Biasi
Prisma 24/SE Prisma 28/SE, Biasi 24S Biasi 28S
| Problem | Solution |
| Boiler on with no demand | The DHW microswitch can stick causing boiler to fire up and heat to go round radiators |
| burner on/off cycling | clean venturi in fan, these can get dirty and cause issues |
| Spark but no ignition | Faulty air pressure switch can have strange effects on igntion, normally causing a weak spark Honeywell gas valve can stick, should be 80-120 Volts AC between top and bottom pins on igntion box |
Biasi HE M96.24, M96.28, Garda HE, Parva HE, Riva Compact HE
| Problem | Solution |
| PCB Faults | This PCB is standard across several variants of boiler and gives several faults if not set up to the boiler correctly 1. No hot water - PCB has not been programmed to be a combi boiler 2. No heating - these come set at 24kW and the output has to be changed by a series of button presses, ring Biasi for more info |