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cant fault it its 34yrs old:giggle: old Worcester Danesmoor. its only had a few jets & 2 fuel pumps

the boilers well by its sell by date but i thought id leave it till it goes bang. To be honest I'm surprised the heat exchanger hasn't rusted through. I did pose the question to the plumber if i switch the central heating to sealed system what is the likelihood of it blowing old joints that have...

yep, originally was a gravity fed HW cylinder but that was converted about 15 yrs ago to non vented so we could get rid of the tank. The boilers been there for a good 30yrs. Pulled the hatch off to close the AAV. There is one on the return line but its closed off with the cap. Strangely enough...

I'll close it off but surely a plumber wouldn't fit it on the return line? rather than the pressure side.

yeah they flushed it as it was pretty dirty before they refilled. i mean its all pretty much straight runs with 2 off the radiators teed off. just cant understand where the noise is coming from. The boiler is "old" but there's zero problems with the heating downstairs.

the 2 pipes i showed, the bottom is straight from the expansion tank cold supply the top is the vent that goes to the expansion tank. on the right hand side there's the flow at the top and the return at the bottom????

If I'm understanding you right. On the left side of the boiler the cold feeds at the bottom & the vent is the top pipe. The reason the pumps always been on setting 1 is that even before the extension when the pumps put on 2 or 3 the TRV's bounce and i presume the only remedy would be to fit bi...

You got me thinking after you mentioned the AAV's Looking at the one at the boiler am i right that the AAV should be on the pressure side of the pump?? if that's the case its on the wrong side. I assume to close them its just a case of screwing the plastic cap in??? it appears that one is closed...

Hi, The boiler has always been in the garage and now the header tank is also in the garage so the pipe run from the boiler to tank is less. Basically the two boiler to tank connections were just rerouted from where they went through the wall to the loft to the top of the garage to where the tank...

I'll have a look and get back to you.

I'll give that a go. one is fitted right next to the burner and the other is in the room where the noise is occurring but on the opposite side of the room. The green circle area is where the sound appears to be resonating

tried it, made no difference unfortunately

yeah, i shut off the large radiator across from the small one that seems to be where the noise is focusing. I'm just surprised at how much air is still moving through the system considering its only 4 rads and there's 2 auto air vents. one on the boiler and the other after the last radiator.

no garage is lower but the expansion tank is still a few feet higher than the radiators upstairs in the house. Tank was put right up in the apex of the garage roof. you still need a 4 step ladder on the garage roof beams to reach the expansion tank. House was a bungalow built with attic trusses...

yeah, yesterday I've started putting the heating on in the morning & the afternoon to see if it happens. got up this morning and it started for an hour again. Plumber vacuum tested the new pipework before it went live to check his joints cos i did say "could it be a joint pulling air???" (press...

Hi Stuart, ball valve definitely closing off as it should.

cross thread I'll give that go.

Hi Davy, The tank is still about approx 1m above the radiator as its now in the garage as we moved from he loft. i did expect the rads to fill a little slower due to this but i checked the tank today and its full so its not drawing air in from there & we've set the fill level to max in the tank.

pumps runs on for about 5-10mins after shutdown. I'm pretty sure there's a bypass fitted on the circuit at the boiler. I'll post a pic

Hi All, Recently had a loft conversion done. 2 bedrooms and a bathroom. One large radiator in one room, bathroom has a towel radiator & the other room has one large radiator & a small one on the opposite wall. I obviously expected it would take a bit of time to get rid of the air after a...