Ideal Heating LOGIC SYSTEM 2 S15 User manual

When replacing any part on this appliance, use only spare parts that you can be assured conform to the safety and performance
specification that we require. Do not use reconditioned or copy parts that have not been clearly authorised by Ideal Heating.
For the very latest copy of literature for specification and maintenance practices visit our website idealheating.com
where you can download the relevant information in PDF format.
USER GUIDE
October 2022
UIN 228297 A05
LOGIC SYSTEM2
S15 S18 S24 S30

2
User Guide
USER
1.1 Introduction ...................................................................3
1.2 Boiler Operation..........................................................3-4
1.3 Condensate Drain.......................................................4-5
1.4 General Information.......................................................5
1.5 Loss of System Water Pressure....................................5
1.6 Points for the boiler user................................................5
1.7 Troubleshooting.............................................................6
1.8 Normal Operation Display Codes..................................6
1.9 Fault Codes...................................................................7
THE BENCHMARK SERVICE INTERVALRECORD MUST BE COMPLETEDAFTER EACH SERVICE
All Gas Safe Register installers carry a Gas Safe Register ID card, and have a registration number. Both should be recorded in the
Benchmark Commissioning Checklist. You can check your installer by calling Gas Safe Register direct on 0800 4085500.
Ideal Heating is a member of the Benchmark scheme and fully supports the aims of the programme. Benchmark has been
introduced to improve the standards of installation and commissioning of central heating systems in the UK and to encourage the
regular servicing of all central heating systems to ensure safety and e󰀩ciency.
CONTENTS
WEEE DIRECTIVE 2012/19/EU
Waste Electrical and Electronic Equipment Directive
• At the end of the product life, dispose of the
packaging
and product in a corresponding recycle centre.
• Do not dispose of the unit with the usual domestic refuse.
• Do not burn the product.
• Remove the batteries.
• Dispose of the batteries according to the local statutory
requirements and not with the usual domestic refuse.

User Guide
3
USER
1.1 INTRODUCTION
The Logic System2S is a system boiler, featuring full sequence
automatic spark ignition and fan assisted combustion.
Due to the high e󰀩ciency of the boiler, condensate is produced
from the ue gases and this is drained to a suitable disposal
point through a plastic waste pipe at the base of the boiler.
A condensate ‘plume’ will also be visible at the ue terminal.
Safety
CURRENT GAS SAFETY (INSTALLATION & USE)
REGULATIONS OR RULES IN FORCE.
It is the law that this appliance installation and any work carried
out on the appliance is carried out by a Gas Safe Registered
engineer in accordance with the above Regulations.
It is essential that the instructions in this booklet are strictly
followed, for safe and economical operation of the boiler.
ELECTRICITY SUPPLY
This appliance must be earthed.
Supply: 230 V ~ 50 Hz. The fusing should be 3A.
IMPORTANT NOTES
• This appliance must not be operated without the casing
correctly tted and forming an adequate seal.
• If the boiler is installed in a compartment then the
compartment MUST NOT be used for storage purposes.
• If it is known or suspected that a fault exists on the boiler
then it MUST NOT BE USED until the fault has been
corrected by a Gas Safe Registered Engineer.
•Under NO circumstances should any of the sealed
components on this appliance be used incorrectly or
tampered with.
• This appliance can be used by children 8
years and above. Also persons with reduced
physical, sensory or mental capabilities, or lack
of experience and knowledge, provided 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 maintenance shall not be made by children
without supervision.
1.2 BOILER OPERATION
To START the boiler
1 Switch on electricity to the boiler and check that all external
controls e.g. programmer, room thermostat and cylinder
thermostat are all on.
2. If OFF is shown at the bottom of the screen press the Mode
button (B) so that ON appears.
3. Turn the Temperature control knob (A) until 80°C is shown.
Once the boiler has lit see the following page about where the
Temperature control knob should be set.
Note. In normal operation the boiler status display (C) will
display messages.
Refer to Section
1.7
Boiler frost protection – boiler will re if temperature is below
5°C.
During normal operation the burner symbol ‘ ’ will remain
illuminated when the burner is lit.
If the boiler fails to light after ve attempts the following fault
messages will be displayed:
L 02
To restart the boiler, press Restart (E). The boiler will repeat
the ignition sequence. If the boiler still fails to light consult a
Registered Gas Installer.
If an L code is shown on the display then the boiler can be restarted by pressing the Restart button (E).
Legend
A. Temperature Knob
B. Mode Button
C. Boiler Status Display
D. Burner On indicator
E. Restart Button
G. System Pressure Gauge
1
0
2
3
4
bar
C
A
B
D
N
E
G

