My combi boiler pressure drops to 0 about 3/4 times a week , when I top it up the radiators heat straight away perfectly fine , my first thoughts were there must be a leak in the pipework but wouldn't the radiators be empty and need aired again etc any ideas ?cheers
you must make sure your Crossflow on your boiler is working that indicates it has a ball valve or a turn switch also water pressure can drop depending on number of households using water which will lower the pressure or you have to simply do is refill the boiler or seek Update Service
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It might be a problem with the automatic pressure relief valve (blowoff) or if there is no leak, the radiators are fully purged and the automatic air valve on top of the boiler is okay then I'd be looking at possible expansion vessel failure
Pressure dropping is due to a leak, possibly from rad or internal of boiler.