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User’s 
Information 
Manual

 

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These appliances are for use with natural gas or LPG.  
(An LPG conversion kit is included with the boiler.)

 

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Type: B23-B33-B53-C13-C33-C43-C53-C63-C83

Gas

Model

GC Number

Natural Gas

NCB-24LDWE
NCB-28LDWE
NCB-34LDWE
NCB-40LDWE

47-709-01
47-709-02
47-709-03
47-709-04

LPG

NCB-24LDWE
NCB-28LDWE
NCB-34LDWE
NCB-40LDWE

47-709-05
47-709-06
47-709-07
47-709-08

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Condensing Combi Boiler

WARNING

If the information in these instructions is not followed exactly, a fire or explosion 
may result, causing property damage or personal injury.

 

Do not store or use petrol or other flammable vapours and liquids in the vicinity of this or 
any other appliance.

 

WHAT TO DO IF YOU SMELL GAS

 

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Do not try to light any appliances.

 

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Do not touch any electrical switch; do not use any phone in your building.

 

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Immediately call the National Gas Emergency Helpline on (Freephone) 0800 111999 or your gas 
supplier from a neighbour’s phone. Follow the instructions received.

 

Installation and service must be performed by a Gas Safe registered installer, service 
agency or the gas supplier.

Summary of Contents for NCB-24LDWE

Page 1: ...ing Combi Boiler WARNING If the information in these instructions is not followed exactly a fire or explosion may result causing property damage or personal injury Do not store or use petrol or other...

Page 2: ...perating the Boiler 10 3 1 Turning the Boiler On or Off 10 3 2 Adjusting the Temperature 10 3 3 Viewing Basic Information 11 3 4 Setting Summer and Winter Mode 12 3 5 Resetting the Boiler 12 3 6 Setti...

Page 3: ...dge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved Children shall not play with the appliance Cleaning and user ma...

Page 4: ...result in fire or explosion Do not place combustibles such as newspapers or laundry near the boiler or flue system Doing so may result in a fire DANGER HOT BURN To prevent burns Use the lowest operat...

Page 5: ...ything other than its intended purpose as described in this manual Do not place or use hair sprays spray paints or any other compressed gases near the boiler or flue system including the flue terminat...

Page 6: ...ntry 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 EC Conformity Declaration 0063 Navien hereby decla...

Page 7: ...initiates a safety heating cycle to prevent internal equipment damage due to freezing temperatures Short Circuit Protection Any short circuit occurring in the boiler s electrical circuit immediately...

Page 8: ...ion Refer to the following table for detailed information a h g b c d i j k l m e f a Space heating mode b Digital display Indicates space heating mode operation c L m L m d DHW mode Indicates water f...

Page 9: ...ration such as space heating and DHW supply temperatures Refer to the following table for detailed information e a b c d f g h a Summer Winter button b Space heating button Changes the mode between su...

Page 10: ...r temperature carefully read To prevent burns on page 4 Water above 52 C can cause instant scalding or severe burns To adjust the water temperature 1 Make sure that all hot water taps are closed and e...

Page 11: ......

Page 12: ...message appears you can try resetting the boiler to resolve the problem To reset the boiler press the Reset button If resetting the boiler does not solve the problem refer to the Troubleshooting sect...

Page 13: ...and Down buttons at the same time for 5 seconds Lock is displayed for 2 second Display Description Disables all control panel buttons Unlocking the Front Panel Press and hold the Up and Down buttons...

Page 14: ...de enough draw at least 1 9 litres of water per minute LPM through the boiler Is an error code displayed on the front panel If an error code is displayed refer to 4 2 Understanding Error Codes on page...

Page 15: ...ly thermistor open or short circuit Auto reset 218 Heating return thermistor open or short circuit Alarm 302 Low water pressure Auto reset 352 High water pressure Auto reset 353 Abnormal operation Wat...

Page 16: ...nnual service must be carried out by a suitably qualified and Gas Safe registered installer every year after installation 1 Navien Warranty registration is simple Just complete the Warranty Registrati...

Page 17: ...gy efficiency class A A A A Rated heat output kW 20 23 28 33 Space heating annual energy consumption GJ 37 43 52 57 Water heating annual electricity consumption kWh 66 65 45 46 Water heating annual fu...

Page 18: ...Memo...

Page 19: ...Memo...

Page 20: ...cal Assistance Service TAS first Contact the technician or professional who installed your boiler Contact a Gas Safe Registered engineer When contacting an official Technical Assistance Service TAS pl...

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