What the manual says
Manufacturer manualThe boiler has a call for hot water but the appliance has reached the desired temperature set on the boiler.
From this model's manual
Verified against the Ideal Gb24 Gb30 installation & service manual, page 6.
DIY fix possible
Check your hot water temperature dial on the boiler front panelTurn up the dial if you require hotter waterObserve if the code clears once you start using a hot tap
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