Ideal Boilers LOGIC SYSTEM 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 Boilers.
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February 2020
UIN 215349 A09
USER GUIDE
LOGIC SYSTEM
S15 S18 S24 S30

2
User’s
THE BENCHMARK SERVICE INTERVAL RECORD MUST BE COMPLETED AFTER EACH SERVICE
Ideal Boilers 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 efciency.
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.
1. INTRODUCTION
The Logic System S is a system boiler, featuring full sequence
automatic spark ignition and fan assisted combustion. It is
designed to provide central heating and hot water when a separate
hot water cylinder is installed.
Due to the high ef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.
In your own interest, and that of safety, it is the law that this
boiler must be installed by a Gas Safe Registered Engineer, in
accordance with the above regulations.
In IE, the installation must be carried out by a Registered Gas Installer
(RGII) and installed in accordance with the current edition of I.S. 813
“Domestic Gas Installations”, the current Building Regulations and
reference should be made to the current ETCI rules for electrical
installation.
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 or in IE a Registered Gas
Installer (RGII).
•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.
CONTENTS
1. Introduction .............................................................. 2
Safety ......................................................................... 2
Electricity Supply........................................................ 2
Important Notes.......................................................... 2
2. Boiler Operation ....................................................... 3
Controls Diagram........................................................ 3
To Start the Boiler....................................................... 3
Control of Water Temperature .................................... 3
Efcient Heating System Operation............................ 3
Weather Compensation.............................................. 3
Boiler Frost Protection................................................ 3
Boiler Restart.............................................................. 3
Mains Power Off......................................................... 3
3. Condensate Drain..................................................... 4
4. Loss of System Water Pressure.............................. 4
5. General Information ................................................. 4
Boiler Pump................................................................ 4
Minimum Clearances.................................................. 4
Escape of Gas............................................................ 4
Cleaning ..................................................................... 4
Maintenance............................................................... 4
6. Points for the Boiler User ........................................ 5
Troubleshooting.......................................................... 5
7. Normal Operation Display Codes ........................... 6
8. Fault Codes............................................................... 7

3
User’s
TO START THE BOILER
If a programmer is tted refer to separate instructions for the
programmer before continuing.
Start the boiler as follows:
1.
Check that the electricity supply to boiler is off.
2. Set the mode knob (B) to ‘BOILER OFF’.
3. Set the Central Heating temperature knob (A) to ‘MAX’.
4.
Switch on electricity to the boiler and check that all external
controls, e.g. programmer, room thermostat and hot water
cylinder thermostat are on.
5. Set the mode knob (B) to ‘BOILER ON’.
The boiler will commence ignition sequence, supplying heat to the
central heating, if required.
Note. In normal operation the boiler status display (C) will show codes:
00 Standby - no demand for heat.
Central Heating being supplied
FP Boiler frost protection
- boiler will re if temperature is below 5ºC.
During normal operation the burner on indicator (D) will remain
illuminated when the burner is lit.
Note: If the boiler fails to light after ve attempts the fault code L 2
will be displayed (refer to Fault Code page).
To Turn Off
Set the mode knob (B) to ‘BOILER OFF’.
CONTROL OF WATER TEMPERATURE
The boiler controls the central heating radiator temperature to a
maximum of 80
o
C, adjustable via the central heating temperature
knob (A).
Approximate temperatures for central heating:
Knob Setting Central Heating Radiator Temperature (approx.)
Minimum 30ºC
Maximum 80ºC
For economy setting ‘ ’ refer to Efcient Heating System
Operation.
2. BOILER OPERATION
EFFICIENT HEATING SYSTEM OPERATION
The boiler is a high ef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 efciently. To operate your boiler efciently
(using less gas) turn the central heating temperature knob
(A) to the ‘ ‘ position or lower. In winter periods it may be
necessary to turn the knob towards the ‘MAX’ 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%.
WEATHER COMPENSATION
When the Weather Compensation option is tted to the system
then the central heating temperature knob (A) becomes
a method of controlling room temperature. Turn the knob
clockwise to increase room temperature and anti-clockwise
to decrease room temperature. Once the desired setting has
been achieved, leave the knob in this position and the system
will automatically achieve the desired room temperature for all
outside weather conditions.
BOILER FROST PROTECTION
If the system includes a frost thermostat then, during cold
weather, the boiler should be turned OFF at the programmer
(if tted) ONLY. The mains supply should be left switched ON,
with the boiler thermostat left in the normal running position.
If no system frost protection is provided and frost is likely
during a short absence from home it is recommended to leave
the heating controls (if tted) at a reduced temperature setting.
For longer periods, the entire system should be drained.
BOILER RESTART
To restart the boiler, when directed in the listed fault codes
(see section 8) press the “RESTART” button (F). The boiler
will repeat its ignition sequence. If the boiler still fails to start
consult a Gas Safe Registered Engineer or an IE Registered
Gas Installer (RGII).
MAINS POWER OFF
To remove all power to the boiler the mains power switch must
be turned off.
Legend
A. CH temperature control
B. Mode Control Knob
C. Boiler Status
D. Burner ‘on’ indicator
E. Function Button
F. Restart Button
G. Pressure Gauge
H. Central Heating
Economy Setting
ºC
ON
A BE C D
MIN
e
RESTART
MAX
BOILER
OFF
BOILER
ON
G B C DE F A H

