Baxi Megaflo 2 System 24 Compact GA Instruction Manual

© Baxi Heating UK Ltd 2013
Please keep these instructions in a safe place.
If you move house, please hand them over to the next occupier.
User’s Operating Instructions &
Important Warranty Information
Megaflo2System24Compact
Gas Fired Wall Mounted Condensing
System Boiler

2© Baxi Heating UK Ltd 2013
© Baxi Heating UK Ltd 2013 All rights reserved. No part of this publication may
be reproduced or transmitted in any form or by any means, or stored in any
retrieval system of any nature (including in any database), in each case whether
electronic, mechanical, recording or otherwise, without the prior written
permission of the copyright owner, except for permitted fair dealing under
Copyrights, Designs and Patents Act 1988.
Applications for the copyright owner’s permission to reproduce or make other
use of any part of this publication should be made, giving details of the proposed
use, to the following address:
The Company Secretary, Baxi Heating UK Limited,
Brooks House, Coventry Road, Warwick. CV34 4LL
Full acknowledgement of author and source must be given.
WARNING: Any person who does any unauthorised act in relation to a
copyright work may be liable to criminal prosecution and civil claims for damages.
1.0 Quick Reference Guide 3
2.0 Troubleshooting 4
3.0 Temperature Adjustment &
Care of the Boiler 6
4.0 Repressurising System & ‘Service Due’ 7
5.0 Clearances 8
6.0 Error Codes 9
7.0 Legislation 10
8.0 Emergency 11
9.0 Warranty & Service Back page
egaPnoitceS
Contents
Boiler Controls - see opposite page for
Operating Quick Reference Guide
(Fascia Cover removed for clarity)
0086
ISO 9001
FM 00866
The Benchmark Scheme
Baxi Heating UK Ltd is a licensed member of the Benchmark Scheme which aims
to improve the standards of installation and commissioning of domestic heating
and hot water systems in the UK and to encourage regular servicing to optimise
safety, efficiency and performance.
Benchmark is managed and promoted by the Heating and Hotwater Industry
Council. For more information visit www.centralheating.co.uk
Model Range
Baxi Megaflo 2 System 24 Compact
G.C.No.41-075-92

1.0 Quick Reference Guide
3
© Baxi Heating UK Ltd 2013
R
R
Boiler in Standby (frost protection still enabled)
Error
Indicates errors that prevent burner from igniting
Error - Not resettable by user
Water pressure too low
Indicates an error resettable by the user
Indicates navigation in programming mode (parameter)
Indicates navigation in programming mode
Burner lit
Boiler On mode (symbol will flash with demand)
Units for temperature
Units for pressure
Service due (see 4.2)
Display Description
Central Heating
Temperature Adjustment
Boiler Information View Standby - Reset - Esc
R
Standby - Reset - Esc Button
Boiler Information View Button
Increase Central Heating Temperature Button
Decrease Central Heating Temperature Button
Inactive Button
Inactive Button
On/Off Selector Button
Key to Controls
R
When is displayed (Boiler On) the boiler will respond to
timed Heating or Hot Water demand.
N.B. If only is displayed the boiler will not operate !
THESE BUTTONS INACTIVE
On/Off Selector Button
NOTE: When altering any settings it is necessary that
the buttons are FIRMLY pressed for several seconds.
Display showing all available segments

2.0 Troubleshooting
4© Baxi Heating UK Ltd 2013
Boiler not working
START
Make sure the gas
supply is turned ON
and check if other
gas appliances are
operating (e.g. fire,
cooker).
NO
If no gas, consult
your supplier.
Is there electricity to the
boiler ? Is the display lit ?
R
Check electrical supply to
boiler is switched on.
NO
YES Is the Burner Flame
symbol showing ?
R
Burner Flame
(Indicates burner
is on)
Boiler operating
satisfactorily.
NO
YES
YES
YES Is the E and R symbol
illuminated or flashing ?
R
YES
Press the Reset Button
Error
Symbol
If it does
not reset
CONTACT YOUR
INSTALLER OR
SERVICE
ENGINEER.
R
Reset
Symbol
Is the Spanner symbol
illuminated or flashing ?
YES
Spanner
Symbol
Boiler
Temperature
Central Heating
Error Code
Flame
Failure
OR
Reset Button

