Powermax 155 Boiler

[Berwyn007]

recently i drain the systems to change a radiator in the bathroom, i allowed the system to refill from the tank in the attic. on completion of the boiler refilling the boiler locked out and would not ignite

any Ideas on how to fx this problem ??

[The Builder]

Most likely just air in the system Berwyn - have you bled all the rads?

[terence7556]

are u in a modern home with stud walls? my son is, with a powermax 140 open vented, and has a drain valve on every downstairs rad. so its necessary to drain every valve.
also did u drain the two pumps on the boiler, the heat exchanger pump and ch pump.
take out the centre disc, thesize of a ten p piece, with a towel ready to catch cos its hot and also u might drop it down one of those fiddly little holes where its difficult to retrieve it.this is while u have called for heat so the pump is running.
i have done it so often that i can balance the disc on a large screwdriver to insert it.
this all takes some time, its not a five minute job and if u lose enough water u might consider topping up your inhibitor
good luck