worcester greenstar 24i jnr making a noise like hammering

[michaeljcliff76]

Hello all i recently went to repair a greenstar 24i jnr. i replaced the burner seal which had caused the fan and wiring harness to melt an knacker it so fitted new fan and harness. Tenant then calls back saying after a while a loud drilling sound coming from the boiler. So i thought PRV is vibrating open and shut so put a new one in and re-charged expansion vessel whilst i was at it. Got a text today saying its doing it again. Of course it never makes this sound while im there. Also the rads(4 of) do seem to be very hot ,you cant keep you hand on it very long.It runs fine whilst im there but im beginning to think its getting to hot and the pressure build up is making the prv dance about causing the noise. Any ideas fellas and girls

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[SimonJohns]

Comman fault on this type of burner. Unfortunately it's a gas safe only job

If you send your details to the gods and get in the GSR forum. You may have more replys

 

[michaeljcliff76]

i am gsr

 

[Nostrum]

Presuming you've set up the gas valve using a FGA properly? I would look at replacing the bearing plate.

 

[Destroyer2813]

You've set up the ratios again after changing the fan we are presuming

 

[arran197]

Yes, they sing very loudly if the gas valve is set wrong. Eventually it'll go to lock out. Do you know how to set it?