2.0 Troubleshooting
5
© Baxi Heating UK Ltd 2013
Is the Timer ON and
calling for heat ?
Is the Room Thermostat (if
fitted) set high enough ?
12
1
2
3
4
5
6
7
8
9
10
11
Typical
examples of
external timer
Ensure timer is set for Central
Heating ON (see any
instructions supplied with timer)
NO
YES YES
NO
15
10
5
20
25
15
10
5
20
25
Turn Room Thermostat
to maximum setting
(typical example shown)
If you don’t know what you need to do
to get the boiler to light, or need help
with the system and controls, contact
your installer as soon as possible
CH ON CH OFF
bar
0
1
2
3
4
Is the Central Heating
System Pressure between 1
and 2.5 bar ?
If the reading* falls below 1 bar repressurise
the system as described in section 4.1.
NO
R
As pressure reduces Error Code 118 will
begin to flash. Once the pressure is less
than 0.5 bar the boiler will not operate &
118 will be displayed constantly
YES
*To check the water pressure
press until is displayed.
This will alternate with the system
pressure.
(NOTE: When the pump is running
the gauge under the boiler may
show a slightly different reading to
the display)

3.0 Temperature Adjustment &
Care of the Boiler
6© Baxi Heating UK Ltd 2013
R
3.1 To adjust the central heating temperature
1. Press to increase the boiler temperature.
2. Press to decrease the boiler temperature.
NOTE: An overheat thermostat (NTC) is positioned in the
heat exchanger which shuts down the appliance if the
boiler temperature exceeds 100°C. Press button to
re-establish normal operating conditions.
3.2 Boiler On Selector
1. Press the button until the Boiler On mode
appears:-
3.2 Cleaning the Outer Case
1. The painted panels should be wiped with a damp cloth and
then dried completely. DO NOT USE ABRASIVE CLEANING
AGENTS.
3.5 Boiler Frost Protection
1. The boiler incorporates an integral frost protection feature
that will operate in both Central Heating & Domestic Hot
Water modes, and also when in standby ( displayed).
2. If the boiler temperature falls below 5° C, then the boiler
will operate until the water temperature has been raised.
3. Further protection may be required for the system. Consult
your installer for details.
3.6 Information Display
1. The table opposite shows information that can be displayed
by pressing the button.
2. Depending upon boiler model and any system controls
connected to the appliance, not all information codes will be
displayed and some that are will not have a value.
3. Press to return to the normal display.
Central Heating
Temperature Adjustment
R
Display Screen
R
The button can be pressed so that the display shows
the following information:-
‘00’ alternates with Sub-Code (only when fault on boiler) or ‘000’
‘01’ alternates with CH Flow Temperature
‘02’ alternates with Outside Temperature (where Sensor fitted)
‘03’ alternates with DHW Temperature
‘04’ alternates with DHW Temperature
‘05’ alternates with System Water Pressure
‘06’ alternates with CH Return Temperature
‘07’ alternates with Flue Temperature
‘08’ - not used
‘10’ alternates with Zone 1 CH Flow Temperature
‘11’ alternates with Zone 2 CH Flow Temperature
‘12’ alternates with Ion current
‘13’ alternates with Burner working hours
‘14’ alternates with Zone 1 CH mode
‘15’ alternates with Zone 2 CH mode
‘16’ alternates with DHW circuit operating mode
‘17’ alternates with Boiler operating mode
‘18’ alternates with Solar plant operating mode
‘19’ alternates with Manufacturer information
‘20’ alternates with Manufacturer information
R
On/Off Selector Button
THESE BUTTONS
INACTIVE

