Biasi boiler died - following low pressure

Sam Russell

My Biasi (M96-28SR/C2) has just died. It shut off because the closed circuit pressure was too low (I think) but all the lights are out. The PCB is getting 230V but no sign of life anywhere.

Any ideas of what is wrong? It happened without any warning, but it has needed topping up often (more than once a month) but pressure varies greatly over time. No sign of water leak anywhere.

K.Flyer

Only binned one of the same model just before x-mass, water leaked down through the insides and destroyed the electrics and important gas components.
Not a good boiler to begin with, best to replace it if you can afford it.

Sam Russell

Got a guy out who checked everything and said PCB was fubar. Ordered a replacement which he fitted and all working.

Now I have a pressure problem so I need to fit an expansion tank. Symptom is pressure is all over the place - zero when cold and over 2 bar when hot.

nmacc

If you've paid for a new board, you're committed. I would suggest getting a regular expansion vessel of perhaps 18 litres and fitting it in the hot press or wherever it'll fit. It'll probably be cheaper than the Biasi spare part and also bigger, which is better for the system and the vessel. It will also be easier to get at to check the pressure and, if a valve is fitted in the pipe to it, you, or someone else can change it if it fails because it's no longer inside the gas boiler.

Sam Russell

Thanks for that advice. I will try and do exactly that. The new vessel will go into the hot press with a pressure gauge and stop cock.

I will check everywhere for leaks, but so far have found nothing significant but there is one in there somewhere.

Thanks for the advice.