potterton 40e main burner not coming on

[scanny]

Can anyone help i recently drained the radiators to change a small amount of pipe work it was corroding,filled the system back up bled all rads tried to put the heating on ,the main burner came on for a couple of min then went back on to the pilot light (,its an conventional system indirect water )i put the thermstat on full and full heat on the boiler still no joy ,changed the pump as it did sound dodgy also the thermocoupler but still no good.The only thing i noticed was when the boiler did come on full the pipes sounded like when a kettle boiling but no water in it any ideas

 

[McCombi]

Sounds like there isnt enough water in system after you partially drained it. I suspect either an air lock or blocked cold feed pipe.
Search the forum and there is plenty of advice on them both.

 

[scanny]

sorted it alot of air still in the system bled it from the pump

 

[scanny]

i have a problem with one radiator ,the others work fine ,just the down stairs rad its stone cold .i checked the pipes to it and they were cold to .i fully opened the lock valves and bled the rad and after a few miniutes doing it just the left hand pipe going to the rad gets warm .Do i carry on bleeding the rad or could it be blocked the other side causing it not to flow through ?

 

[plumbplumb]

turn all the other rads off so it's just the affected one open. If it's air locked to that rad it should clear it

 

[plumbplumb]

make sure you bleed system without the pump running as it can drag air in.

 

[kdoheating2011]

it sounds like system still airlocked.first thing to try now is to shut off all your other rads and just leave the problem radiater on ,it then should push through and start circulating again,once hot ,open up your other rads