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Baxi Luna HT pressure problem
We have a Baxi Luna HT 380.
About a month ago, we started getting an E119 (low pressure) fault code, and repressurized the system to alleviate the issue. All was fine for several weeks, but it happened again today. When we repressurized the system, it began to run normally, but the pressure, as indicated on the gauge increased rapidly until discharge came out of the pressure release pipe. We used the small drain valve to drop the pressure, but it the pressure quickly increased again. We turned off the supply for the DHW, and the pressure stabilized and ran the heat fine, but as soon as we open the supply for the DHW, the pressure increases, dumps water, then repeats. What can be done to solve this? Does it need to be bled somehow?