4
User Guide
USER
OPERATION MODES
Winter/Summer Conditions – (Domestic Hot Water required,
Central Heating may be required)
If OFF is shown at the bottom of the screen then press the
Mode button (B) so that ON appears.
The boiler will re and supply heat to the hot water cylinder and
radiators.
Boiler O󰀨 – (neither Domestic Hot Water or Central Heating
required)
If ON is shown at the bottom of the screen then press the
Mode button (B) so that OFF appears.
CONTROL OF WATER TEMPERATURE
1. No Outside Sensor Connected
If no outside sensor is connected then the temperature of the
water leaving the boiler to go to either the radiators or the hot
water cylinder can set be anywhere between 80°C and 30°C
by rotating the Temperature Control Knob (A) clockwise or anti-
clockwise.
2. Outside Sensor Connected
If an outside sensor is connected then the temperature of the
water going to the hot water cylinder is factory set to 80°C
(but the temperature of the hot water to the tap is set by the
thermostat on the hot water cylinder).
The nominal central heating room temperature can be set
anywhere between 30°C and 10°C by rotating the Temperature
control knob (A) clockwise or anti-clockwise (if you are too cold
rotate the knob clockwise, if you would like to run your central
heating more e󰀩ciently rotate the knob anti-clockwise).
For economy setting refer to E󰀩cient Heating System
Operation.
EFFICIENT HEATING SYSTEM OPERATION
The boiler is a high e󰀩ciency, condensing appliance which will
automatically adjust its output to match the demand for heat.
Therefore gas consumption is reduced as the heat demand is
reduced.
The boiler condenses water from the ue gases when
operating most e󰀩ciently. To operate your boiler e󰀩ciently
(using less gas) turn the central heating temperature knob
(A) lower. In winter periods it may be necessary to turn the
knob towards a higher temperature position to meet heating
requirements. This will depend on the house and radiators
used.
Reducing the room thermostat setting by 1ºC can reduce gas
consumption by up to 10%.
BOILER FROST PROTECTION
The boiler is tted with frost protection that operates in all
modes, provided the power supply to the boiler is always
turned on. If the water in the boiler falls below 5ºC, the frost
protection will activate and run the boiler to avoid freezing.
The process does not guarantee that all other parts of the
system will be protected.
If a system frost thermostat has been installed, the boiler must
be set in winter mode, “(there should not be a cross through
the radiator symbol)”, for the system frost protection to run.
If no system frost protection is provided and frost is likely
during a short absence from home it is recommended to leave
the system heating controls or built in programmer (if tted)
switched on and run at a reduced temperature setting.
For longer periods, the entire system should be drained.
MAINS POWER OFF
To remove all power to the boiler the mains power switch must
be turned o󰀨.
1.3 CONDENSATE DRAIN
This appliance is tted with a siphonic condensate trap
system that reduces the risk of the appliance condensate
from freezing. However should the condensate pipe to this
appliance freeze, please follow these instructions:
a. If you do not feel competent to carry out the defrosting
instructions below please call your local Gas Safe
Registered installer for assistance.
b.
If you do feel competent to carry out the following instructions
please do so with care when handling hot utensils. Do not
attempt to thaw pipework above ground level.
If this appliance develops a blockage in its condensate pipe, its
condensate will build up to a point where it will make a gurgling
noise prior to locking out, showing an L0d or “LO2” fault code.
If the appliance is restarted it will make a gurgling noise prior to
locking out, showing an LO2 fault code.
To unblock a frozen condensate pipe;
1. Follow the routing of the plastic pipe from its exit point on
the appliance, through its route to its termination point.
Locate the frozen blockage. It is likely that the pipe is
frozen at the most exposed point external to the building
or where there is some obstruction to ow. This could be
at the open end of the pipe, at a bend or elbow, or where
there is a dip in the pipe in which condensate can collect.
The location of the blockage should be identied as closely
as possible before taking further action.
2. Apply a hot water bottle, microwaveable heat pack or a
warm damp cloth to the frozen blockage area. Several
applications may have to be made before it fully defrosts.
Warm water can also be poured onto the pipe from a
watering can or similar. DO NOT use boiling water.
3. Caution when using warm water as this may freeze and
cause other localised hazards.
4.
Once the blockage is removed and the condensate can ow
freely, restart the appliance. (Refer to “To Start the boiler”)
5. If the appliance fails to ignite, call your Gas Safe
Registered engineer.

