Keston System S30 User Guide

User Manual: Keston System S30 User Guide

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System s30
User Guide
FAN POWERED HIGH EFFICIENCY
MODULATING DOMESTIC CONDENSING
GAS SYSTEM BOILER

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 Keston.
For the very latest copy of literature for specification and maintenance practices visit our website
www.keston.co.uk where you can download the relevant information in PDF format.

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
Efficient 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

INTRODUCTION

The Keston 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 efficiency of the boiler, condensate is produced from
the flue 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 flue 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.

Minimum Clearances................................................... 4

It is essential that the instructions in this booklet are strictly
followed, for safe and economical operation of the boiler.

Escape of Gas............................................................. 4

ELECTRICITY SUPPLY

Cleaning...................................................................... 4

This appliance must be earthed.
Supply: 230 V ~ 50 Hz. The fusing should be 3A.

Maintenance................................................................ 4
6. Points for the Boiler User......................................... 5
Troubleshooting........................................................... 5
7. Normal Operation Display Codes............................ 6

IMPORTANT NOTES
•

This appliance must not be operated without the casing
correctly fitted 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.

8. Fault Codes................................................................ 7

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

User’s

BOILER OPERATION

Legend
A.
B.
C.
D.
E.
F.
G.
H.

CH temperature control
Mode Control Knob
Boiler Status
Burner ‘on’ indicator
Function Button
Restart Button
Pressure Gauge
Central Heating
Economy Setting

BOILER
OFF

BOILER
ON

ºC
ON
MIN

MAX

RESTART

C E D

TO START THE BOILER

EFFICIENT HEATING SYSTEM OPERATION

If a programmer is fitted refer to separate instructions for the
programmer before continuing.

The boiler is a high efficiency, 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.

Start the boiler as follows:
1. Check that the electricity supply to boiler is off.

5. Set the mode knob (B) to ‘BOILER ON’.

The boiler condenses water from the flue gases when
operating most efficiently. To operate your boiler efficiently
(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.

The boiler will commence ignition sequence, supplying heat to the
central heating, if required.

Reducing the room thermostat setting by 1ºC can reduce gas
consumption by up to 10%.

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.

Note. In normal operation the boiler status display (C) will show codes:

Standby - no demand for heat.
Central Heating being supplied

Boiler frost protection
- boiler will fire 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 five attempts the fault code L 2
will be displayed (refer to Fault Code page).
To Turn Off
Set the mode knob (B) to ‘BOILER
A OFF’.
E

CONTROL OF WATER TEMPERATURE

WEATHER COMPENSATION
When the Weather Compensation option is fitted 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
B weather, the boiler should be turned OFF at the programmer
(if fitted) ONLY. The mains supply should be left switched ON,
with the boiler thermostat left in the normal running position.

The boiler controls the central heating radiator temperature to a
maximum of 80oC, adjustable via the central heating temperature
knob (A).

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 fitted) at a reduced temperature setting.
For longer periods, the entire system should be drained.

Approximate temperatures for central heating:

BOILER RESTART

Knob Setting

Central Heating Radiator Temperature (approx.)

Minimum

30ºC

Maximum

80ºC

For economy setting ‘
Operation.

User’s

’ refer to Efficient Heating System

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.

CONDENSATE DRAIN

GENERAL INFORMATION

This appliance is fitted 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:

BOILER PUMP

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
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 flow. 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 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
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.

The boiler pump will operate briefly as a self-check once every 24
hours, regardless of system demand.

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 0800 111 999.
Ensure that;
- All naked flames 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 finish 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).

4. Once the blockage is removed and the condensate can flow
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).

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 filling loop to 1 bar (if unsure contact
your installer). Turn off the tap on the filling loop and press the
“RESTART” button to restart the boiler.
If unable to do so or if the pressure continues to drop after filling
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.

User’s

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
NO CENTRAL HEATING

NO HOT WATER

Check the mains power is turned on
and ensure mode control knob (B) is
in the ON position

Check the mains power is turned on
and ensure mode control knob (B) is in
the ON position

Check the programmer (external to
the boiler) is in an “ON” position and
the room thermostat is turned up

Check the programmer (external to the
boiler) is in an “ON” position and the hot
water cylinder thermostat is turned up

Does the boiler operate and provide
central heating?

