USER GUIDE

LOGIC COMBI C
24 30 35

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.
For the very latest copy of literature for specification and maintenance practices visit our website www.idealboilers.com
where you can download the relevant information in PDF format.
For alternative languages in our User Guides please visit our website www.idealboilers.com.

February 2018
UIN 213972 A06
 1. INTRODUCTION
CONTENTS The Logic Combi C range is a combination boiler providing both
central heating and instantaneous domestic hot water. Featuring
1. Introduction ............................................................... 2 full sequence automatic ignition and fan assisted combustion.

Safety.......................................................................... 2 Due to the high efficiency of the boiler, condensate is produced from
the flue gases and this is drained to a suitable disposal point through
Electricity Supply......................................................... 2 a plastic waste pipe at the base of the boiler. A condensate ‘plume’
Important Notes........................................................... 2 will also be visible at the flue terminal.
2. Boiler Operation........................................................ 3
Controls Diagram........................................................ 3 SAFETY
To Start the Boiler........................................................ 3 Current Gas Safety (Installation & Use) Regulations or
Operation Modes......................................................... 3 rules in force.
Preheat Domestic Hot Water....................................... 3 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
Control of Water Temperature..................................... 3 accordance with the above regulations.
Efficient Heating System Operation............................ 4 In IE, the installation must be carried out by a Registered Gas Installer
Weather Compensation............................................... 4 (RGII) and installed in accordance with the current edition of I.S. 813
“Domestic Gas Installations”, the current Building Regulations and
Boiler Frost Protection................................................. 4 reference should be made to the current ETCI rules for electrical
Boiler Restart............................................................... 4 installation.

Mains Power Off.......................................................... 4 It is essential that the instructions in this booklet are strictly
followed, for safe and economical operation of the boiler.
3. System Water Pressure............................................ 4
ELECTRICITY SUPPLY
4. Condensate Drain...................................................... 5
This appliance must be earthed.
5. General Information.................................................. 5 Supply: 230 V ~ 50 Hz. The fusing should be 3A.
Boiler Pump................................................................. 5
Minimum Clearances................................................... 5
Expansion.................................................................... 5 IMPORTANT NOTES
Escape of Gas............................................................. 5 • This appliance must not be operated without the casing
correctly fitted and forming an adequate seal.
Cleaning...................................................................... 5
• If the boiler is installed in a compartment then the compartment
Maintenance................................................................ 5
MUST NOT be used for storage purposes.
6. Points for the Boiler User......................................... 6
• If it is known or suspected that a fault exists on the boiler then
Troubleshooting........................................................... 6 it MUST NOT BE USED until the fault has been corrected by
7. Normal Operation Display Codes............................ 7 a Gas Safe Registered Engineer or in IE a Registered Gas
Installer (RGII).
8. Fault Codes................................................................ 8
• 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.

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 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 efficiency.
THE BENCHMARK SERVICE INTERVAL RECORD MUST BE COMPLETED AFTER EACH SERVICE

2 User’s
2. BOILER OPERATION

Legend
A. Domestic Hot Water Temperature Knob
B. Central Heating Temperature Knob BOILER

C. Mode Knob e
OFF

ºC
D. Boiler Status Display
E. Burner ‘on’ Indicator HOT WATER
PREHEAT
ON
F. Preheat On Off button MIN MAX MIN MAX

