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Mend Vaillant Fault Heating Switched

vaillant fault code f7.5?

Hi,
just tried putting the heating on for the first time this year & F7.5 came up on the display. Switched boiler off then back on (turned heating off) & could get hot water from the tap, assoon as i put the heating on the fault came up again.
Anyone know what this fault code is please?

freezing cold
October 2009
VaillantHeating, Home Heating SystemsFault Heating Switched
I think you mean f.75, if so this is a problem with the pump and/or water presure sensor, its more than likely that the pump has seized and needs freeing up. contact an engineer or you will get wet trying it yourself

sicknote
October 2009
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