7
© Baxi Heating UK Ltd 2013
bar
0
1
2
3
4
bar
0
1
2
3
4
4.1 Central Heating System Pressure
1. The normal operating water pressure is between 1
and 2.5 bar (Fig. 1). If the pressure exceeds 3 bar the
safety pressure valve will operate and a fault is indicated
(E117 displayed). Contact your installer.
2. It may be necessary to repressurise the system
occasionally (as Fig. 2 or E118 displayed). A filling device
(the filling loop) will be fitted on the system. This will be
on the boiler itself, or on pipework near to the boiler.
3. If you are unsure of its position, or cannot identify it,
consult the installer who fitted the boiler.
Note: It is recommended that repressurising is
performed when the boiler & system are cool.
4. The filling loop supplied consists of two taps and a
separate copper pipe with connection fittings.
5. Only when repressurising should the copper pipe be
connected between the two taps. Ensure that the nuts
on the pipe ends are tightened onto the taps.
6. Fully open one of the taps first, and then while
watching the pressure gauge, carefully open the second
tap.
7. The system pressure is shown at all times on the
gauge under the boiler and can be viewed on the display
when there is power to the boiler.
8. To check the water pressure press until is
displayed. This will alternate with the system pressure.
(NOTE: When the pump is running the gauge under the
boiler may show a slightly different reading to the
display).
9. When the needle on the gauge or figures on the
display indicate 1 or more turn both taps off.
10. Disconnect the copper pipe from the taps (a small
amount of water may be present) and remove it. Keep
the pipe in a safe place for future use.
4.2 ‘Service Due’ Message
1. After 11 months operation the ‘Service Due’ message will
be shown on the boiler display.
2. Please contact ‘heateam’ - The Service Division of Baxi to
arrange your Annual Service. You can contact ‘heateam’
0844 241 2502 or e-mail [email protected]
Normal Pressure
Requires
Repressurising
Pressure Gauge
Front, Side Panel and
Control Box
removed for clarity View Under
Appliance
R
‘Service Due’
Message
‘Sd’ will show for
three seconds,
alternating with the
boiler temperature.
Fig. 1
Fig. 2
4.0 Repressurising System &
‘Service Due’

5.0 Clearances
8© Baxi Heating UK Ltd 2013
5.1 For your Safety
1. This appliance must have been installed in accordance
with the manufacturer’s instructions and the regulations in
force.
2. Any modification that may interfere with the normal
operation of the appliance without express written
permission from the manufacturer or his agent could
invalidate the appliance warranty. In GB this could also
infringe the Gas Safety (Installation and Use) Regulations.
3. Your boiler must not be operated without the casing
correctly fitted.
4. Do not interfere with any sealed components on this
boiler.
5. Take note of any warning labels on your boiler.
6. Your boiler should have the following minimum
clearances for Safety and Maintenance
(Figs. 3 & 4):-
Top - 175mm
Bottom - 150mm*
Left side - 5mm
Right Side - 5mm
Front - 5mm (In Operation)
- 450mm (For Servicing)
*This is MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
7. If your boiler is installed in a compartment, do not use it
for storage purposes. Do not obstruct any purpose
provided ventilation openings.
8. Flammable materials must not be stored in close
proximity to your boiler.
9. Avoid skin contact when your boiler is in operation, as
some surfaces may get hot e.g. pipework.
10. Ensure that the flue terminal, outside the house, does
not become damaged or obstructed, particularly by foliage.
11. It is important that the condensate drain system is not
blocked, modified or damaged in any way as this would
affect the operation of your boiler. Your installer should
have insulated any exposed pipework (Fig. 5).
GB - Heating Industry definition meaning England, Scotland,
Wales, Northern Ireland, Isle of Man and the Channel Isles
150mm* Min
5mm Min
5mm Min
5mm
450mm
For Servicing
Purposes
Fig. 3
Fig. 4 In Operation
At least
1.5°
300mm
(290mm with flap removed)
175mm Min (300mm Min if
using 80/125 flue system)
Boiler
2.5° Minimum fall
50mm per metre of pipe run
Any pipe outside MUST be
insulated. If the pipe run
inside is in an unheated area
it must also be insulated.
Example of condensate
drain system
Fig. 5
390mm
700mm