G. Restart button PREHEAT RESTART

MODE

H. Central Heating Economy Setting

J. Pressure Gauge

J A D F G E B H C

TO START THE BOILER PREHEAT - DOMESTIC HOT WATER

If a programmer is fitted refer to separate instructions for the The domestic hot water heat exchanger within the boiler can be
programmer before continuing. kept preheated to provide faster delivery of hot water at the tap.
Start the boiler as follows: This is achieved by pressing the ‘PREHEAT’ button (F) so that
‘HOT WATER PREHEAT ON’ is shown on the display.
1. Check that the electricity supply to boiler is off.
The boiler will operate periodically for a few seconds to maintain
2. Set the mode knob (C) to ‘BOILER OFF’.
the domestic hot water heat exchanger in a preheated condition.
3. Set the Domestic Hot Water temperature knob (A) and Central The avera ge time period between operation is 90 minutes. This
Heating temperature knob (B) to ‘MAX’. may vary considerably due to the surrounding ambient temperature
4. Ensure that all hot water taps are turned off. of the boiler. The boiler will operate whenever there is a demand
5. Switch on electricity to the boiler and check that all external for domestic hot water.
controls, e.g. programmer and room thermostat, are on. If standard hot water delivery is satisfactory press the ‘PREHEAT’
button (F) so that ‘HOT WATER PREHEAT OFF’ is shown on the
6. Set the mode knob (C) to ‘ ’ (winter).
display.
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: CONTROL OF WATER TEMPERATURE
00 Standby - no demand for heat. Domestic Hot Water
Central Heating being supplied The domestic hot water temperature is limited by the boiler
controls to a maximum temperature of 65ºC, adjustable via the
Domestic hot water being supplied domestic hot water temperature knob (A).
PH Domestic hot water preheat
Approximate temperatures for domestic hot water:
FP Boiler frost protection
- boiler will fire if temperature is below 5ºC. Knob Setting Hot Water Temperature (approx.)
Minimum 40ºC
During normal operation the burner on indicator ‘ ’ will remain
illuminated when the burner is lit. Maximum 65ºC

Note: If the boiler fails to light after five attempts the fault code Due to system variations and seasonal temperature fluctuations
will be displayed (refer to Fault Code page). domestic hot water flow rates/temperature rise will vary, requiring
adjustment at the tap : the lower the flow rate the higher the
temperature, and vice versa.

OPERATION MODES Central Heating

Winter Conditions - (Central Heating and Domestic Hot Water required) The boiler controls the central heating radiator temperature to a
maximum of 80oC, adjustable via the central heating temperature
Set the mode knob (C) ‘ ’ (winter). knob (B).
The boiler will fire and supply heat to the radiators but will give Approximate temperatures for central heating:
priority to domestic hot water on demand.
The domestic hot water preheat will operate with the ‘PREHEAT’ Knob Setting Central Heating Radiator Temperature (approx.)
button pressed so that the display shows “HOT WATER Minimum 30ºC
PREHEAT ON”.
Maximum 80ºC
Summer Conditions - (Domestic Hot Water only required)
Set the mode knob (C) to ‘ ’ (summer). For economy setting ‘ ’ refer to Efficient Heating System
Set the central heating demand on the external controls to OFF. Operation.
The domestic hot water preheat will operate with the ‘PREHEAT’
button pressed so that the display shows “HOT WATER
PREHEAT ON”.
Boiler Off
Set the mode knob (C) to ‘BOILER OFF’. The boiler mains
power supply must be left on to enable frost protection (see Frost
Protection).
continued..........
User’s 3

‘ ’
EFFICIENT HEATING SYSTEM OPERATION 3. SYSTEM WATER PRESSURE
The boiler is a high efficiency, condensing appliance which will The system pressure gauge indicates the
automatically adjust its output to match the demand for heat. central heating system pressure. If the pressure
Therefore gas consumption is reduced as the heat demand is is seen to fall below the original installation
reduced. pressure of 1-2 bar over a period of time and
The boiler condenses water from the flue gases when continue to fall then a water leak may be
operating most efficiently. To operate your boiler efficiently indicated. In this event re-pressurise the system
(using less gas) turn the central heating temperature knob as shown below. If unable to do so or if the
(B) to the ‘ ‘ position or lower. In winter periods it may be pressure continues to drop a Gas Safe Registered Engineer or in IE
necessary to turn the knob towards the ‘MAX’ position to meet a Registered Gas Installer (RGII) should be consulted.
heating requirements. This will depend on the house and THE BOILER WILL NOT OPERATE IF THE PRESSURE HAS
radiators used. REDUCED TO LESS THAN 0.3 BAR UNDER THIS CONDITION.
Reducing the room thermostat setting by 1ºC can reduce gas To Top up the system :-
consumption by up to 10%.
1. Ensure both A & B handles (blue) are in closed position (as
shown below)
WEATHER COMPENSATION 2. Remove the plug and cap and retain.
When the Weather Compensation option is fitted to the system 3. Connect the filling loop to the Domestic Hot Water (DHW) inlet and
then the central heating temperature knob (B) becomes tighten. Also ensure that the other end of filling loop is hand tight.
a method of controlling room temperature. Turn the knob
clockwise to increase room temperature and anti-clockwise Starting Position Domestic Hot Water
to decrease room temperature. Once the desired setting has (DHW) Inlet Valve
been achieved, leave the knob in this position and the system
will automatically achieve the desired room temperature for all
outside weather conditions.
Filling A
Loop
BOILER FROST PROTECTION
The boiler is fitted with frost protection that operates in all Cap Plug
modes, provided the power supply to the boiler is always B
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.
Filling Loop
If a system frost thermostat has been installed, the boiler must
Handle (Blue)
be set in winter mode, ‘ ’, for the system frost protection to
run.
If no system frost protection is provided and frost is likely
Filling Position
during a short absence from home it is recommended to leave
the system heating controls or built in programmer (if fitted) Cap
switched on and run at a reduced temperature setting. For Plug
longer periods, the entire system should be drained.
Filling
Loop
BOILER RESTART
To restart the boiler, when directed in the listed fault codes (see A
section 8) press the restart button (G). 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 B
(RGII).