User Guide
5
USER
1.5 LOSS OF SYSTEM WATER PRESSURE
The gauge (G) indicates the central heating system pressure.
If the pressure is seen to fall below the original installation
pressure of 1-2 bar over a period of time then a water leak
may be indicated. In this event conduct the re-pressurising
procedure as follows:
Re-pressurise via the lling loop to 1 bar (if unsure contact
your installer). Turn o󰀨 the tap on the lling loop and press the
“RESTART” button (E) to restart the boiler.
If unable to do so or if the pressure continues to drop after
lling a Gas Safe Registered Engineer should be consulted.
Note. The boiler will not operate if pressure has reduced to
less than 0.3 bar under this condition.
FORANY QUERIES PLEASE RING THE IDEAL
CONSUMER HELPLINE : 01482 498660
BOILER RESTART PROCEDURE - To restart boiler
press the restart button (E)
1.6 POINTS FOR THE BOILER USER
In line with our current warranty policy we would ask that you
check through the following guide to identify any problems
external to the boiler prior to requesting a service engineers
visit. Should the problem be found to be other than with the
appliance we reserve the right to levy a charge for the visit, or
for any pre-arranged visit where access is not gained by the
engineer.
Preventative solutions
During cold weather, set the central heating temperature knob
(A) to maximum (must return to original setting once cold spell
is over).
Place the heating on continuous and turn the room thermostat
down to 15ºC overnight or when unoccupied. (Return to normal
after cold spell).
1.4 GENERALINFORMATION
BOILER PUMP
The boiler pump will operate briey as a self-check once every
24 hours, regardless of system demand.
MINIMUM CLEARANCES
Clearance of 165mm above, 100mm below, 2.5mm at the sides
and 450mm at the front of the boiler casing must be allowed for
servicing.
Bottom Clearance
Bottom clearance after installation can be reduced to 5mm.
This must be obtained with an easily removable panel, to
enable the system pressure gauge to be visible and to provide
the 100mm clearance required for servicing.
ESCAPE OF GAS
Should a gas leak or fault be suspected contact the National
Gas Emergency Service without delay.
Telephone [phone].
Ensure that;
- All naked ames are extinguished
- Do not operate electrical switches
- Open all windows and doors
CLEANING
For normal cleaning simply dust with a dry cloth. To remove
stubborn marks and stains, wipe with a damp cloth and nish o󰀨
with a dry cloth. DO NOT use abrasive cleaning materials.
MAINTENANCE
The appliance should be serviced at least once a year by a
Gas Safe Registered Engineer.
SCAN
for video

6
User Guide
USER
YES
NO HOT WATER
Check the mains power is
switched on and that ON is
shown at the bottom of the
screen (if not press the Mode
button so that ON is shown)
Is water coming out of the hot
water tap when turned on?
NO CENTRAL HEATING
Check that the mains power is
turned on and that ON is shown
at the bottom of the screen (if not
press the Mode button so that
ON is shown)
Does the boiler operate and
provide central heating?
Check the time settings on the
programmer are as you require
and adjust if necessary
Check that the programmable
room stat or Timer and room stat
are calling for heat.
If the fault persists see boiler
“Display Functions” section. If
“Boiler o󰀨” is displayed then
contact Ideal Customer Services
Helpline if your appliance is
under warranty or a Gas Safe
Registered Engineer, if out of
warranty
YES
NO
1.7 TROUBLESHOOTING
Contact a Gas Safe Registered
Engineer Contact a Gas Safe Registered
Engineer
NO
1.8 NORMALOPERATION DISPLAY CODES
The user control has one display to inform the user about the
status of the boiler. The display shows the status of the ame.
If no ame is detected then ame symbol will not be visible.
When the ame is detected the ame symbol will be visible
permanently.
Below is a list with display function.
Boiler O󰀨 Mode
Press the Mode button to
enable CH.
N
Boiler On Mode, no Heat
Demand
N
Boiler is active for Central
Heating
N
Boiler is in Lockout for a
specic error. Display will
show a number after the
“L” to indicate which error is
detected
Boiler has a fault for a
specic error. Display will
show a number after the
“F” to indicate which error is
detected.
Boiler is active for boiler
frost protection: operates
if the ambient temperature
is below 5°C until it reaches
19°C.
N
FP
L 01
F 01
N
N
OFF
Check that the mains power is
turned on and that ON is shown
at the bottom of the screen (if not
press the mode button so that
ON is shown).
Contact a Gas Safe registered
engineer.
NO HOT WATER AND NO
CENTRAL HEATING

