there is a leak somewhere, water has to be leaving the system.
leave a bucket in place under the vent pipe, see does it catch any. filling to 3bar is way too high, 1bar max, cause pressure rises as water heats up. If it is rising from 1bar to 3bar when heating is on, safety valve is surely liftling letting water out vent pipe (as it is designed to do at and over 3bar) and a sure sign that your expansion vessel is knackered.
T
March 2008
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