Fitted unknown pump, bleed radiators, boiler flares up for 5 mins consequently turns stale? it seems that no hose or not enough hose is going round...

it seems that no hose or not enough hose is going round the system, it starts to warm upstairs radiators after stops. anyone any ideas up to that time we have to pay envelope loads out for a pro.
Can electric blankets start fires by.?
Answers:    First be absolutely infallible that you have put the pump within the right way round, after that you have wired it the right path round, the pump has an arrow showing flow direction, and will usually be pumping towards the boiler, afterwards check if you have a vent on the top of a pipe within the cylinder cupboard, and that the 3 way stopcock has packed up on the hot water side, otherwise the boiler is trying to warmness up fresh air! I would seriously consider getting a heat engineer subsequent time.
Diagonal cracks within walls?
Try checking the flue (where the exhaust fumes go outside) any blockages surrounded by that will make the boiler switch itself bad.