MAINS POWER OFF

To remove all power to the boiler the mains power switch must
be turned off.

4. Turn the Domestic Hot Water (DHW) Inlet A blue handle to

the horizontal position.
5. Ensuring no leaks are seen, gradually turn the filling loop
handle (blue) B to the horizontal position.
6. Wait for the pressure gauge to reach 1 to 1.5 bar.
7. Once pressure is reached turn valves A & B back to the
closed position.
8. Disconnect the filling loop, replace cap and plug. Note there
can be some water spillage at this point.

4 User’s
4. CONDENSATE DRAIN 5. GENERAL INFORMATION
This appliance is fitted with a siphonic condensate trap system BOILER PUMP
that reduces the risk of the appliance condensate from freezing. The boiler pump will operate briefly as a self-check once every 24
However should the condensate pipe to this appliance freeze, hours, regardless of system demand.
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. MINIMUM CLEARANCES
b. If you do feel competent to carry out the following instructions Clearance of 165mm above, 100mm below, 2.5mm at the sides
please do so with care when handling hot utensils. Do not attempt and 450mm at the front of the boiler casing must be allowed for
to thaw pipework above ground level. servicing.
If this appliance develops a blockage in its condensate pipe, its Bottom Clearance
condensate will build up to a point where it will make a gurgling Bottom clearance after installation can be reduced to 5mm.
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 This must be obtained with an easily removable panel, to enable
failed ignition “L 2” code. the system pressure gauge to be visible and to provide the 100mm
clearance required for servicing.
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 EXPANSION
the most exposed point external to the building or where there NOTE. If a water meter is fitted into the incoming water mains
is some obstruction to flow. This could be at the open end of there may be a requirement for a domestic hot water expansion
the pipe, at a bend or elbow, or where there is a dip in the pipe vessel Kit. Contact a Gas Safe Registered Engineer or in IE a
in which condensate can collect. The location of the blockage Registered Gas Installer (RGII).
should be identified 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 ESCAPE OF GAS
may have to be made before it fully defrosts. Warm water can Should a gas leak or fault be suspected contact the National Gas
also be poured onto the pipe from a watering can or similar. Emergency Service without delay. Telephone 0800 111 999.
DO NOT use boiling water.
Ensure that;
3. Caution when using warm water as this may freeze and cause - All naked flames are extinguished
other localised hazards. - Do not operate electrical switches
4. Once the blockage is removed and the condensate can flow freely, - Open all windows and doors
restart the appliance. (Refer to “To Start the boiler”)
5. If the appliance fails to ignite, call your Gas Safe Registered
engineer.
CLEANING
Preventative solutions
For normal cleaning simply dust with a dry cloth. To remove stubborn
During cold weather, set the central heating temperature knob
marks and stains, wipe with a damp cloth and finish off with a dry
(B) to maximum (must return to original setting once cold spell is
cloth. DO NOT use abrasive cleaning materials.
over).
Place the heating on continuous and turn the room thermostat
down to 15ºC overnight or when unoccupied. (Return to normal
after cold spell). 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).

