Heating stopped working

[Harty084]

The pipes have been banging on the central heating system which has an open tank in the loft, therefore gravity fed. The pipes only banged when the heating came on and have been meaning to bleed the radiators!! Anyway the heating came on this morning and turned off after being on an hour, so I went to put it back on as it was cold but it wouldn't fire up. I therefore went round the house and bled all the rads, and got some air out, plus this also made the pipes bang a bit. So went to restart the boiler and it tries to fire up, then just trips out. I have a full tank of heating oil and have bled the boiler on start up, but it still just trips out. Boiler is a Grant Euroflame 70/90.
Cheers
Harty

 

[Gray0689]

I would say it's probably oil pump

 

[Harty084]

Can the pump be repaired if removed?

 

[fuzzy]

is there water in the system?

 

[Harty084]

Yep, water came out all the rads and the tank has topped back up in the loft. I did notice when bleeding the pump that usually the fuel gushes out, but it was only trickling out when the bleed screw was fully opened.

Would an airlock cause the boiler not to fire up?

 

[Centralheatking]

My take on it is that it might well be the central heating pump which has failed. Water
is heating up and not gettin round much causing the boiler to trip out.

centralheatking

 

[Harty084]

The CH pump works fine. The fuel nozzle is wet, cleaned the electrodes and checked the gap. Cleaned the fuel pump filter out. So I pressed the button again, it hums then clicks, makes another droning noise for about 5 secs then trips out, meanwhile the heating pipes bang for about 10 secs!

 

[ecowarm]

If the burner locks out because a problem with oil pump or something else, is the photocell clean? I cant see the conection with the heating pipes banging?

 

[dontknowitall]

I would say it's probably oil pump

As per this post (1st reply!) I'd go with this. Not the central heating pump, but the oil pump on the burner.

 

[Harty084]

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Have taken everything apart again. Have checked the fuel pump and it turns freely, have cleaned the photocell?