7User Guide
USER
1.9 FAULT CODES
5 Boiler Resets in 15 minutes 1. Turn electrical supply to boiler o󰀨 and on.
2. If the boiler fails to operate please contact Ideal (if under warranty) or alternatively a
Gas Safe Registered Engineer if outside of the warranty period.
False Flame Lockout Restart the appliance - if the boiler fails to operate then please contact Ideal (if under
warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty
period.
DISPLAY CODE ON BOILER DESCRIPTION
Low Water Pressure
ACTION
Check system water pressure is between 1 & 1.5bar on the system pressure gauge. To
re-pressurise the system see Section 3. If the boiler still fails to operate then please contact
Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the
warranty period.
Check system water pressure is between 1 & 1.5 bar on the system pressure
gauge.
To re-pressurise the system see Section 3. If the boiler fails to operate then please contact
Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the
warranty period.
Flow Temperature Overheat
or No Water Flow
Blocked Flue/Condensate
Flame Loss
Ignition Lockout
1. Check other gas appliances in the house are working to conrm a supply is present in the property.
2. If other appliances do not work or there are no other appliances, check the gas supply is on at the
meter and/or pre payment meter has credit. If the boiler fails to operate then please contact Ideal (if
under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period.
1. Check condensate Pipe for blockages
2. Check other gas appliances in the house are working to conrm a
supply is present in the property.
3. If other appliances do not work or there are no other appliances, check the gas supply is on at the
meter and/or pre payment meter has credit. If the boiler fails to operate then please contact Ideal (if
under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period.
Fan Fault Restart the appliance - if the boiler fails to operate then please contact Ideal (if under
warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty
period.
Flow Thermistor Restart the appliance - if the boiler fails to operate then please contact Ideal (if under
warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty
period.
Return Thermistor Restart the appliance - if the boiler fails to operate then please contact Ideal (if under
warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty
period.
Outside Sensor Failure Restart the appliance - if the boiler fails to operate then please contact Ideal (if under
warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty
period.
Low Mains Voltage Contact a qualied electrician or your electricity provider.
Uncongured PCB Uncongured/faulty PCB or gas valve short circuit. Please contact Ideal (if under
warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty
period.
F 01
F 05
F 09
L 01
L 02
L06
L0C
F0U
L 05
L 09
F 02
F 03
F 06
F 07
F 04 L 04
Refer to Section
1.6
Flow/Return Di󰀨erential >
50°C If the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a
Gas Safe Registered Engineer if outside of the warranty period.
L0 1. Check condensate Pipe for blockages
2. Check other gas appliances in the house are working to conrm a supply is present in
the property.
3. If other appliances do not work or there are no other appliances, check the gas supply is on at the
meter and/or pre payment meter has credit. If the boiler fails to operate then please contact Ideal (if
under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period.

Technical Training
Our Expert Academy offer a range of training options designed and delivered by our experts in heating.
For details please visit: expert-academy.co.uk
Ideal is a trademark of Ideal Boilers.
Registered Office
Ideal Boilers Ltd., National Avenue, Hull, East Yorkshire, HU5 4JB
Tel [phone] Fax [phone]
Registration No. London 322 137
EU Authorised Representative:
Atlantic SFDT
44 Boulevard des Etats-Unis, 85 000 La Roche-Sur-Yon, France
[phone]
Ideal Technical Helpline: 01482 498663
Ideal Consumer Helpline: 01482 498660
Ideal Parts: 01482 498665
idealheating.com
Ideal Boilers Ltd., pursues a policy of continuing improvement in the design and performance of its products.
The right is therefore reserved to vary specification without notice.
At Ideal Heating we take our environmental impact seriously, therefore when installing any Ideal Heating product please make sure to dispose of any
previous appliance in an environmentally conscious manner. Households can contact their local authority to find out how.
See https://www.gov.uk/managing-your-waste-an-overview for guidance on how to efficiently recycle your business waste.