6.0 Error Codes
9
© Baxi Heating UK Ltd 2013
6.1 List of Error Codes
1. When an error occurs the display will show one of two
symbols: or .
In both cases the display will also show symbol and the
numeric value of the error (see the “error table” below).
2. When the spanner is displayed the error cannot be
reset by the user. Please contact ‘heateam’ - The Service
Division of Baxi on 0844 241 2502 or e-mail
[email protected]
3. fault errors can be reset by pressing the button
and holding for two seconds.
WARNING: If an error code different from those
described opposite appears on the display or a certain fault
appears frequently, contact ‘heateam’.
RR
Table Of Error Codes
R
Central Heating NTC Fault
Flue NTC Fault
Central Heating Return NTC Fault
Safety Thermostat Operated (pump fault or air in primary)
Safety Thermostat Operated (over temperature)
Primary System Water Pressure Too High
Primary System Water Pressure Too Low
Circulation Fault (Primary)
Flame Failure (no lock-out)
Flue NTC Operated
Interruption Of Gas Supply or Flame Failure
Flame Failure
Fan or Fan Wiring Fault
False Flame
20
28
40
110
111
117
118
125
128
130
133
151
160
384
R
R
R
R
R
R

10 © Baxi Heating UK Ltd 2013
7.0 Legislation
7.1 Installation, Commissioning, Service & Repair
1. This appliance must be installed in accordance with the
manufacturer’s instructions and the regulations in force. Read
the instructions fully before installing or using the appliance.
2. In GB, this must be carried out by a competent person as
stated in the Gas Safety (Installation & Use) Regulations.
3. Definition of competence: A person who works for a Gas
Safe registered company and holding current certificates in the
relevant ACS modules, is deemed competent.
4. In IE (Eire), this must be carried out by a competent person
as stated in I.S. 813 “Domestic Gas Installations”.
Lifting - This product should be lifted and handled by two
people. Stooping should be avoided and protective equipment
worn where necessary. Carrying & lifting equipment should be
used as required, e.g. when installing in a loft space.
All Gas Safe registered engineers carry an ID card with their
licence number and a photograph. You can check your
engineer is registered by telephoning 0800 408 5500 or online
at www.gassaferegister.co.uk
The boiler meets the requirements of Statutory Instrument
“The Boiler (Efficiency) Regulations 1993 No 3083” and is
deemed to meet the requirements of Directive 92/42/EEC on
the energy efficiency requirements for new hot water boilers
fired with liquid or gaseous fuels:-
Type test for purpose of Regulation 5 certified by:
Notified Body 0085.
Product/Production certified by:
Notified Body 0086.
Ref: 86-BL-647
For GB/IE only.
7.2 Benchmark Commissioning Checklist
1. Please ensure that the installer has fully completed the
Benchmark Checklist on the inside back pages of the
installation instructions supplied with the product and that you
have signed it to say that you have received a full and clear
explanation of its operation. The installer is legally required to
complete a commissioning checklist as a means of complying
with the appropriate Building Regulations (England and
Wales).
2. All installations must be notified to Local Area Building
Control either directly or through a Competent Persons
Scheme. A Building Regulations Compliance Certificate will
then be issued to the customer who should, on receipt, write
the Notification Number on the Benchmark Checklist.
3. This product should be serviced regularly to optimise its
safety, efficiency and performance. The service engineer should
complete the relevant Service Record on the Benchmark
Checklist after each service.
4. The completed Benchmark Checklist may be required in the
event of any warranty work.

