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Fix small leak in central heating system?

My (new) oil combi boiler loses pressure from 1 bar to 0 in about 24 hrs showing I have a weep in the system pipework somewhere. Can't see evidence of leak in surface piping or valves. There is a small section of underfloor piping where I suspect leak might be. Is there a system additive (like rad seal) to stop leak?

Dave Wooden
October 2009
Heating, Home Heating SystemsBoiler Heating Pipework
There is a liquid you can buy from a plumbers merchants to put in the water but I would advice you not to put it in a combi system,it is ok for low pressure (tank) systems it could cause damage to your boiler ,better to get someone to repair it.

Glen
October 2009

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Oil Boiler Losing Pressure - Leak Repair