4LegendA. Domestic Hot Water Preheat On/Off KnobB. Domestic Hot Water Temperature KnobC. Central Heating Temperature KnobD. Mode KnobE. Boiler StatusF. Burner ‘on’ IndicatorG. System Pressure GaugeH. Central Heating Economy SettingGBoiler BaseE FA B C DHTO START THE BOILERIf a programmer is fitted refer to separate instructions for theprogrammer before continuing.Start the boiler as follows:1. Check that the electricity supply to boiler is off.2. Set the mode knob (D) to ‘off’.3. Set the Domestic Hot Water temperature knob (B) andCentral Heating temperature knob (C) to ‘max’.4. Set the preheat knob (A) to ‘preheat on’.5. Ensure that all hot water taps are turned off.6. Switch on electricity to the boiler and check that all externalcontrols, e.g. programmer and room thermostat, are on.7. Set the mode knob (D) to ‘ ’ (winter).The boiler will commence ignition sequence, first supplyingheat to preheat the domestic hot water and then to the centralheating, if required.Note. In normal operation the boiler status display (E) will displaymessages (see section 7).Note. Boiler frost protection - boiler will fire if temperature is below 5ºC.During normal operation the burner on indicator (F) will remainilluminated when the burner is lit.Note. If the boiler fails to light after five attempts the followingfault messages will be displayed “Ignition Lockout” -“1 Check other gas appliances work” - “2 Restart boiler” -“3 Contact Installer”.To restart boiler, turn mode knob to restart position andimmediately turn knob back to required setting. The boilerwill repeat the ignition sequence. If the boiler still fails to lightconsult a Registered Gas Installer, or in IE a Registered GasInstaller (RGII).2. BOILER OPERATION