boiler will trips out when heating water

Hi all, I'm new to this forum and I'm hoping many of you have come across this before.

I have moved into a new house which has a potterton suprima boiler, I have had problems with air collecting in the rads since i moved in and also 3 of the rads have cold spots,

The header tank in the loft gets hot when the boiler is on and has at leased an 1" of silt in the bottom.

I cleaned the whole system/ header tank/ took every radiator off and wrinsed through etc.

But after refilling the system and bleeding the rads the boiler cuts out when set on hot water, it makes a hell of banging before tripping out.
I have tried bleeding the coil in the tank by undoing the actuator fittings, but its still tripping the boiler.

the boiler is 3 years old but the rest of the system is older.

anyone have any ideas, if i dont get this fixed the wife will devorce me!

Have you bled the pump?

gblades said:

Have you bled the pump?

Click to expand...

No, will try that tonight!

the heating works just no hot water, thought pump works heating?

Thanks.

When operating in hot water mode the pump is still normally used to circulate the central heating water round a closed loop. Hot water is passed through a heat exchanger.

gblades said:

When operating in hot water mode the pump is still normally used to circulate the central heating water round a closed loop. Hot water is passed through a heat exchanger.

Click to expand...

Success after bleeding more parts from the boiler to the coil in the hot water tank, I found a section of blocked pipe, its now running

Thanks all.