Valiant combie boilers? q friday the bloody thing showed a fault .. f32 no hot...

q friday the bloody thing showed a fault .. f32 no hot dampen . got the plummer in he did somin and said he needed another factor .. hot water now.. problem is the pressure guage keep going up water keeps comming out the pipe. and i still maintain having to relive the pressure by letting out yet more marine ... whats wrong with the thing? do not want to phone the plummer on a Sunday!!
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Answers:    Sounds approaching the filling loop has be left open.
Look for a metal braided hose in close proximity the pressure gauge and close the plastic lever so its a cross the hose. There might be one or two.
Set the pressure to around 1 bar.
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If its not the innards loop then it could be that the expansion vessel needs recharged next to air,or it might be burst.There is also the possibility that the the plate heat exchanger have a weak spot in the weld,allowing mains water into the heat circuit,forcing up the pressure.