Buffalo NBB3 User manual

IS 619 ECN 3949 Page 1 of 10
Installation, Operating and Servicing
Instructions
Electric Auto-Fill Water Boilers
NBB3 AND NBB3F
Please make a note of your product details for
future use:
Date Purchased:_________________________
Model Number:__________________________
Serial Number:__________________________
Dealer:_________________________________
_______________________________________

IS 619 ECN 3949 Page 2 of 10
CONTENTS
Important Information
2
Warnings and Precautions
3
Technical Data
3
Checklist of Enclosures
3
Installation and Commissioning
3-5
Operating Instructions
5-7
Cleaning
7-8
Servicing, Maintenance and Component Replacement
8
Fault Finding
9
Service Information and Guarantee
10
IMPORTANT INFORMATION
Read these instructions carefully before using this product, paying particular
attention to all sections that carry warning symbols, caution symbols and notices.
Ensure that these are understood at all times.
WARNING!
This symbol is used whenever there is a risk of personal injury.
CAUTION!
This symbol is used whenever there is a risk of damaging your Buffalo product.
NOTE:
This symbol is used to provide additional information, hints and tips.
KEEP THIS MANUAL FOR FUTURE REFERENCE

IS 619 ECN 3949 Page 3 of 10
WARNINGS AND PRECAUTIONS
This appliance must be installed, commissioned and serviced by a qualified person
in accordance with national and local regulations in force in the country of
installation.
If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified person.
Ensure that the plug/socket is accessible at all times.
Strip plastic coating and clean the appliance before use.
During operation parts may become hot - avoid accidental contact.
Disconnect this appliance before servicing, maintenance or cleaning.
TECHNICAL DATA
Model
Height
(mm)
Width (mm)
Depth (mm)
Weight (kg)
NBB3
560
255
446
13
NBB3F
CHECK LIST OF ENCLOSURES
Instructions manual
Drip tray and insert
Inlet hose with ¾” BSP connection
INSTALLATION AND COMMISSIONING
This appliance must be earthed.
An equipotential bonding terminal is provided to allow cross bonding with other
equipment.
If replacing the plug connect the terminals as follows:
Green and Yellow wire Earth E
Blue wire Neutral N
Brown wire Live L

IS 619 ECN 3949 Page 4 of 10
Supply cords shall be oil resistant, sheathed flexible cable not lighter than ordinary
polychloroprene or equivalent elastomer sheathed cord (code 60245 IEC 57)
Install this appliance on a level surface ensuring all vents are unobstructed.
The serial plate is located on Fig 1 (F).
Model
Power
(kW)
Ambient
temperature Deg C
Water inlet
pressure (bar)
Water inlet
pressure (kPa)
NBB3, NBB3F
3.0
5 to 30
1 to 8
100 to 800
Electrical supply
The units are supplied with a 13 amp plug.
Water supply and waste connection (All)
Connect the supplied white water inlet hose to the inlet connection point on the
base of the boiler and the other end to the mains supply via an accessible isolating
tap with a ¾” BSP thread.
Use the hose set supplied with the appliance - any previous hose set is not to be re-
used.

IS 619 ECN 3949 Page 5 of 10
OPERATING INSTRUCTIONS
A
B
CD
E
FG
Fig 1
Only qualified or trained personnel should use this appliance.
First Use
Switch on the water and electricity supplies. Leave the boiler to fill for 30 minutes.
Drain off approximately 5 litres of water to remove any loose carbon particles from
the filter.

IS 619 ECN 3949 Page 6 of 10
Regular Operation
The boiler starts automatically when the water supply is turned on. During the
heating cycle, only small quantities of water are added to ensure hot water is
always available at the tap.
The boiler is designed to be permanently switched on: it is only necessary to turn it
off for de-scaling or maintenance.
Water is drawn off through the tap (E).
Adjustment –Water temperature, screen backlight and contrast
Consult Fig 1.
Turn power off and on again. The FilterFlow screen (B) is displayed on the control
panel (A).
Press and hold the power button (D) until the software version is displayed. Press
the function button Fn (C) and the temperature will be displayed.
Press the power button to cycle through the values 70-96 Deg C. Press the Fn
button to select the required value.
The backlight adjustment screen is displayed next. Press the power button to cycle
through values 1-25. Press the Fn button to select the required value.
The contrast adjustment screen is displayed next. Press the power button to cycle
through values 35-60. Press the Fn button to select the required value.
Press the power button to exit.
Standby
If the boiler is to be left unused for any length of time, turn the element off by
pressing the power button.
Filter replacement (NBB3F ONLY)
The filter display shows the estimated life remaining in the filter cartridge (Fig 2). A
reminder message is displayed when the filter needs changing. The boiler can be
used without a filter, but scale will build up quickly and water taste may be affected.

