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Does a 3/4 hose connector like one in image fit to end of a spiro filter drain off ?

Thanks. Getting chemical in tonorrow. I suspect its on the return in blue on diagram.

Vent pipe getting hot but no water coming out when there today. It did the other day though. So thinking its a partial blockage maybe ?

The feed isc15mm from f .n e. Yes thete a separate 22 mm vent pipe over f n e.. Yes check copper t as much as could. It seems OK . I'm.going bang some sentinel x400 in. Can this go in and just run on hot water as the heating not on everyday.? Thanks

When engineer fitted 3 port he told me the heat or hot water never worked. He never got in loft to bung tank so likely dropped the f n e pulling in air. He then backfilled the system from the drain off in picture. The banging was there prior. Do you think its possible sludge has been pushed out...

Yes only since 3 port was changed.. It does appear to be hw problem I think. If it is blocked coil or restricted on return from cylinder this sounds very problematic. Can chemical clean it ?

So I went today. Cleaned f n e out. Changed gate valve to a new ball vall. Replaced t and wet vax pipes. Water dropping from f n e no problem. The t was not that much blocked ( picture attached ). Upon turning hot water/ heating on the feed pipe got hot again but there no block. What else...

If I already have a spiro at boilor ( can hardly service its that tight) . This magna is mainly to dose and fit Magnaclense is it OK on flow ? Or would it just be batter dosing chemical from radiator and connecting magnaclense to radiator. ( although not as easy as to filter )

I think you may be right. The return is not visible in cylinder cupboard

There no more pipes apart from ones in image

There no room at the boilor the pipes are tight to the ceiling

Is this return ( In blue) 'm not up on identifying on heat only. Combi would not be a problem . Thanks

Was going to just catch it with folding bucket and / wet vax. Do not really wanna drain out lower incase block although unlikely is elsewhere or don't get block out and has a nightmare for some reason back filling. Just feel more comfortable doing it this way .

First time fitting on a heat only system. Just want to be sure before start . Got no problem with bunging f n e and vent. Isolating water and wet vav ing the remainder water in pipe so no water when cut it. But I think I have got the flow and return arrows wrong way. Return is after pump going...

Sorry for confusing. It's spinning free left and right stopping each way. Maybe partially blocked at T then water taking path of least resistance up the feed. I think I'll bung the tank. Isolate water to f n e. Then clean f n e. After that open the t conpression and check if blocked. Do you...

I can remove the front box to get at gate valve. Few screws amd the full piece of ply comes of. I recently got a engineer to change 3 port valve. I think he may amd shut gate valve but unsure and maybe its stuck shut. Althoug the handle is spinning freely. Do you mean unlikely the gate valve...

To fit a Ady filter on return

I used magnetbat the t today although it was only a fridge magnet as I was waiting for a more powerfull magnet to gdt delivered. Which it has today. So will try the t again tomorrow. If the magnet does not stick to the t tomorrow. Do you think I should check the gate valve first ? I'm thinking...

Today put thermal camera on and it's obviously hot on feed. Got in loft to look at f n e. Ball valve was working. But the feed was bubbling. I suspecting block on the t or faulty gate valve. Thermostat is new and 3 port valve. Controls OK and turning pump off. What you think. Block feed and...

In my picture below have I identified correct for flow and return pipes ? Thanks in advance