How do I set the boiler to Summer Mode?
Press the heating mode button, then keep pressing the down arrow key until the summer mode symbol appears in the display, then press OK to save. In summer mode, the heating pump and central heating are switched off, but DHW supply and power supply for heating controls and timer remain active. The summer mode symbol will be permanently displayed on screen. (Page 11)
From the official Worcester Greenstar 1000 GR1000W 30C NG Boiler manual, page 11
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