Ideal Heating LOGIC COMBI2 C24 User manual

3User Guide
Ideal Technical Helpline: 01482 498663
Ideal Consumer Helpline: 01482 498660
Ideal Parts: 01482 498665
idealheating.com
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
LOGIC COMBI2
C24 C30 C35
October 2022
UIN 228296 A06

2
User Guide
USER
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.
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.

3User Guide
USER
1.1 Introduction ....................................................................3
1.2 Boiler Operation...........................................................4-5
1.3 System Water Pressure..................................................6
1.4 Points for the boiler user.................................................6
1.5 Condensate Drain (Unblocking) .....................................7
1.6 General Information........................................................7
1.7 Troubleshooting..............................................................8
1.8 Normal Operation Display Codes...................................8
1.9 Fault Codes....................................................................9
1.1 INTRODUCTION
The Logic Combi2is a combination boiler providing both
central heating and instantaneous domestic hot water.
Featuring full sequence automatic 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.
CONTENTS

User Guide
4
USER
1.2 BOILER OPERATION
To START the boiler
If a programmer is tted refer to separate instructions for the
programmer before continuing.
Start the boiler as follows:
1. Ensure that all hot water taps are turned o󰀨.
2. Check that the electricity supply to boiler is on.
3. Press the mode button until a cross is not shown through
the radiator symbol.
4. Turn the Domestic Hot water temperature knob (A)
clockwise until a 65°C target temperature is shown. Turn
the Central Heating temperature knob (B) clockwise until
an 80°C target temperature is shown.
The boiler will commence ignition sequence, supplying heat to
the central heating, if required.
Note. In normal operation the boiler status display (D) will
show codes:
Legend
A. Domestic Hot Water
Temperature Knob
B. Central Heating
Temperature Knob
C. Mode Button
D. Boiler Status Display
E. Burner On indicator
F. Restart Button
G. Pressure Gauge
1
0
2
3
4
bar
A
D
B
C
E
GF
Boiler O󰀨 Mode
Press the Mode button once to
enable DHW or twice to enable
CH.
CH O󰀨
Press the Mode button until the
cross disappears to enable CH.
Winter Mode, no heat demand
Boiler is active for Central
Heating
Boiler is active for Domestic
Hot Water
Boiler is heating up the
Plate Heat Exchanger
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.
PH
PREHEAT ON
FP
L 01
F 01
During normal operation the burner on indicator ‘ ’ will
remain illuminated when the burner is lit.
Note: If the boiler fails to light after ve attempts the fault
code will be displayed (refer to Fault Code page).

5User Guide
USER
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
(B) 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%.
WEATHER COMPENSATION
When the Weather Compensation option is tted to the system
then the central heating temperature knob (B) 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
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.
BOILER RESTART
To restart the boiler, when directed in the listed fault codes (see
section 1.9) 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.
MAINS POWER OFF
To remove all power to the boiler the mains power switch must
be turned o󰀨.
OPERATION MODES
WINTER CONDITIONS - (CENTRAL HEATING AND
DOMESTIC HOT WATER REQUIRED)
Press the mode button until there is not a cross through the
radiator symbol.
The boiler will re and supply heat to the radiators but will give
priority to domestic hot water on demand.
The domestic hot water preheat will operate if the preheat has
been enabled. If Preheat On is shown at the bottom left of the
display then preheat is enabled, if Preheat O󰀨 is shown then it
is disabled.
Summer Conditions - (Domestic Hot Water only required)
Press the mode button until a cross is shown through the
radiator, but a cross is not shown through the tap.
Set the central heating demand on the external controls to
OFF.
The domestic hot water preheat will operate if the preheat has
been enabled. If Preheat On is shown at the bottom left of the
display then preheat is enabled, if Preheat O󰀨 is shown then it
is disabled.
BOILER OFF
Press the mode button until crosses are shown through both
the tap and radiator symbols.
PREHEAT - DOMESTIC HOT WATER
The domestic hot water heat exchanger within the boiler can
be preheated to provide faster delivery of hot water at the tap.
The boiler is factory set with the preheat turned o󰀨 to give
standard hot water delivery and reduce gas usage.
If required, the preheat can be switched on during installation
for faster domestic hot water delivery. With preheat turned
on, ‘Timed’ is shown on the display as this boiler has a timed
intelligent preheat function which learns the usage patten for
domestic hot water over 24 hours.
It then res the boiler periodically for a few seconds to maintain
the temperature of the domestic hot water heat in the boiler, as
required to meet the predicted hot water draw-o󰀨.
This improves the speed of response for DHW whilst
minimising the use of gas.
CONTROL OF WATER TEMPERATURE
DOMESTIC HOT WATER
The domestic hot water temperature is limited by the boiler
controls to a maximum temperature of 65ºC, adjustable via the
domestic hot water temperature knob (A).
Approximate temperatures for domestic hot water:
Knob Setting Hot Water Temperature (approx.)
Minimum 40ºC
Maximum 65ºC
Due to system variations and seasonal temperature
uctuations domestic hot water ow rates/temperature rise will
vary, requiring adjustment at the tap : the lower the ow rate
the higher the temperature, and vice versa.
CENTRAL HEATING
The boiler controls the central heating radiator temperature
to a maximum of 80
o
C, adjustable via the central heating
temperature knob (B).
Approximate temperatures for central heating:
Knob Setting Central Heating Radiator
Temperature (approx.)
Minimum 30ºC
Maximum 80ºC
Set to 72°C or less for high e󰀩ciency operation.

