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Discuss Boiler Heat Exchanger busted in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Suzan

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Hi guys,

Quick question. Had 2 new rads fitted (system was drained) but I didn't test the hot water or heating after he fitted the rads. 4-5 days later I noticed there was no hot water (wasn't in the house) and I kept hearing clanging sounds after the boiler has tried to ignite then shutdown. Only rad that got hot when heating was turned on is one above boiler, rad in the room next to it got a bit hot when i turned the first one off but not fully hot. Plumber came round and said f&e tank was contaminated and when the system got drained, sludge may have gone into the system and caused the heat exchanger in the boiler to overheat. He cut the boiler off from the gas and just labeled it not usable.

So I have a couple of options. I was gonna go with buying a combi boiler that will require the system be drained and flushed anyway, and he said the current boiler is beyond repair because the heat exchanger is expensive.

I saw on ebay a refurb for £55, and I'm thinking, can we not just power flush the system, then install the new heat exchanger, make sure the f&e tank has no gunk, and all good? Or is this a bad idea? This is a vented system btw. Picture of boiler is attached (worcester bosch greenstar 24 ri)

IMG-20190610-WA0004.jpeg
 

Riley

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First things first who took the cover off the boiler for the picture
 

Riley

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And how much did they charge you for that callout ??
 
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Suzan

Suzan

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He cut the gas to it, and just put a sticker on the boiler.

IMG-20190610-WA0010.jpeg
 

Riley

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That is cheap for them. So let me get this straight they came out replaced the radiators for you? Stirred up a load of muck in the system and then cut you off saying the boiler is unsafe. I would be more inclined to think it’s an airlock if some of the radiators are getting some warmth
 
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Suzan

Suzan

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No i got a gasman previously to come out and install 2 rads. Few days later i realised there was no hot water or anything. My mate thought it was an airlock but we bled all radiators, no air. Some radiators were indeed getting warm, but warm on the top, not the bottom.
 
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Suzan

Suzan

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And f&e tank had muck apparently that may have got into the pipes. Heat exchanger as you can see from the picture is pretty screwed.
 

Riley

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So there is a likelihood that there is some sludge stirred up, but if they are getting warm that means that the boiler is producing heat ?? Why did you not get the initial plumber back?
 
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Suzan

Suzan

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My OH got fed up with the situation and just called this other plumber... a "proper" plumber from a company...
 

Riley

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Well For a start I would be complaining to Pimlico as an airlock or sludge in the system does not warrant treating the boiler as immediately dangerous and cutting the gas. My point still remains though if the radiators are getting warm then the boiler is producing heat albeit badly. Tried shutting off all radiators bar one and forcing the heat to that. I would still be inclined to think that it’s air
 
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Suzan

Suzan

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Can't do too much now as he cut the gas pipe .. :\ I was doing what you said above until that plumber came round and cut everything.
 

Riley

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Get on the phone to them and complain. Ask them how they’ve got to the answer of immediately dangerous
 

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