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Prepare for operation
▶ Check the system pressure on the display.
– Indicator in red zone: pressure is too low or too high.
– Indicator in yellow zone: pressure is low or slightly too high.
– Indicator in green zone: pressure is normal.
▶ Top up the heating water, if the pressure is low or too low.
3.1.2
Low pressure indication
Low pressure (shaded area [A]) will be indicated on the appliance:
• The pressure indicator is within the area between 0 and 0.79 bar in
the pressure menu display (left hand yellow and red zone).
• Additionally there is a message displayed.
Fault - 1017
System pressure
Pressure: 0.2 bar
Min
A
Fig. 3
Low pressure indication
[A]
Low pressure area
3.1.3
Constantly re-pressurising the system
Constantly having to re-pressurise the heating system should be
investigated as it is an indicator of potential leaks and the concentration
of inhibitor protection in the system will be reduced; this can result in
corrosion within the heating system, reducing efficiency and increasing
contaminates.
▶ Check for leaks on heating system (pipework and radiator valves).
▶ Contact your installer or maintenance engineer if a recurring
significant decrease or increase in pressure is shown on the pressure
indicator (pressure gauge or pressure display).
System pressure increasing:
▶ If the system pressure repeatedly increases and you need to vent air
from the radiators, refer to section 10.4 "System gassing
troubleshooting", page 14.
3.2
Semi-sealed heating system
A semi sealed heating system is filled and automatically topped up from
a header tank. There will be no filling link provided for topping up the
system.
Appliances which are suitable for use on a semi sealed system will be
capable of operating at very low system pressures, this may be displayed
as 0 pressure on the appliance display.
▶ The system will be automatically topped up, there is no means of
increasing system pressure with a filling link.
▶ The appliance will not display a low pressure fault, even if the system
is empty or fails to top up. Low water content in the system may lead
to an over-heat lockout.
▶ If you regularly have to vent air from radiators, or suspect a leak from
anywhere on the heating system this must be investigated and
remedial work carried out. Inhibitor levels must be checked and
replenished if necessary.
6
too low
Max
3.3
Topping up the system pressure
Sealed heating system
To aid in filling the system.
▶ Ensure the Central Heating is on.
Removal and replacement of bottom panel
To gain access to the filling link, remove the bottom panel.
Press in the tabs [A] and pull the bottom panel down to remove.
C
B
Fig. 4
Bottom panel
To replace the bottom panel, ensure that the tabs [B] line up with the
edges of the boiler [C] and push into place until the tabs [A] click into
place.
External filling loop
Once the external filling loop and pressure menu has been located,
follow the instructions for re-pressurising the system.
Refer to figure 5.
▶ Unscrew the blanking cap [1].
▶ Attach the hose [2] to the valve.
– Usually one end of the hose is already connected to one of the
system fill isolation valves.
▶ Ensure both ends [3] of the hose are screwed on hand tight.
▶ Monitor the pressure menu.
– The system fill isolation valves [4] are in a closed position (the
handle/screwdriver slot is across the valve).
▶ Turn the handle/screwdriver slot through 90° to open valves and
slowly fill the system.
– The system fill isolation valves [5] are opened (the handle/
screwdriver slot is in-line with the valve).
– The pressure menu indicator moves and the displayed message
may change [6].
▶ Turn the handles/screwdriver slots back, through 90°, to close the
valves when the:
– The pressure menu reads OK and the pressure menu indicator is
in the green zone [8] .
The system fill isolation valves [7] are in a closed position (the
handle/screwdriver slot is across the valve).
▶ Top up the system pressure, if as a result of the air bleeding the
pressure drops off.
Condens 4700iW – 6721864485 (2023/04)
C
A
0010036333-001
B
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Table of Contents
Troubleshooting