User Guide
6
USER
1.3 SYSTEM WATER PRESSURE
The system pressure gauge (see page 4) 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 and continue to fall then a water leak may be indicated. In this event re-pressurise the
system as shown below. If unable to do so or if the pressure continues to drop a Gas Safe
Registered Engineer should be contacted.
THE BOILER WILL NOT OPERATE IF THE PRESSURE HAS REDUCED TO LESS
THAN 0.3 BAR UNDER THIS CONDITION.
To Top up the system :-
1. Ensure both & handles (blue & green) are in closed
position (as shown below)
2. Remove the plug and cap and retain.
3. Connect the lling loop to the Domestic Hot Water (DHW) inlet
and tighten. Also ensure that the other end of lling loop is
hand tight.
4. Turn the Domestic Hot Water (DHW) Inlet blue handle
to the horizontal position.
5. Ensuring no leaks are seen, gradually turn the lling loop
handle (green) to the horizontal position.
6. Wait for the pressure gauge to reach 1 to 1.5 bar.
7. Once pressure is reached turn valves & back to the
closed position.
8. Disconnect the lling loop, replace cap and plug.
Note. There can be some water spillage at this point.
1.4 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.
FORANY QUERIES PLEASE RING THE IDEAL CONSUMER HELPLINE : 01482 498660
BOILER RESTART PROCEDURE - To restart boiler press the restart button
Filling Positions shown Top Up Positions shown
B
B
B
1
0
2
3
4
bar
Min
Max
1 bar
2 bar
SCAN
for video
Filling Loop
Handle
(Green)
CH Return
DHW Inlet
Valve
Cap
Cap
Plug
Plug
Filling
Loop Filling Loop
A
B
B
A
C
(Blue)
(Black)
Filling Loop
Handle
(Green)
DHW Inlet
Valve
(Blue)
CH Return
(Black)
C

7User Guide
USER
1.5 UNBLOCKING THE CONDENSATE DRAIN 1.6 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 165 mm above, 100 mm below, 2.5 mm at the
sides and 450 mm at the front of the boiler casing must be
allowed for servicing.
Bottom Clearance
Bottom clearance after installation can be reduced to 5 mm.
This must be obtained with an easily removable panel, to
enable the system pressure gauge to be visible and to provide
the 100 mm clearance required for servicing.
EXPANSION
Note. If a water meter is tted into the incoming water
mains there may be a requirement for a domestic hot water
expansion vessel Kit. Contact a Gas Safe Registered
Engineer.
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 frequency of servicing will depend upon the installation
condition and usage but should be carried out at least
annually by a Gas Safe Registered Engineer.
SCAN
for video
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 a “L02” 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.
Preventative solutions
During cold weather, set the central heating temperature knob
(B) 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).

User Guide
8
USER
YES
NO HOT WATER
Check the mains power is
switched on and that there is
no a cross through the radiator
symbol (in which case press the
mode button until no cross 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 there is not
a cross through the radiator
symbol. If there is a cross
through the radiator symbol
press mode until it disappears.
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.
NO HOT WATER OR CENTRAL
HEATING
Check that the mains power is
turned on and that there is not a
cross through the tap symbol. If
there is a cross through the tap
symbol press the mode button
until no crosses are shown.
See boiler “Display Functions”
section
Does the boiler have a display
showing on the front control
panel?
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
Contact a Gas Safe Registered
Engineer
1.7 TROUBLESHOOTING
Contact a Gas Safe Registered
Engineer Contact a Gas Safe Registered
Engineer
NO YES
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 once to
enable DHW or twice to enable
CH.
CH O󰀨
Press the Mode button until the
cross disappears to enable CH.
Winter Mode, no heat demand
Boiler is active for Central
Heating
Boiler is active for Domestic
Hot Water
Boiler is heating up the
Plate Heat Exchanger
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.
PH
PREHEAT ON
FP
L 01
F 01

User Guide
9
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
Rotate all knobs fully clockwise, turn boiler power o󰀨 and on then press restart.
Diverter Valve in mid-position
for service
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
1.5
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.
F 0C DHW Thermistor Fault 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.
U

Technical Training
Our Expert Academy offer a range of training options designed and delivered by our experts in heating.
For details please contact: 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.