A.O. Smith BFC Cyclone 28 Troubleshooting guide

0311704 / R2.4
BFC Cyclone
High Efficient Condensing
Water Heater
BFC 28/30/50/60/80/100/120
Installation, User and Service Manual
4222 / EN

A.O. Smith Water Heaters
Unit B7-B8 Armstong Mall
Southwood Business Park
Farnborough Hampshire
GU14 ONR UK
T : 0870 267 6484
[email protected]
www.aosmith.co.uk
A.O. Smith Europe
De Run 5305
PO Box 70
5500 AB Veldhoven
The Netherlands
Data is subject to change.

Preface
Copyright
Copyright © 2016 A.O. Smith Water Products Company
All rights reserved.
Nothing from this publication may be copied, reproduced and/or published by means of
printing, photocopying or by whatsoever means, without the prior written approval of
A.O. Smith Water Products Company.
A.O. Smith Water Products Company reserves the right to modify specifications in this
manual.
Trademarks
Brand names in this manual are registered trademarks of their respective owners.
Warranty
Refer to the appendix Warranty (see section 12.8) for the warranty provisions.
Liability
A.O. Smith accepts no liability for claims from third parties caused by:
unauthorized use
use other than stated in this manual
use other than in accordance with the General Conditions registered at the Chamber
of Commerce.
For more information, refer to the General Conditions. These are available on request, free
of charge.
We believe that this manual provides you with accurate and complete descriptions of all
relevant components. If you, nonetheless find errors or inaccuracies in this manual, please
inform A.O. Smith. This helps us to further improve our documentation.
Compliance
To safely produce domestic hot water, the design and construction of the BFC water
heaters is in accordance with:
the European Regulations 2016/426 on appliances burning gaseous fuels (GAR).
the European Standard for Gas–fired storage water heaters for the production of
domestic hot water (EN89).
The European ECO-Design Directive.
The European Energy Labeling Directive
Refer to the appendix Declaration of conformity.
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0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17 3

