GENERAL INFORMATION
TR05A140.B1107
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1.2 Topping up the system (Error Code H20)
If the water pressure in the central heating circuit falls below 0.3 bar, the boiler will go to lock out (stop
working) and Error Code H2O will appear on the display. This could be caused be a leak in the system,
if air is bled from a radiator or if a radiator is replaced. The system will then need to be topped up.
To top up the system:
• Let the boiler and radiators cool down;
• Connect the filling loop (usually located near the boiler);
• Open the filling loop valve (or valves);
• Fill the system until the pressure gauge (located on the underside of the boiler) reads 1 bar;
• Switch the boiler off then on again using the ON/OFF button on the Control Panel;
• Check that Error Code H2O is no longer shown on the Control Panel display;
• Close the filling loop valve (or valves) and disconnect the filling loop.
The boiler should now fire and continue to work normally.
If a lot of water was required to fill the system (such as after a radiator is replaced) it may be necessary
to repeat the process a few times over a period.
1.3 If you smell gas
• DO NOT operate any electric switches, telephones or any other equipment that may cause sparks;
• Open doors and windows immediately to create a current of air and ventilate the room;
• Shut off the main gas supply valve (either at the meter or on the cylinder in the case of bottled gas);
• From a safe location, telephone the following 24 hour gas emergency numbers:
Great Britain 0800 111 999
Northern Ireland 0800 002 001
Republic of Ireland 1850 20 50 50
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