User’s 5
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 engineer’s 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

NO HOT WATER NO CENTRAL HEATING NO HOT WATER OR

CENTRAL HEATING

Check the mains power is turned Check the mains power is turned
on and ensure mode knob (C) is on and ensure mode knob (C) is Check the mains power is turned
in the summer or winter position in the winter position on and ensure mode knob (C) is
in the winter position

Is water coming out of the hot NO Check the programmer (internal

water tap when turned on? or external to the boiler) is in Does the boiler have a display
an “ON” position and the room showing on the front control NO
YES thermostat is turned up panel?

See boiler “Fault Codes” YES

section. If ‘00’ is displayed then
contact Ideal Customer Services Does the boiler operate and NO See boiler “Operation Modes”
Helpline if your appliance is provide central heating? and “Fault Codes” section
under warranty or a Gas Safe
Registered Engineer, in IE a YES
Registered Gas Installer (RGII),
Check the time settings on the Contact a Gas Safe Registered
if out of warranty
programmer are as you require Engineer or in IE a Registered
and adjust if necessary Gas Installer (RGII)

Contact a Gas Safe Registered See boiler “Operation Modes”

Engineer or in IE a Registered and “Fault Codes” section.
Gas Installer (RGII) If ‘00’ is displayed then contact a
Gas Safe Registered Engineer
or in IE a Registered Gas
Installer (RGII)

6 User’s
 7. NORMAL OPERATION DISPLAY CODES

DISPLAY CODE ON BOILER DESCRIPTION

00 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
54 o
C temperature set on the boiler.

The boiler has a call for hot water but the appliance has reached the desired temperature set on
54 o
C the boiler.

The boiler is operating in central heating mode.

54 o
C

The boiler is operating in domestic hot water mode.

54 o
C

The boiler is operating in domestic hot water preheat mode.

HOT WATER
PREHEAT
ON
PH o
C

The boiler is operating in frost protection.

FP
The boiler mode knob (C) is in the off position, rotate fully clockwise for hot water and central

-- heating operation.

FOR ANY QUERIES PLEASE RING THE

IDEAL CONSUMER HELPLINE : 01482 498660
NOTE. BOILER RESTART PROCEDURE -
To restart the boiler press the RESTART button. The boiler will repeat the ignition sequence if a heat demand
is present.

User’s 7
8. FAULT CODES
DISPLAY CODE ON BOILER DESCRIPTION ACTION

F1 Low Water Pressure 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).

Flame Loss
F2
1. Check other gas appliances in the house are working to confirm 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).

F3 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

F4 L4 warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty

period. In IE contact a Registered Gas Installer (RGII).

F5 L5
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

F6
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).

F7
Low Mains Voltage Contact a qualified electrician or your electricity provider.

Unconfigured PCB Unconfigured/faulty PCB or gas valve short circuit. Please contact Ideal (if under

F9 L9 warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty

period. In IE contact a Registered Gas Installer (RGII).

Flow Temperature Overheat Check system water pressure is between 1 & 1.5bar on the system pressure gauge.

L1 or No Water Flow 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. In IE contact a Registered Gas Installer (RGII).

Ignition Lockout 1. Check condensate Pipe for blockages (refer to Section 4)

L2 2. Check other gas appliances in the house are working to confirm 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).

L6 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).

5 Boiler Resets in 15 minutes 1. Turn electrical supply to boiler off and on.

LC 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).

Negative Differential If the boiler fails to operate then please contact Ideal (if under warranty) or alternatively

FA Flow/Return Thermistor a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a
Registered Gas Installer (RGII).

FU
Flow/Return Differential > If the boiler fails to operate then please contact Ideal (if under warranty) or alternatively
50°C a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a
Registered Gas Installer (RGII).

Diverter Valve in mid-position

U
Rotate all knobs fully clockwise, turn boiler power off and on then press restart.
for service