Regulations
Gas Safety (installations and Use) Regulations 1998 (as
amended).
It is law that all gas appliances are installed by competent persons, in accordance with the
above regulations. Failure to install appliances correctly could lead to prosecution. It is in
your own interest and that of safety, to ensure that this law is complied with.
The installation of the water heater MUST be in accordance with the relevant requirements
of the Gas Safety Regulations, Building Regulations, IEE Regulations and the Water Supply
(water fittings) Regulations. The installation should also be in accordance with any
relevant requirements of the HSE, local gas region and local authority and the relevant
recommendations of the following documents:
British and European Standards
BS 6891:
Installation of low pressure gas pipework of up to 35 mm (R1¼) in domestic
premises (2nd family gas) - Specification. Note: for lager installations see IGE/UP/2
below.
BS 6798:
Specification for installation and maintenance of gas-fired boilers of rated input not
exceeding 70 kW net.
BS 6644:
Specification for installation of gas-fired hot water boilers of rated inputs between 70
kW (net) and 1.8 MW (net) (2nd and 3rd family gases).
BS 6700:
Design, installation, testing and maintenance of services supplying water for
domestic use within buildings and their cartilages - Specifications
BS EN 806-2:
Specification for installations inside buildings conveying water for human
consumption. Part 2: Design.
BS 5546:
Specification for installation of hot water supplies for domestic purposes, using gas-
fired appliances of rated input not exceeding 70 kW.
BS 5440:
Flueing and ventilation for gas appliances of rated input not exceeding 70 kW net
(1st, 2nd and 3rd family gases).
Part 1: Specification for installation of gas appliances to chimneys and for
maintenance of chimneys.
Part 2: Specification for installation and maintenance of ventilation for gas
appliances.
Institute of Gas Engineers and Managers (IGEM) Publications
IGE/UP/1:
Soundness testing and purging of industrial and commercial gas installations.
IGE/UP/1A:
Soundness testing and direct purging of small low pressure industrial and commercial
natural gas installations.
IGE/UP/2:
Gas installation pipework, boosters and compressors on industrial and commercial
premises.
IGE/UP/10:
Installation of flued gas appliances in industrial and commercial premises.
CIBSE Publications
Guide G:
Public Health Engineering
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Contact information
If you have any comments or questions, please contact:
A.O. Smith Water Products Company
Adress: PO Box 70
5500 AB Veldhoven
The Netherlands
Telephone: 0870 - AOSMITH (free)
0870 - 267 64 84
General: [phone]
Fax: [phone]
E-mail: [email protected]
Website: www.aosmith.co.uk
In the event of problems with your gas, electricity or water supply connections, contact
your supplier.
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About this manual
Scope
This manual gives information about safe and correct use of the water heater and how
installation, maintenance and service activities have to be done correctly. You must obey
the instructions in this manual.
Caution
Read this manual carefully before you start the water heater. It can cause personal injury
and damage to the water heater when you do not read the manual and/or do not obey
the instructions.
The purpose of this manual is to:
describe the working principles and layout of the water heater
explain the safety devices
highlight possible hazards
describe the use of the water heater
describe the installation, service and maintenance of the water heater
This manual has two parts:
An User part that describes the correct usage of the water heater.
An Installation, Maintenance and Service part, that describes the correct installation
and maintenance procedures.
Target group
The information in this manual applies to three target groups:
users
installation engineers
service and maintenance engineers
The User part is intended for the (end) users. The Installation, Maintenance and Service
part is intended for the installation engineers and the service and maintenance engineers.
Notation conventions
This manual uses the following text conventions:
Numbers between parentheses e.g. (1), refer to elements in a figure that are
described by the text.
Texts displayed on the user interface always are shown similar to the characters in
the display, for example WEEK PROGRAM, SETTINGS.
Buttons are always shown between brackets, for example: [ ], [ENTER], [RESET].
Cross-references to sections, tables, figures etc. are underlined and written as (see
section "..."). In the digital version, the cross-references function as hyperlinks that
can be used to navigate through the manual by clicking on them. Example: Safety
(see section 2).
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This manual contains the following text styles/symbols for situations that may endanger
users/engineers, cause damage to equipment or need special attention:
Note
A note gives more information on a topic.
Caution
Obey the caution instructions to prevent damage of the water heater.
Warning
Obey the warning instructions to prevent danger of personal injury, and serious damage
to the water heater.
Document identification
Article number Language Version
0311704 EN 2.4
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Table of Contents
Preface........................................................................................ 3
Copyright.......................................................................... 3
Trademarks....................................................................... 3
Warranty...........................................................................3
Liability.............................................................................3
Compliance....................................................................... 3
Regulations....................................................................... 4
Contact information............................................................ 5
About this manual....................................................................... 7
Scope............................................................................... 7
Target group..................................................................... 7
Notation conventions.......................................................... 7
Document identification.......................................................8
User part.................................................................. 13
1 Introduction.............................................................................. 15
2 Safety........................................................................................17
3 Interface................................................................................... 19
3.1 Operator interface............................................................ 19
3.2 Explanation of icons.......................................................... 19
3.3 Control switch.................................................................. 20
3.4 Buttons........................................................................... 20
3.5 PC connection.................................................................. 20
3.6 Status of the water heater................................................. 21
3.6.1 Operating modes.............................................................. 21
3.6.2 Error conditions................................................................22
3.6.3 Service conditions.............................................................23
3.6.4 Anode warning................................................................. 23
4 Use............................................................................................ 25
4.1 Turn on the water heater...................................................25
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4.1.1 The appliance's heating cycle............................................. 25
4.2 Turn off the water heater...................................................27
4.2.1 Turn off for a short period..................................................27
4.2.2 Isolate from the mains...................................................... 28
4.2.3 Turn off for a long period...................................................28
4.3 Main menu...................................................................... 29
4.3.1 Notation conventions for menu-related instructions............... 29
4.3.2 Switching to ON mode.......................................................30
4.3.3 Setting the water temperature........................................... 30
4.3.4 Week program................................................................. 30
4.3.5 Starting and stopping the week program............................. 31
4.3.6 Changing the appliance's standard week program................. 31
4.3.7 Adding times to a week program........................................ 34
4.3.8 Deleting times from a week program...................................35
4.3.9 Extra period.....................................................................36
4.3.10 Settings.......................................................................... 38
Installation, Maintenance and Service part.............. 41
5 Introduction.............................................................................. 43
5.1 About the water heater..................................................... 43
5.2 The appliance's heating cycle............................................. 43
5.3 Working principle..............................................................43
5.4 Operating cycle................................................................ 45
6 Safety........................................................................................47
6.1 Safety instructions............................................................47
6.2 Instructions on the water heater.........................................48
6.3 Safety devices..................................................................49
6.3.1 Protection for the water heater...........................................49
6.3.2 Safety of the installation....................................................50
6.4 Environmental aspects...................................................... 50
6.4.1 Recycling.........................................................................50
6.4.2 Disposal.......................................................................... 51
7 Installation............................................................................... 53
7.1 Packaging........................................................................53
7.2 Conditions....................................................................... 53
7.2.1 Ambient conditions........................................................... 53
7.2.2 Maximum floor load.......................................................... 53
7.2.3 Water composition............................................................54
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