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Legend

A. Boiler ON/OFF switch.
C. Display.
D. Reset button.
E. LED.
F. CH thermostat knob.

BOILER CONTROLS

Introduction

The istor HE260 & HE325 are fully automatically controlled,
condensing, system store, fan flued boilers.
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 the plastic waste pipe at the lower rear of the boiler.
A condensate 'plume' will also be visible at the flue terminal.
The istor is a system store boiler providing both central heating
and domestic hot water.

S a f e t y

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 CORGI registered installer, 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 (boiler)

This appliance must be earthed.
Supply: 230 V ~ 50 Hz. The fusing should be 3A.
Connection must be made in a way that allows complete
isolation of the electrical supply such as a double-pole switch,
having a 3mm (1/8") contact separation in both poles, serving
only the boiler and system controls. Alternatively, a 3-pin
UNSWITCHED socket may be used. The means of isolation
must be accessible to the user after installation.

Electricity Supply

(immersion heater)

Supply: 230 V ~ 50 Hz. The fusing should be 13A.
The immersion heater is supplied fitted to the cylinder and is
intended for use as a back up heat source for DHW should the
boiler fail for some reason. Optimum DHW performance will not
be achieved using the immersion heater only.

istor

G.C. Appliance No.

HE260 ...... 41-394-13

G.C. Appliance No.

HE325 ...... 41-394-14

(Natural Gas only)

Destination Countries: UK, IE

Wire the heater through a double-pole switch or controller,
having contact separation of at least 3mm, using a cable size
of at least 1.5sq. mm flexible cable, 85

C rubber insulated

HOFR Sheathed, complying with BS6141 Table 8. It MUST be
fully earthed. Ensure all terminal connections are securely
made. Do not however use excessive force when tightening
terminals.

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 CORGI registered installer.
Under NO circumstances should any of the sealed
components on this appliance be used incorrectly or
tampered with.
This appliance is not intended for use by persons (including
children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless
they have been given supervision or instructions concerning
use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not
play with the appliance.

In cases of repeated or continuous shutdown a CORGI
registered installer should be called to investigate and rectify the
condition causing this and carry out an operational test. Only the
manufacturers original parts should be used for replacement.

Minimum Clearances

Clearances of 165mm (6

1/2

") above, 5mm (1/4") at the sides

and 450mm (17 3/4") at the front of the boiler casing must be
allowed for servicing.

The minimum front clearance allowed when built into a
cupboard is 5mm.

All CORGI registered installers carry a CORGI ID card, and have a registration number. Both should be recorded
in the Benchmark Commissioning Checklist. You can check your installer by calling CORGI direct on 01256 372300.

THE BENCHMARK SERVICE INTERVAL RECORD MUST BE COMPLETED AFTER EACH SERVICE

Ideal Stelrad Group is a member of the Benchmark initiative 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.

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CAUTION.

To avoid the possibility of injury during the installation, servicing or cleaning

of this appliance care should be taken when handling edges of sheet steel components.

To light the boiler.

Refer to Frame 1

Refer to the programmer section of these instructions to set the
required programs.

1. CHECK THAT THE ELECTRICITY SUPPLY TO THE BOILER

IS OFF.

2. Set the mains ON/OFF switch (A) to OFF and CH thermostat

knob (F) to maximum.

3. Ensure that all DHW taps are turned off.

4. Switch ON the electricity supply to the boiler and check that

all external controls, e.g. programmer, room thermostat etc.,
are ON.

5. Set the mains ON/OFF switch to ON.

The boiler will commence the ignition sequence, first supplying
heat to preheat the domestic hot water and then to the central
heating, if required.

Note. In normal operation the control unit display (C) will show
codes:

Standby - no demand for heat.

CH being supplied.

DHW being supplied to reheat the cylinder.

Boiler frost protection.
Note. Boiler frost protection occurs under the following
conditions:

1. Temperature less than 5 degrees, pump will run.
2. Temperature less than 3 degrees, boiler will fire.

During ignition, the LED (E) will flash.

During normal running the LED (E) will remain illuminated.

Note.

If the boiler fails to light after 3 attempts the fault code

will be displayed.

Press the reset button (D) for 2 seconds then release. The
boiler will repeat the ignition sequence. If the boiler still fails to
light consult a CORGI registered installer.

O per ati o n

Winter conditions - i.e. CH and DHW required.

