Wiggum Posted January 8, 2017 Report Share Posted January 8, 2017 We have a Glow worm 100e combo fitted and recently we've noticed that the hot water isn't as hot as it used to be it's especially noticeable when having a shower and if we run a bath you can't run the hot tap full bore or the water is luke warm, after doing abit of research online I think I've narrowed the cause down to the plate to plate heat exchanger but wondered if we have any heating engineers on here who can think of another explanation? I'm considering maybe replacing the boiler with another combi in the summer can anyone suggest anywhere that supplies Combi's cheap looking at a 30kw ideal or similar thanks Quote Link to comment Share on other sites More sharing options...
bullet1747 Posted January 8, 2017 Report Share Posted January 8, 2017 I had the same problem few years back , I hired a pump and flushed the boiler for a few hours the exchanger was blocked with **** , then fitted a inline filter job sorted Quote Link to comment Share on other sites More sharing options...
Wiggum Posted January 8, 2017 Author Report Share Posted January 8, 2017 I'm thinking the same probably full of lime scale ? I may remove and descale and see if it makes a difference before spending too much money on it. Quote Link to comment Share on other sites More sharing options...
Twistedsanity Posted January 8, 2017 Report Share Posted January 8, 2017 Had the same with my.old.combi and it was always scale in the heat exchanger, whipped it out and bathed it in acid a few times which helped a little but the best bet is to swap it out, either buy a pattern part which is cheaper or look at the manufacturers website, most manufacturers of all things electrical.and mechanical will do a fixed price repair, I think our old one cost £130 and that was all labour and parts from.a trained engineer who carried spares, that was a few years back but it's worth a look Quote Link to comment Share on other sites More sharing options...
TaxiDriver Posted January 8, 2017 Report Share Posted January 8, 2017 (edited) It's one of the downsides of modern more fuel efficient boilers - they're simply carp We had our boiler changed for a new Carlos fandango Combi and lost our hot water cylinder, Now you can't run a bath coz the water in the bath goes cold whilst running the hot water tap slow enough to be heated properly and we can run the shower full chat on just the hot water tap alone. Edited January 8, 2017 by TaxiDriver Quote Link to comment Share on other sites More sharing options...
CaptainBeaky Posted January 9, 2017 Report Share Posted January 9, 2017 (edited) Clean out the heat exchanger. Fit a water softener - by which I mean a proper ion exchange softener that uses salt, not one of the snake-oil magnetic or electronic jobbies. Set up the softener to give 10-20ppm hardness, and make sure you keep the salt topped up. No more problem with blocked hws heat exchanger. Edited January 9, 2017 by CaptainBeaky Quote Link to comment Share on other sites More sharing options...
Winston72 Posted January 9, 2017 Report Share Posted January 9, 2017 It's one of the downsides of modern more fuel efficient boilers - they're simply carp We had our boiler changed for a new Carlos fandango Combi and lost our hot water cylinder, Now you can't run a bath coz the water in the bath goes cold whilst running the hot water tap slow enough to be heated properly and we can run the shower full chat on just the hot water tap alone. Your boiler is not set up properly then Quote Link to comment Share on other sites More sharing options...
CaptainBeaky Posted January 9, 2017 Report Share Posted January 9, 2017 Your boiler is not set up properly then +1Or undersized. Quote Link to comment Share on other sites More sharing options...
Doc Holliday Posted January 9, 2017 Report Share Posted January 9, 2017 I would get a competent engineer in to go over it and check things like thermistor resistance in Ohms to see if it correlates to the temperature it's sensing. Also, gas pressures will have a bearing. They need to be checked at min & max and set accordingly. I'd do these before swapping out the plate heat exchanger. The fault needs to be proved before throwing parts at it hoping it will sort it. Quote Link to comment Share on other sites More sharing options...
Tim Kelly Posted January 9, 2017 Report Share Posted January 9, 2017 90% of the time it is the plate heat exchanger being blocked though, either by limescale or sludge. Quote Link to comment Share on other sites More sharing options...
mossy835 Posted January 9, 2017 Report Share Posted January 9, 2017 We have a Glow worm 100e combo fitted and recently we've noticed that the hot water isn't as hot as it used to be it's especially noticeable when having a shower and if we run a bath you can't run the hot tap full bore or the water is luke warm, after doing abit of research online I think I've narrowed the cause down to the plate to plate heat exchanger but wondered if we have any heating engineers on here who can think of another explanation? I'm considering maybe replacing the boiler with another combi in the summer can anyone suggest anywhere that supplies Combi's cheap looking at a 30kw ideal or similar thanks i find the same with mine. Quote Link to comment Share on other sites More sharing options...
Winston72 Posted January 9, 2017 Report Share Posted January 9, 2017 I would get a competent engineer in to go over it and check things like thermistor resistance in Ohms to see if it correlates to the temperature it's sensing. Also, gas pressures will have a bearing. They need to be checked at min & max and set accordingly. I'd do these before swapping out the plate heat exchanger. The fault needs to be proved before throwing parts at it hoping it will sort it. Most sensible advice posted, if boiler diagnostics could be solved by forum guessing , we'd be out of a job Quote Link to comment Share on other sites More sharing options...
Wiggum Posted January 9, 2017 Author Report Share Posted January 9, 2017 Thanks guys I will get someone in to take a look Quote Link to comment Share on other sites More sharing options...
Twistedsanity Posted January 10, 2017 Report Share Posted January 10, 2017 Phone the manufacturer not Pete the plumber from down the road, plumbers are qualified to work on boilers which doesn't mean they know the inner workings Quote Link to comment Share on other sites More sharing options...
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