Lighting Your Boiler; Turning Off Your Boiler; Points To Check If Burner Fails To Light; Domestic Hot Water System - Grant Combi 70 V3 User's Installation Manual

3 - COMBI V3, COMBI MAX and VORTEX COMBI USER INSTRUCTIONS
3.1 Lighting your boiler (see Fig. A or B)
1 Ensure that - There is sufficient fuel in the supply tank
and all fuel supply valves are open, the water supply is
on, the electricity supply to the boiler is off, the Boiler
On/Off switch is set to OFF, the Heating switch is set to
TIMED, the black pointer on the pressure gauge is not
below the red pointer, the room thermostat (if fitted) is
at the desired setting and the timer is correctly set.
2 Switch on the electricity supply to the boiler.
3 Set the On/Off switch to ON.
4 The boiler will light automatically to heat the water
stored in the boiler.
If the timer is set to an 'on' period the boiler will
continue to run to provide central heating. If a hot
tap is opened the boiler will supply hot water.
3.2 Turning off your boiler (see Fig. A or B)
For short periods - Set the On/Off switch to OFF.
To restart, simply set the switch to ON.
For long periods: Set the On/Off switch to OFF and
switch off the electricity supply to the boiler. If
required, the fuel supply valve may be closed and the
water and electricity supplies turned off at the mains.
To restart, refer to the full lighting instructions above.

Points to check if burner fails to light

3.3
1 Check that the boiler On/Off switch is set to ON.
2 Check that the timer is working and is in an 'on' period.
3 Check that all thermostats are set to the desired
setting and are calling for heat.
4 Check if the burner 'Lock-out' reset button is lit. If it
is, press it 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 that the fuel
supply valve is open.
5 Ensure that a fuse has not blown or that the
electricity supply has not failed.
6 Check to see if the overheat thermostat has operated
(see note 4 in Section 3.6).
7 Check that the black pointer on the pressure gauge
is not below the red pointer.
8 If the heating system water pressure falls below 0.2
bar the boiler low pressure cut-out switch will
activate and an amber neon on the control panel
(see Fig. A or B) will light. The system must be
recharged 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.
6 Combi V3, Combi Max and Vortex Combi models
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.
3.4

Domestic hot water system

The boiler will supply domestic hot water whenever a
hot tap is opened, providing the Boiler On/Off switch
is set to ON.
Note: The Vortex Combi Store switch must also be set
to 'ON' for hot water to be supplied.
The flow of water from the taps (hot or cold) depends
upon the mains water pressure, and in some homes it may
not be possible to use more than one tap at the same time.
3.5 Sealed central heating system
The boiler operates on a sealed central heating system which
will have been pressurised by your Installer. He will have set
the red pointer on the pressure gauge (see Fig. A or B), to
indicate the system pressure (when cold) usually between
0.5 and 1.0 bar. Do not adjust this pointer. The black pointer
indicates the actual system pressure which will increase
slightly when the boiler is operating. If the black pointer falls
below the red pointer (when the boiler is switched off and
cold), you should contact your Service Engineer to re-
pressurise the system. If the system requires frequent re-
pressurising, ask your Service Engineer to check the heating
system for leaks.
If the heating system water pressure falls below 0.2 bar
the boiler low pressure cut-out switch will activate and
an amber neon on the control panel (see Fig. A or B)
will light. The system must be recharged 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.
The boiler is fitted with an automatic air vent which
removes air trapped in the boiler. Any air trapped in
the radiators needs removing by venting the radiators
using the vent screw at the top of the radiators. Only
vent a radiator if the top is cool and the bottom is hot.
Excessive venting will reduce the system pressure, so
only vent when necessary and check the system
pressure as mentioned above.
Note: Your sealed system may incorporate a 'Top-Up'
vessel, advice on how to use it should be obtained
from your Installer.
The boiler is fitted with a safety valve to release
excess pressure from the system. If 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.