PCB fault fixing

Hi all,

I just want to share my experience with PCB fixing. I had my Boilermate working strange switching on CH pump without any reason and in the end stopped starting up correctly if i power down the system. I had the same problem a year ago but after an hour being shut down it recovered.
Yesterday it started again. So i removed PCB and replaced all 5 electrolytic caps and magic - microcontroller started without any problem and system works fine.
If anyone can't resolder few caps themselves i can fix your PCB for no cost. Just send me your PCB(packed properly) with return stamped envelope and i will fix it for you for free. Of course i will accept your kind reward if you are happy with the result and willing to do that

Hi,

You've mentioned about replacing the caps on my post re intermitant hot water supply, but not sure what these are how it can fix a fauly pcb. I'm relucant to shell out for a new pcb (£240+) and can't get hold of a reconditioned one as I'm not entirley sure that this is the fault.
Thanks

Hi,
Those caps are on power rail of microcontroller and reset signal. May be on other signals, I don't have schematic diagram. So at least bad filtering on power rail can make microcontroller misinterpret signals or even misbehave the code. My faulty board intermittently switched on heating. Buttons sometime didn't work. In your case it is a bit different, but as I said you can't predict behaviour and for the sake of £6-£7 it is worth to try. I gave the list of caps in other posts and at least one forum user managed to fix the board

Hi,

Do you know where can I buy them from?

Thanks

https://gledhill-repairs.forumotion.net/t1219-continuous-heating-dead-acb#4457
Ordered from RS:
http://uk.rs-online.com/web/p/aluminium-capacitors/3150552/?searchTerm=3150552&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B367D247C5E5C647B377D247C5E5C647B31307D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D424552267573743D333135303535322677633D4E4F4E4526

Hi,

The new caps have arrived from RS. Just a quick question before I try and install them. I take it there is no polarity issues with them. Been a long time since GCSE electronics, but seem to remember that they don't have a +/- setting? Not too bad with a soldering iron, but any further tips/things to be vary of before I dive in would be appriciated.
Thanks, Mark

Mark,
They do have polarity. All of them, so check PCB and caps carefully.
Be also careful removing old caps, don't damage tracks and vias.

Hi,

I've taken the pcb board off to change the caps, but the ones on my model have 47u 25v x 2 and 10u 35v x 2, and not as your original post. It has a 220u 25v that I've now replaced. I take it I'll have to order these ones as they need to be exact? The 47u 50v & 10u 50v ones i have are now going spare if anyoe wants them.

Thanks, Mark

Hi,

Been on RS website and can find 47uF 25v caps, but not 10u 35v ones! Any idea what product code is for the ones I need are? There loads of different types and not sure what he difference is between them.

Thanks again, Mark

Mark,
You can put 50v instead of 25V. That is the maximum voltage for them. So 50v is even better. Put them without any risk. Trust me.
So the important value for cap is its capacitance and the voltage must be the same or higher. So you bought caps thich can stand higher voltage.

Hi.

I have just replaced a faulty ACB. The faulty board has a brown/black area behind the FILTANA FS 800 2147 component.

Can the FILTANA FS 800 2147 be replaced with an equivalent because I cant seem to find any for sale?

It is not pin compatible replacements
http://uk.farnell.com/jsp/search/browse.jsp?N=203358+110130340&No=0&getResults=true&appliedparametrics=true&locale=en_UK&divisionLocale=en_UK&catalogId=&skipManufacturer=false&skipParametricAttributeId=&prevNValues=203358&mm=1001880||,&filtersHidden=false&appliedHidden=false&autoApply=false&originalQueryURL=%2Fjsp%2Fsearch%2Fbrowse.jsp%3FN%3D203358%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Den_UK%26divisionLocale%3Den_UK%26catalogId%3D%26skipManufacturer%3Dfalse%26skipParametricAttributeId%3D%26prevNValues%3D203358

Hi again

I've now had a chance to replace all the caps on the board, but problem persists, or may have actually got worse, which may be down to my soldering skills and/or damaging other componants/tracts which is really annoying. Think I am resigned to buying a new pcb, say goodbye to £250.
The power still cuts out to the pump after 30/40 secs for 2/3 secs which I assume accounts for variation in output temp and LCD display bottom line lights up in accordance with above cycle. Any ideas anyone!
Thanks, Mark

Don't pay £250 !!

http://www.cetltd.com/search.asp?srch=Boilermate

Great service.

Thank you feebet

Does anyone know which part of the ACB is responsible for modulating the DHW pump voltage? Does it have a part number?

Another ACB Processor brought back to life by changing 5 caps. Thanks

This solution worked for me. Got my capacitors from Maplin.

zmiceruk wrote:This solution worked for me. Got my capacitors from Maplin.

I replaced all the capacitors on the board and made no difference but I now believe the fault is with the boiler thermistor. I've listened to the system running and when the boiler senses that the water is at its required temperature, the burner shuts down and the fan continues to run for a few seconds. Then the boiler circulation pump in the boilermate continues to run for hours. When the boilermate has reached its satisfied temperature (sometimes before the boiler), it shuts down the boiler without the burner shutting off before the fan and the boiler circulation pump then stops running correctly after around 3 minutes.

I have modified the system so it's timer controlled but this only works when the heating isn't in use. it's an appalling, inefficient design.

http://www.gledhill-spares.net/documents/bm2000-iss10.pdf

Page 35 on the manual, link above, explains how to check the system temperatures and sensors using SW2. This might help you understand what is happening.

Regards Murray