What the manual says
Manufacturer manualThe boiler is operating in domestic hot water preheat mode.
From this model's manual
Verified against the Ideal Instinct2 24 installation & service manual.
DIY fix possible
No action is required as this is a normal operational message.If you wish to stop this mode, locate the preheat button or setting on the control panel to toggle it off.Monitor the display to see it return to its normal status once the preheat cycle completes.
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