Oil Boiler Pressure Gauge fluctuating?
I have had a new Worcester Bosch Oil Condensing Combi fitted (Aug 07). The installer set the red gauge at 1.5 bar, the pressure reading (black gauge)seems to fluctuate from around 1 bar when the system is cold , up to 3 bar when hot water and/or heating is on. My old oil combi (not condensing) always stayed at 1.5 bar even when cold, is this normal? or do l need to re-pressurize the system when it falls below 1.5 bar.
I have checked the sytem and radiators and there are no leaks
Alan, March 2008