24s

My mom has a Biasi M90B 24S, (construction year 2009), previously she had several problems with this combi boiler, every now and then it needed a HE cleaning, sometimes CH wasn't operating, other times HW. Lately she experienced the following: - How water through the taps came in waves: hot for...

Biasi 24S, about 10 years old. All mechanical parts appear OK (pump, fans, valves etc). Boiler fires on demand of heating or DHW but has become progressively cooler in DHW output, and the heating is now struggling. Flames look good, sys' pressure is OK, but temp' gauge rises to only 30C at about...