Biasi Riva Plus HE M296.24 SM/C boiler not working correctly. Symptoms were as follows (same at heating and hot water):
After quick investigation I found out that it is circulation problem that causes this boiler to overheat and shut down. Possible culprits to this situation are: failling pump or scaled/blocked main heat exchagner. It is worth noting that sometimes similar symptoms can happen with faulty PCB, thermistors, overheat stats or wiring. In this case it was however a major component at fault.
Faulty part was quickly identified and replaced the same day.
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Biasi Riva repaired and working correctly.