8.0 Emergency
11
© Baxi Heating UK Ltd 2013
If you smell gas
Do not operate light switches
Do not operate any electrical equipment
Do not use a telephone in the hazardous area
Extinguish any naked flame and do not smoke
Open windows and doors in the hazardous area
Turn off the gas supply at the meter
Warn any other occupants and vacate the premises
Telephone the National Gas Emergency Service on:-
0800 111 999
Faulty boiler
If it is known or suspected that there is a fault on the
boiler that cannot be manually reset, it must not be
used until the fault has been corrected by a competent
person.
Warning !
In an Emergency
1. If a water or gas leak occurs or is suspected, the boiler
can be isolated at the inlet valves by turning their taps
through 90° (1/4turn) downwards
2. Please contact your Installer, Annual Service Provider or
‘heateam’ - The Service Division of Baxi. You can contact
‘heateam’ on telephone number 0844 241 2502 or e-mail
[email protected] as soon as possible.
Yellow Tap - Gas
Black Taps - Water

© Baxi Heating UK Ltd 2013
All descriptions and illustrations provided in this leaflet have been carefully
prepared but we reserve the right to make changes and improvements in
our products which may affect the accuracy of the information contained in
this leaflet. All goods are sold subject to our standard Conditions of Sale
which are available on request.
Serial Number
Date of Installation
Installer Details (name, address and contact number(s))
Please complete the boxes below
BAXI
A Trading Division of Baxi Heating UK Ltd (3879156)
Brooks House, Coventry Road, Warwick. CV34 4LL
Website www.baxi.co.uk
e&oe
DDMYY
M
Comp No. 7211747-01 (5/13)
Lift Flap for access to
Information Label
9.0 Warranty & Service
Standard Warranty Terms & Conditions
Your free 2 year warranty will be pre-registered.
It is also a requirement of the warranty that the boiler has an annual service
(every 12 months) in accordance with the installation and servicing
instructions, performed by a Gas Safe registered engineer.
If you would like heateam to carry this out please call on 0844 241 2502 or
e-mail [email protected].
Our promise to you
If you experience a fault with your new boiler, we aim to provide a safe and
high quality repair service supported by our dedicated national network of
highly skilled engineers. If your installer can’t resolve the problem for you, we
will do everything we can to get an engineer out to you as quickly as possible.
Nothing in this warranty will affect your statutory consumer rights.
What you need to do if you experience a problem with your heating system
or the operation of the boiler
You should always contact your installer first, because the cause of the fault
may not be related to the boiler. If your installer confirms that the fault is with
the boiler and he/she can’t repair it, our friendly customer service team is on
hand to help. Simply call our service division heateam on 0844 241 2502 or
e-mail [email protected] to book an engineer visit or for any
general advice that you may need. Our contact centre is open Monday to
Friday 8am - 6pm, weekends and Bank Holidays 8.30am - 2pm, excluding
Christmas Day and New Years Day.
When contacting heateam it would be helpful if you could have the following
information to hand:-
1 Boiler serial number (see opposite).
2 Boiler make and model number.
What this warranty covers
Free of charge repair or replacement of components found to be of faulty
manufacture.
Free of charge replacement of the complete unit provided always that the
failure is related to a manufacturing fault that cannot be repaired or is
uneconomic to repair.
What this warranty does not cover
Repairs to boilers which haven’t been installed and commissioned properly,
and as set out in the installation instructions (this includes the need to flush the
system effectively and add a suitable corrosion inhibitor).
Any damage caused by hard water scale deposits and/or aggressive water
resulting from corrosion.
Any other defects or failures, either in the connected heating system or
outside of the boiler itself.
Faults caused by inadequate supply of electricity, gas or water to the property.
Installations within commercial settings for which this boiler was not designed.
Reimbursement of any third party repair or replacement costs that we haven’t
been told about or agreed with you in advance.
Compensation for consequential losses (e.g. loss of earnings, business losses,
stress and inconvenience) arising from a production breakdown, including
repair delays caused by factors outside our reasonable control.
After Sales Service 0844 241 2502 or e-mail [email protected].