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I would be inclined to just give the system a good flush through then after manually latching the diverter valve in mid position refill it very very slowly by tying up the ball cock to let the water trickle down through the F&E tank and down through the cold feed, this should/may allow air to vent up through the vent and still allow water down the same vent pipe, thats how I refill mine but I have a service 1/2 ins isolating valve on the cold feed to the F&E tank, I have no AAVs anywhere in the system and can run the circ pump at any speed I like with never a sign of air. Maybe also blank off the vent as suggested even if only temporarily.
Your system sounds as if still full of air but you are getting no proof of this when venting/bleeding the rads, weird.
 

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While I'm in there I would like to fit a magnetic filter.
However I do not have access to the boiler return feed as that is under the floor.

Magnaclean state it cannot go on to the flow, I'm assuming this is due to having isolation valves which someone could accidentally close stopping the boiler venting? Are there any of these units that can be fitted to the flow, such as the Fernox Omega?
 
Just going on a different tack, (pump cavitation), what is the distance (approx) from the water level in the F&E tank to the pump?.
 
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Hi All,

I'm not being one of those that solves an issue and doesn't return with an update so posting a quick update.

I put some X400 in a couple of weeks ago, I left it in there and the system is definitely getting quieter, I'd say its 85% better!
I will leave it a bit longer till it's been in there 4 weeks, then drain it down and fill it with X100.

However we are having a few people out to quote for a new boiler, as this seems to be playing up and having a few failed start ups/cycling happening.
 
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Just want to say that I’ve just seen this post and read through it.

It was a good read, you gave great details and a concise breakdown.

If you ever need a job, I’d hire you 🙂
 
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Just want to say that I’ve just seen this post and read through it.

It was a good read, you gave great details and a concise breakdown.

If you ever need a job, I’d hire you 🙂
Thanks for your reply it made me smile 🙂

I'm an electronics/industrial control/electrical engineer and I'm in the process of looking at a change of career as it goes! I've been looking at courses for Gas Safe/Boiler repair and domestic electrical.

The industry I've worked in has gradually disappeared and nothing is repaired any more, it was thriving in this area with lots of electronic work but all the major manufacturers closed all the factories.

Now I'm self employed and it's getting more difficult each day. So time to start again and go down another path.

My parent inlaws had an issue with their Worcester 25Si and could not get an engineer out for days, they are elderly and were going to be without heating/hw.

The first engineer misdiagnosed it and I explained what I thought the issue was, the second engineer turned up with the wrong parts as I expected. I spoke to him and said the wireless thermostat receiver is faulty and the hw issue is down to the heat exchanger plate. He actually listened, ordered those parts and it's all working. Both of them said there is a lack of engineers around here and that got me thinking, I might look in to doing some courses and getting qualified if there is work out there and someone would take me on.

Im thinking as I have an electronic, electrical and mechanical background that could help.
 
Thanks for your reply it made me smile 🙂

I'm an electronics/industrial control/electrical engineer and I'm in the process of looking at a change of career as it goes! I've been looking at courses for Gas Safe/Boiler repair and domestic electrical.

The industry I've worked in has gradually disappeared and nothing is repaired any more, it was thriving in this area with lots of electronic work but all the major manufacturers closed all the factories.

Now I'm self employed and it's getting more difficult each day. So time to start again and go down another path.

My parent inlaws had an issue with their Worcester 25Si and could not get an engineer out for days, they are elderly and were going to be without heating/hw.

The first engineer misdiagnosed it and I explained what I thought the issue was, the second engineer turned up with the wrong parts as I expected. I spoke to him and said the wireless thermostat receiver is faulty and the hw issue is down to the heat exchanger plate. He actually listened, ordered those parts and it's all working. Both of them said there is a lack of engineers around here and that got me thinking, I might look in to doing some courses and getting qualified if there is work out there and someone would take me on.

Im thinking as I have an electronic, electrical and mechanical background that could help.
From this post, I think you’ve got a good chance to make it, if you put the effort in and are prepared to drop wages while you’re learning.

I’ve got a friend who owns a smallish plumbing company who lives out in Pembrokeshire (saw your profile said South Wales). If you fancy having a chat with him and maybe going out with him/one of of his guys for a trial day or two (to see if you do fancy it), I can ask if he’s willing/got space for an apprentice?
 

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