6
User Instructions
Points to Check if the Boiler
Fails to Light
Perform the following checks if your
boiler fails to light:
1. Ensure that a fuse has not blown or
that the electricity supply has not
failed.
2. Check that the boiler On/Off switch
is set to ON and that the POWER
indicator on the control panel is lit.
3. Check that the timer or programmer
is working and is in an ‘on’ period.
4. Check that all thermostats are set to
the desired setting and are ‘calling’
for heat.
5. Check the DEMAND indicator on
the control panel is lit.
6. Check if the burner ‘Lock-out’ reset
button (on the front face of the
burner) is lit. See Figure 1.
7. If it is, press in the button to start
the burner. If the burner fails to light
and goes to ‘Lock-out’ again, check
that you have sufficient fuel in the
storage tank and the fuel supply
valves are open.
8. Check that remote fire valve has not
‘tripped’. Reset if necessary.
9. Check to see if the overheat
thermostat has operated. See
Overheat thermostat under General
notes and care of your system.
10. Check the heating system water
pressure. If it falls below 0.2 bar the
boiler low pressure cut-out will be
activated, cutting power to the
burner, and the red ‘LOW
PRESSURE’ indicator on the control
panel (see Figure 2) will flash. The
system must be re-charged to
between 0.5 and 1 bar. If the
heating system loses pressure on a
regular basis then contact your
Installer to investigate the cause.
If the burner still fails to light after
carrying out these checks then a fault
exists. Switch off the electricity supply
to the boiler and contact your service
engineer.
Domestic Hot Water System
The boiler will supply domestic hot
water whenever a hot tap is opened,
provided the boiler On/Off switch is set
to ON. If a 2-channel programmer is
fitted, the Hot water setting on the
programmer must be ‘on’ for the boiler
to provide continuous hot water.
‘Night time’ Hot Water Function
This is a feature built in to your boiler
allowing a limited amount of hot water
to be drawn off during periods when
either the hot water programmer
channel is ‘off’ (for example, during the
night). When a hot tap is opened during
this period, the flow switch activates the
hot water store pump and the incoming
mains cold water is heated using
whatever heat is present in the primary
store. The burner will not fire and so the
heat in the store will gradually be used
up and the hot water temperature will
reduce with time.
If a 2-channel programmer is fitted, the
Hot water setting on the programmer
must be ‘on’ for the boiler to provide
continuous hot water when the Hot
Water switch is set to TIMED.
If the heating system water pressure
falls below 0.2 bar the boiler low
pressure cut-out will be activated,
cutting power to the burner, and the red
‘LOW PRESSURE’ indicator on the
control panel (see Figure 2) will flash.
The system must be re-charged to
between 0.5 and 1 bar. If the heating
system loses pressure on a regular
basis then contact your Installer to
investigate and rectify the cause.
The boiler is fitted with an automatic air
vent which removes air trapped in the
boiler. Any air trapped in the radiators
needs to be removed by venting the
radiators via the vent screw at the top of
each radiator. Only vent a radiator if the
top is cool when the bottom is hot.
Venting will reduce the system pressure,
as indicated on the pressure gauge, so
only vent when necessary and check
the system pressure as mentioned
above.
User Instructions
The flow of water from the taps (hot
or cold) depends on the mains
pressure, and in some homes it may
not be possible to use more than one
tap at a time.
Sealed Central Heating
System
The boiler operates on a sealed heating
system. Your installer will have
pressurised the system and set the
white pointer on the pressure gauge (see
Figure 2) to indicate a system pressure
(when cold) of usually between 0.5 and
1.0 bar. Do not adjust this pointer.
The white pointer indicates the actual
system pressure which will increase
slightly when the boiler is operating. If the
white pointer falls below the red pointer
(when the boiler is switched off and cold),
you should contact your Installer to
check the heating system for leaks.
!
NOTE
Your sealed system may incorporate
a ‘Top-up’ vessel. Advice on how to
use this should be obtained from
your installer.
The boiler is fitted with a safety (or
pressure relief) valve to automatically
release excess pressure from the
system. If the water or steam is emitted
from the end of the safety valve
discharge pipe, switch off the boiler and
contact your Installer or Service
Engineer.
The Expansion vessel air charge must
be checked annually. Failure to maintain
an adequate air charge in the vessel
may invalidate the warranty.
!
NOTE
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