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Unfortunately not still under warranty and as for the guy that install it no where to be found and yes thermostat right in cheers

Any one out there please help me I have a grant vortex e21 external combi boiler that loses pressure once a day I have replaced expansion vessel PVR all auto air vents but the PVR just dips once its hot the pressure never goes over 2 bars but I cant seem to turn down the temperature you cant put...