IS 619 ECN 3949 Page 7 of 10
Fig 2
To replace the filter:
Remove the drip tray
Twist the base of the filter (G) 90 degrees anti-clockwise and slide the cartridge out
of the appliance. It will contain a small amount of water.
Re- insert the filter into the recess and lock in place by twisting clockwise.
Press and hold the Fn button for 5 seconds to reset the filter life.
Drain off approximately 5 litres of water to remove any loose carbon particles from
the filter.
CLEANING
Do not use a water jet or steam cleaner, and do not immerse this appliance.
Clean all panels with warm water and mild detergent, do not use abrasive
materials. Dry with a soft cloth.
Slide out and empty the drip tray (H) regularly, and wipe the dispensing tap spout
daily to remove lime scale deposits.
De-scaling
The boiler should be de-scaled regularly to maintain efficient operation and water
quality. The frequency depends on the hardness of the water and timely
replacement of the filter.
The de-scaling procedure must be performed by trained personnel as it
requires the removal of panels from the boiler giving access to live electrical
components.
FILTER
READY
STANDBY
CLEAR
CHANGE
FILTER

IS 619 ECN 3949 Page 8 of 10
De-scaling the boiler at the end of the working day gives the de-scaling agent
several hours to work. Buffalo recommend our own de-scaling agent MS19,
available from our Spares department.
Wear protective clothing.
Isolate the boiler from the electrical supply.
Turn off the power and allow the water to cool to 60 Deg C.
Using a 3mm Allen key, remove the screw in the top of the boiler.
Remove the insulation from the top of the tank. Unscrew and remove the tank lid.
Add the de-scaling agent slowly to avoid eruption of the water, following the
manufacturer’s instructions.
Replace tank lid and outer lid and attach an ‘Out of Use’ notice to prevent use
during de-scaling.
Turn on the electricity and run the boiler normally for 30 minutes. Isolate the boiler
and allow the water to cool.
Remove both outer and tank lids again. Inspect the tank and level sensor housings
for scale deposits. If necessary repeat the de-scaling process.
Drain and flush all de-scaling agent as follows:
Remove the drip tray.
Remove the front panel by unscrewing the two screws behind the drip tray.
Connect a hose from the overflow pipe to a bucket and open the service valve to
drain the water from the tank.
Flush the tank with clean water, shut the valve and replace the front cover.
Replace the drip tray and tank lid, ensuring the gasket is sealing the top of the tank
correctly.
Re-fit the outer lid and turn on the boiler.
SERVICING, MAINTENANCE AND
COMPONENT REPLACEMENT
Other than replacing the filter, all servicing, maintenance and component
replacement on these appliances should be carried out by one of our recommended
service engineers.

IS 619 ECN 3949 Page 9 of 10
The control panel displays information that can help with fault diagnosis. Before
calling for service, draw off a litre of water, clear the fault code by pressing the Fn
button and turn the boiler off and on again at the supply. If the fault persists, call
service for advice.
Message displayed
Possible causes
Corrective action
FILTER DESCALE
CAUTION
SEE MANUAL
STANDBY CLEAR
Scale on level sensors
Boiler overfilling
Descale
Check water inlet valve
FILTER NO WATER
FAULT
SEE MANUAL
STANDBY CLEAR
Water turned off
Inlet hose kinked or
blocked
Water pressure too high or
low
Drain valve open
Check water supply and
drain valve
Call service if fault
persists
FILTER NOT HEATING
FAULT
SEE MANUAL
STANDBY CLEAR
Boil dry/overheat protector
tripped
Temperature sensor fault
Element failed
PCB fault
Faulty or loose connection
Check connections
Call service if fault
persists
FILTER THERMISTOR
FAULT
SEE MANUAL
STANDBY CLEAR
Temperature sensor fault
Call service
FAULT FINDING

IS 619 ECN 3949 Page 10 of 10
For help with the installation, maintenance and use of your Buffalo equipment,
please contact our service department:
UK: 0845 146 2887
For non-UK customers, please contact your local Nisbets dealer
All service work, other than routine cleaning should be carried out by one of our
authorised service agents. We cannot accept responsibility for work carried out by
other persons.
To ensure your service enquiry is handled as efficiently as possible, please tell us:
Brief details of the problem
Product code
All available on serial plate
Type number
Serial number
Nisbets reserve the right to carry out any work under warranty, given reasonable
access to the appliance, during normal working hours, Monday to Friday, 08:30 to
17:00.
GUARANTEE
This unit carries a comprehensive UK mainland 1 year warranty. The guarantee is
in addition to, and does not diminish your statutory or legal rights.
The guarantee does not cover:
Accidental damage, misuse or use not in accordance with the manufacturer’s
instructions
Consumable items (such as filters, glass, bulbs, slot toaster elements and door
seals.)
Damage due to incorrect installation, modification, unauthorised service work or
damage due to scale, food debris build-up, etc.
The manufacturer disclaims any liability for incidental, or consequential damages.
Attendance is based on reasonable access to the appliance to allow the authorised
technician to carry out the warranty work.
Service calls to equipment under warranty will be carried out in accordance with the
conditions of sale. Unless otherwise specified, a maximum of 15 minutes of
administrative time, not spent directly carrying out servicing work, is provided for
within the warranty. Any requirement for staff attending the call to spend greater time
than 15 minutes due to administrative requirements, such as on health and safety risk
assessments, will be chargeable at the prevailing rate.
SERVICE INFORMATION