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I have a Bosch rd532i and recently it's stated to experience several random problems. I have noticed that the pressure has been increasing rapidly over 12-14 hours going from 1.5bar to over 3. I have releived the pressure at least 3 times over the past week. Checked the filling loop and it is not passing.
The other fault I have is, when switching on the CH, temperature rises rapidly on the display, exceeds 88 degrees and then cuts out. Can then take hours to get the heating back on and work out what is happening with the system.
During all of these faults, no fault codes appear.
I have had 1 gas safe engineer (mate) which to be honest are a bit lost with the faults to my surprise.
Please can anyone point me in the right direction on how to resolve the boiler faults?