4
User’s
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 an “L 2” fault code. If the appliance is
restarted it will make a gurgling noise prior to it locking out on a
failed ignition “L 2” 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.
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).
4. 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 off the tap on the lling loop and press the
“RESTART” button to restart the boiler.
If unable to do so or if the pressure continues to drop after lling
a Gas Safe Registered Engineer or in IE a Registered Gas
Installer (RGII) should be consulted.
NOTE. THE BOILER WILL NOT OPERATE IF PRESSURE
HAS REDUCED TO LESS THAN 0.3 BAR UNDER THIS
CONDITION.
5. GENERAL INFORMATION
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 (6
1
/2”) above, 100mm (4”) below, 2.5mm (
1
/8”)
at the sides and 450mm (17 3/4”) 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 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 off 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 or in IE a Registered Gas Installer
(RGII).

5
User’s
YES
NO CENTRAL HEATING
Check the mains power is turned on
and ensure mode control knob (B) is
in the ON position
Does the boiler operate and provide
central heating?
Check the time settings on the
programmer are as you require and
adjust if necessary
Check the programmer (external to
the boiler) is in an “ON” position and
the room thermostat is turned up
NO
See boiler “Operation Modes” and
“Fault Codes” section. If “0 0” is
displayed then contact a Gas Safe
Registered Engineer or in IE a
Registered Gas Installer (RGII)
YES
NO HOT WATER
Check the mains power is turned on
and ensure mode control knob (B) is in
the ON position
Does the boiler operate and provide
hot water?
Check the time settings on the
programmer are as you require and
adjust if necessary
Check the programmer (external to the
boiler) is in an “ON” position and the hot
water cylinder thermostat is turned up
NO
See boiler “Operation Modes” and
“Fault Codes” section. If “0 0” is
displayed then contact a Gas Safe
Registered Engineer or in IE a
Registered Gas Installer (RGII)
6. POINTS FOR THE BOILER USER
Note. 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.
TROUBLESHOOTING
FOR ANY QUERIES PLEASE RING THE
IDEAL CONSUMER HELPLINE : 01482 498660
NOTE. BOILER RESTART PROCEDURE -
To restart boiler, press the “RESTART” button.

6
User’s
DISPLAY CODE ON BOILER DESCRIPTION
The boiler is in standby operation awaiting either a central heating call or hot water demand.
The boiler has a call for central heating but the appliance has reached the desired
temperature set on the boiler.
The boiler is operating in central heating / hot water mode.
The boiler is operating in frost protection.
7. NORMAL OPERATION DISPLAY CODES
The boiler mode knob (B) is in the off position, rotate fully clockwise for hot water and central
heating operation.
FP
- -
54
00
54
oC
oC
ON
ON

7
User’s
5 Boiler Resets in 15 minutes 1. Turn electrical supply to boiler off 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. In IE contact a
Registered Gas Installer (RGII).
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. In IE contact a Registered Gas Installer (RGII).
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. In IE contact a Registered Gas Installer (RGII).
Check system water pressure is between 1 & 1.5bar on the system pressure
gauge.
To re-pressurise the system see Section 4. 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. In IE contact a Registered Gas Installer (RGII).
8. FAULT CODES
Flow Temperature Overheat
or No Water Flow
Flow/Return Differential >
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. In IE contact a
Registered Gas Installer (RGII).
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. In IE contact a Registered Gas Installer (RGII).
1. Check condensate Pipe for blockages (refer to Section 3)
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. In IE contact a Registered Gas Installer (RGII).
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. In IE contact a Registered Gas Installer (RGII).
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. In IE contact a Registered Gas Installer (RGII).
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. In IE contact a Registered Gas Installer (RGII).
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. In IE contact a Registered Gas Installer (RGII).
Low Mains Voltage Contact a qualied electrician or your electricity provider.
Uncongured PCB Uncongured PCB. Please contact Ideal (if under warranty) or alternatively a Gas Safe
Registered Engineer if outside of the warranty period. In IE contact a Registered Gas
Installer (RGII).
F 1
F 5
F 9
L 1
L 2
L 6
L C
F U
L 5
L 9
F 2
F 3
F 6
F 7
F 4 L 4