YES

Does the boiler operate and provide
hot water?

YES

Check the time settings on the
programmer are as you require and
adjust if necessary

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)

FOR ANY QUERIES PLEASE RING THE
KESTON CONSUMER HELPLINE : 01482 498660
NOTE. BOILER RESTART PROCEDURE To restart boiler, press the “RESTART” button.
User’s

NORMAL OPERATION DISPLAY CODES

DISPLAY CODE ON BOILER

00
54

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.

FP
--

The boiler is operating in frost protection.

The boiler mode knob (B) is in the off position, rotate fully clockwise for hot water and central
heating operation.

User’s

FAULT CODES

DISPLAY CODE ON BOILER

DESCRIPTION

ACTION

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
Keston (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

1. Check other gas appliances in the house are working to confirm a supply is present in
the property.

Fan Fault

Flow Thermistor

Restart the appliance - if the boiler fails to operate then please contact Keston (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

Outside Sensor Failure

Low Mains Voltage

Contact a qualified electrician or your electricity provider.

Unconfigured PCB

Unconfigured PCB. Please contact Keston (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 Temperature Overheat
or No Water Flow

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
Keston (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 3)

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 Keston (if under warranty) or alternatively a Gas Safe Registered
Engineer if outside of the warranty period. In IE contact a Registered Gas Installer
(RGII).
Restart the appliance - if the boiler fails to operate then please contact Keston (if under
warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty
period. In IE contact a Registered Gas Installer (RGII).

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 Keston (if under warranty) or alternatively a Gas Safe Registered
Engineer if outside of the warranty period. In IE contact a Registered Gas Installer
(RGII).
Restart the appliance - if the boiler fails to operate then please contact Keston (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

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

Flow/Return Differential >
50°C

User’s

2. If the boiler fails to operate please contact Keston (if under warranty) or alternatively
a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a
Registered Gas Installer (RGII).
If the boiler fails to operate then please contact Keston (if under warranty) or alternatively
a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a
Registered Gas Installer (RGII).

FAULT CODES
DISPLAY CODE ON BOILER

DESCRIPTION

ACTION

BCC Activation Fault

Restart the appliance - if the boiler fails to operate then please contact
Keston (if under warranty) or alternatively a Gas Safe Registered
Engineer if outside of the warranty period. In IE contact a Registered
Gas Installer (RGII).

BCC Fault

Unconfigured PCB

Restart the appliance - if the boiler fails to operate then please contact
Keston (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 Water Pressure

Check system pressure is between 1 & 1.5bar on the pressure gauge.
If the boiler fails to operate then please contact Keston (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

See Action - Fault Code L 2

Fan Fault

Restart the appliance - if the boiler fails to operate then please contact
Keston (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
Keston (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
Keston (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
Keston (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 qualified electrician or your electricity provider.

Unconfigured PCB

Please contact Keston (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/Return Reversed

Please contact a Gas Safe Registered Engineer. In IE contact a
Registered Gas Installer (RGII).

Flow Temperature Overheat
or
Unconfigured PCB

Check system pressure is between 1 & 1.5bar on the pressure gauge (if fitted
to a sealed system). If the boiler fails to operate then please contact Keston
(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

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 Keston
(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 Restarts in 15 minutes

1. Turn power off and on at the fused spur.
2. If the boiler fails to operate please contact Keston (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
Keston (if under warranty) or alternatively a Gas Safe Registered
Engineer if outside of the warranty period. In IE contact a Registered
Gas Installer (RGII).

Keston Heating, PO Box 103, National Avenue, Kingston Upon Hull, HU5 4JN
Tel. +44 (0) 1482 443005 Fax. +44 (0) 1482 467133.
www.keston.co.uk
Keston pursues a policy of continuing improvement
in the design and performance of its products.
The right is therefore reserved to vary specification without notice.

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