit Note Verify that the Ignition Transformer insulated cables are firmly connected to the flame rod 6 2 4 Flame Rod 1 Turn off the gas supply to the unit 2 Disconne...

Страница 99: ...rt 9 Reconnect the hose to the condensate trap 10 Reattach the condensation trap to the unit and secure it using the five screws 11 Replace the front panel to its original position 12 Turn on the wate...

Страница 100: ...e are no leaks at the flow sensor connections 6 2 8 Circulation Pump 1 Turn off the gas supply to the unit 2 Disconnect the unit from the power supply 3 Turn off the water supply to the unit 4 Loosen...

Страница 101: ...7 Connect the water pressure senor wire housing Note Always use proper O rings at the water pressure valve connection to ensure tight seals 6 2 10 3 way Valve 1 Turn off the gas supply to the unit 2...

Страница 102: ...gas supply to the unit 2 Turn off the 230V power supply to the unit 3 Turn off the water supply to the unit Drain all water from the appliance 4 Remove the gas supply unit 5 Remove the two screws at...

Страница 103: ...Remark 1 Cover 30030074A 2 Panel 30029172A 3 Controller 30028548A 4 Siphon 30029038A 5 Adapter 30029966A 6 Wind pressure sensor 30025533B 7 Tank 30029045A 8 Inlet adapter 30029947A 9 Valve 30030507A 1...

Страница 104: ...ransformer 30029732A 5 Fuse 30025036A 6 Dual venturi 30029315A 3S 54K 30029314A 2S 42K 7 Outlet adapter 30029538A 8 Inlet adapter 30013743A 9 Clip 20007733B 10 Electrode 30030059A 11 Packing 20051913A...

Страница 105: ...upply pipe 30029104A 9 Temperature sensor 30022222B 10 O ring 20033699A 11 Valve 30011532B 12 Clip 20033662A 13 Supply pipe 30029104A 14 3 way valve 30020637A 15 Heat exchanger 30029328A 30029327A 16...

Страница 106: ...ing the Return Filter YES NO Checking the Intake Air Filter YES NO Flushing the Heat Exchanger YES NO Replacement of Parts 8 3 Maintenance Schedules Owner maintenance Daily Check boiler area Check pre...

Страница 107: ...e lines per the Installation 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...

Страница 108: ...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...

Страница 109: ...as pressure and gas rate are satisfactory either Perform the full service For more information refer to 8 5 2 Full Service on page 108 Set the Gas Valve For more information refer to 4 2 Measuring the...

Страница 110: ...rackets 6 Loosen the three screws holding the front panel and remove the front panel Note When removing the front panel label all wires and make sure all wires are disconnected 7 Use a Phillips screwd...

Страница 111: ...solid support and be careful not to fall 13 As cleaning the heat exchanger is finished reassemble the parts 14 Check the CO For more information on measuring the CO refer to Checking the CO on page 1...

Страница 112: ...r to commissioning As part of the installation process especially where a flue has been fitted by persons other than the boiler installer visually check the integrity of the whole flue system to confi...

Страница 113: ...tegrity has been visually checked in accordance with the yellow Prior to CO and combustion ratio check box above before proceeding to the Check CO and combustion ratio at maximum rate stage below SET...

Страница 114: ...o operate at combustion to stabilise CHECK CO AND COMBUSTION RATIO AT MINIMUM RATE gas sampling point Allow readings to stabilise before recording Is CO less than 350ppm and CO CO2 ratio less than 0 0...

Страница 115: ...Memo...

Страница 116: ...Memo...

Страница 117: ...Memo...

Страница 118: ...Memo...

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