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The 24 hour plug in timer provided can be used to provide this function. The operation pressure will rise and fall in line with temperature increase and decrease of the heating system water temperature. This is normal operation. However should the pressure fall below that set on the pressure gauge (0.5 bar) this is an indication there is either a leak in the heating system or the expansion vessel is too small for the heating system volume. You should consult your Service Engineer in order to cor