The boiler will fire and supply heat to the radiators but will give
priority to DHW on demand.

The DHW will operate as described under 'Summer conditions'
during periods when there is no call for CH.

Summer conditions - i.e. DHW only required.

Set the CH external controls to OFF, or turn the CH thermostat
knob (F) to minimum.

The boiler will fire periodically to maintain the DHW cylinder in a
preheated condition and whenever there is a demand for DHW.

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

Approx. flow temperatures for the
boiler thermostat settings are:

Central Heating

Knob Setting

CH Flow

Temp

C (

Max

82 (180)

Min

30 (86)

Control of water temperature

Domestic Hot Water

The DHW delivery temperature is controlled by thermostatic
mixer within the tank module (see illustration below).

Pull off the lower door from its locating pegs and adjust the
mixer valve to the required DHW delivery temperature.

IMPORTANT
60

C is the recommended maximum temperature.

Central Heating

The boiler controls the central heating radiator temperature to a
maximum of 82

C, adjustable via the CH thermostat knob (F).

Index

Mark

ist8999

Domestic Hot Water

Knob

DHW

setting

Temp

Min

Max

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To shut down the boiler

1. For short periods

Set the mains ON/OFF switch (A) to OFF

2. For longer periods

Set the mains ON/OFF switch (A) to OFF, and switch the
electricity supply to OFF. For longer periods the entire
system should be drained.

To relight the boiler

Repeat the procedure detailed in 'To light the boiler'.

Frost protection

If no frost protection is provided and frost is likely during a short
absence from home, leave the heating controls (if fitted) at a
reduced temperature setting. For longer periods, the entire
system should be drained.

If the system includes a frost thermostat then, during cold
weather, the boiler should be turned OFF at the time switch (if
fitted) ONLY. The mains supply should be left switched ON, with
the boiler thermostat left in the normal running position.

Boiler overheat thermostat

This thermostat will shut down the boiler in the event of
overheating. Should this occur a fault code will be
displayed. Press the reset button (D) and the boiler will relight.

If the fault recurs, turn off the boiler and consult a CORGI
registered installer.

Flame failure

Should this occur a fault code

will be displayed.

Press the rest button (D) and the boiler will relight.
If the fault recurs, turns off the boiler and consult a CORGI
registered installer.

Loss of system water pressure

The gauge (see illustration below) 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 is indicated. In this event a CORGI registered
installer should be consulted.

DO NOT FIRE THE BOILER IF THE PRESSURE HAS
REDUCED TO ZERO FROM THE ORIGINAL SETTING.

Condensate Drain

The condensate drain must not be modified or blocked.

Blockage of the condensate drain, caused by debris or freezing,
can cause automatic shutdown of the boiler.

If freezing is suspected and the pipe run is accessible an
attempt may be made to free the obstruction by pouring hot
water over the exposed pipe and clearing any blockage from the
end of the pipe. If this fails to remedy the problem the
assistance of a CORGI registered installer should be sought.

Escape of gas

Should a gas leak or fault be suspected contact your local gas
supplier without delay.

Do NOT search for gas leaks with a naked flame.

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
CORGI registered installer.

ist9027

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Channel 1

(Radiator symbol) relate to the CH programme

Channel 2

(Tap symbol) relates to the DHW programme.

1. To set the time and day.

Move the right sliding switch to 'RUN'.
Press the 'HR' and 'MIN' simultaneously for 2-3 seconds.

Set the day button using the 'DAY' button.

Set the time pressing the 'HR' and 'MIN' buttons.

Approximately 15 seconds after setting the time and day the
display will automatically pick up the time of day (the colon
between the hours and minutes will flash).

To set the CH programme.
Set the right sliding switch to the radiator symbol.

Note. There is an in built default programme of:

Mon-Fri

6:30

OFF

8:30

ON 16:30

OFF 22:30

Sat-Sun

7:00

OFF

9:00

ON 16:00

OFF 23:00

(An ON period is designated by a 'light bulb' symbol being
present in the top right hand corner of the display).

Pressing the 'DAY' button allows the selection of:
Mon - Sun

Separate days

Mon - Fri

Inclusive

Sat - Sun

Inclusive

Mon - Sat

Inclusive

Mon - Sun

Inclusive

Press the 'P' button to scroll through the ON and OFF times.

Press the 'HR' and 'MIN' buttons to change any of the pre-set
times.

