Discuss Need Advice about Boiler and Central Heating Repair Please in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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Hi. I'm having some issues with my boiler / central heating and have enlisted a local 'Combi Heating Specialist' to sort it out but he seems to be making things worse. I really need another expert's opinion, to put my mind at rest, or help me make the decision to stop using his services.

I live in a house built in the 1980's and we have a 'Logic Combi 3' boiler with radiators in every room. Around a month ago I noticed that there was a small, slow drip coming from heating pipe of the filling loop. Also, I've been needing to top up pressure 1-2 a month for a while. Everything was working fine and a large bowl catching the drips took around a month to fill, so I wasn't really bothered.

But we're thinking about selling the house eventually and so though best to get it sorted.

Local guy came along, had a look and told me he could replace a part and put sealant in the boiler to fix the issues and would send a quote for what needs doing.

We received a bill for: "Re-charged expansion vessel. Quote to be sent re replace sump cover"

Then we received the quote: "decommission and remove existing sump cover. Supply and fit replacement. Add two doses of leak sealant to the system"

Immediately after he'd been and "re-charged expansion vessel" I guess, the pressure became much, much worse. From topping it up 1-2 a month, to 1-2 a day every day. I waited a week for him to return and a couple of days before he was due to come, one of the downstairs radiators began to drip, very slowly from a pipe.

He came back and I told him about the pressure being worse and he told me it was because of the dripping radiator downstairs, which he fixed simply by tightening a bolt! He went to the boiler and came back with a photo of a black component (sorry I have no idea what it is), telling me it has a hairline crack in it and it will cost around £500 to replace. He said it might be cheaper to get a new boiler. He told me that he was going to add the sealant but that the leak would not be fixed. Off he went.

Soon I realised that 3 radiators were not working (unfortunately, 2 of them my kids bedrooms). I called the company and they sent someone around. The new guy told me that when the first guy had half-emptied the boiler, he must have moved some sludge, which was now blocking the radiators. He then told me that my radiator pipes were the wrong size and they might need to take the floor up and replace the pipes. He suggested a power flush.

So, that's it. I've gone from the minor annoyance of a slowly dripping boiler pipe and topping up pressure monthly, to half my central heating not working and a scary amount of work needing doing.

The good news is that my pressure is fine and the leaking boiler pipe has stopped. All I need is my radiators working again.

Please, if anyone with expertise can tell me what they think of all this, I'll be most grateful. I have no idea if this is all just bad luck and one of those things or I have incompetent plumbers.

Thanks
Ian
 
They do have a problem with there dumps cracking as there only plastic the parts around the 100 mark and they around 2 hours to do the job ish if you Google it quite a common issue note not a diy repair

I highly doubt there blocked from him just draining the boiler so likely to be something else could be air locked

Try closing all of the radiators via there trv except one of the problem ones and turn the heating on and wait 10 mins so see if it gets warm and if it does repeat for the rest

Sounds like you best avoid that company and try and find another one that’s decent
 
They do have a problem with there dumps cracking as there only plastic the parts around the 100 mark and they around 2 hours to do the job ish if you Google it quite a common issue note not a diy repair

I highly doubt there blocked from him just draining the boiler so likely to be something else could be air locked

Try closing all of the radiators via there trv except one of the problem ones and turn the heating on and wait 10 mins so see if it gets warm and if it does repeat for the rest

Sounds like you best avoid that company and try and find another one that’s decent
Thanks for replying, really appreciate it.
 
I completely agree with @ShaunCorbs - get someone else. Imo sounds like they’re creating work to generate income, although the sump bit could be true. If all is now well with you’re boiler, then good. As for the rads, could be trapped air, they might need bleeding, or could be air-locked as per Shaun. Do they heat up whatsoever?
 
I completely agree with @ShaunCorbs - get someone else. Imo sounds like they’re creating work to generate income, although the sump bit could be true. If all is now well with you’re boiler, then good. As for the rads, could be trapped air, they might need bleeding, or could be air-locked as per Shaun. Do they heat up whatsoever?
The rads that have stopped working are completely cold, including the pipes on either side.
I've turned all off besides one of the cold ones but it's not heating. Should I try bleeding them all?

One thing that makes me nervous about these guys is that the first guy said that the pressure was dropping more after his first visit because of the leaking radiator but the second guy said the pressure deterioration was because they had to increase the pressure to .2 on the first visit to get a reading of the problem or something like that.

Thanks for your help, I'll pay them for what they've done and seek out a new guy with a good reputation (even though these guys have very good reviews on their website)
 
Ok, the ones that aren’t heating, do they have thermostatic radiator valves (TRV’s)?
2 of them do, 1 doesn't.
We have 2 rads with missing TRV's, one of them is the not working one and the other I turned off by using the right side to shut it off completely.

So the only rad that is on right now is the one which is not working, without a TRV valve. All others are either turned off with TRV or with bolt on right side. Central heating is on but rad not heating up and pipes on sides are cold.
 
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I think that possibly rules out stuck pins then.

Leave all others, and open up one that is known to work and leave the one without the trv open on both sides. Report back as to whether it heats at all, including the pipes.
 
I think that possibly rules out stuck pins then.

Leave all others, and open up one that is known to work and leave the one without the trv open on both sides. Report back as to whether it heats at all, including the pipes.

Done. Yeah def not stuck pins as the 3 that are not working all stopped at same time on the day that the guy added leak sealant. We do actually have a rad with a known stuck pin but I'm ignoring that one.

Here's the rad which the guy said has a too small pipe which needs replacing. The pipes are same size on every rad though. Is he correct? It's about 10mm

pipe1.jpg
 
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