To save the desired times move the right sliding switch to RUN.

3. To set the DHW programme.

Set the right sliding switch to the tap symbol.

Note. The default programme is as the CH programme

above, changing the times again is as above.

To save the desired times move the right switch to RUN.

4. To delete a switching time on CH or DHW

Set the right sliding switch to the radiator or tap symbol as
required. Use button `P' to flag up the desired switching time,
Then press button '

' and P simultaneously for 3-4

seconds. The display will show a flashing 0.00 and the
switching point is deleted.

5. To operate the programmer.

Set the right sliding switch to RUN.

Set the left sliding switch to AUTO.

An ON period will be designated by a light bulb symbol in the
top right hand corner of the display with either a '1' to
designate CH programme ON or a '2' to designate DHW
programme ON.

6. Manual Override CH.

To manually override the CH programme move the left
sliding switch to 'I'.

Press the '

' button ONCE.

The No. '1' will flash in the display for approximately 3
seconds, after which a light bulb symbol will appear in the
display and the '1' will stop flashing.

To cancel the override move the left sliding switch to AUTO
after approximately 3 seconds the '1' and the light bulb
symbol will disappear.

7. Manual Override the DHW.

To manually override the DHW programme move the left
sliding switch to 'I'.

Press the

button TWICE.

The No. '2' will flash in the display for approximately 3
seconds, after which a light bulb symbol will appear in the
display and the '2' will stop flashing.

To cancel the override move the left sliding switch to AUTO
after approximately 3 seconds the '2' and the light bulb
symbol will disappear.

8. Skip Function

Pressing the '

' button ONCE for CH or TWICE for

DHW with the left sliding switch in the AUTO position will
change the programmed switching until the next programme
time is reached.
i.e. this function will turn an ON period to OFF and vice versa.
A '1' or '2' will appear in the display along with the light bulb
symbol and '

To remove this function press the '

' button ONCE to

select '1' (CH) and hold in for approximately 3 seconds.

The '1' or '2' along with the light bulb and '

' symbol will

disappear.

PROGRAMMER SET UP

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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 - TYPICAL NON PRODUCT FAULTS

Problem

Solution

Boiler is not working for
central heating or hot water.

Check there is power to the boiler switch (A) in the ON position and `0' displayed on the
controls.

If `0' not displayed then not a boiler fault contact your installer/service company.

Check integral programmer is set to an `ON' period and the relevant function selected i.e.
central heating or domestic hot water. Test by overriding the programmer by setting to
`continuous. (refer to user instructions).

Check room thermostat for central heating is set at the required temperature. To test
operation turn fully up. If no response contact your installer.

Boiler is not working for
central heating or hot water
and the display shows `L:A

L:A

L:A '

(flashing).

Press reset button (D) for 2 seconds, the boiler should then re-light. If fault recurs this
indicates an overheat condition. The boiler should be turned off and your installer contacted.

Check if ALL radiators have thermostatic radiator valves fitted. If they have contact your
installer.

Check for air locks in the boiler or system pipework. Vent air from radiators press reset
button (D) and then release. The boiler should relight, if the fault recurs turn off the boiler
and contact your installer.

Boiler is not working for
central heating or hot water
and the display shows `H:A

H:A

H:A '

(flashing).

Check pressure gauge on boiler shows a minimum of 1 bar. In order to view the
pressure gauge it will be necessary to remove the lower front panel (refer to installation
instructions).
If not re-pressurise via the filling loop to 1 bar (if unsure contact your installer), turn off the
tap on the filling loop and turn the on/off switch (A) off and then back on again to reset the
boiler. If unable to do so or if the pressure continues to drop after filling then contact your
installer.

Check if ALL radiators have thermostatic radiator valves fitted. If they have contact your
installer.

Boiler is not working for
central heating or hot water
but attempts to fire by going
through 3 ignition attempts.
Display shows `L : F

L : F

L : F ' (flashing).

Press reset button (D) for 2 seconds to repeat ignition sequence.

Check gas supply (try another appliance cooker/fire etc.) If no gas supply then not a
boiler fault contact gas supplier.

Check condensate pipe is not blocked or frozen. If blocked clear blockage if not possible
to check contact your installer.

Domestic hot water is not to
the required temperature

Adjust the mixing valve to the required output temperature see user instructions for
temperature settings - In order to access the mixing valve it will be necessary to
remove the lower front panel (refer to installation instructions).

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