I would say this house is 5000 square ft Did you do a heat loss calc If your going modulating boiler your probably best to addover radiate the home so.TYPES OF BOILER. What follows is a simple, but detailed explanation of the different boiler types generally available.Click here for Idiots GuideTriangle Tube CC105 82,000 BTU Output Challenger Combo Boiler Space Heating Domestic Hot Water.Model DRF, WRF and WRF 30ppm NOx Forced Draft Water Boiler also known as DF WF Operating and Maintenance Manual Designed and Manufactured in Accordance with.Dodgy old boiler.So, yesterday, we woke up thinking, gosh, its a bit fresh this morning.Then, when we went into the bathroom, and felt the chill, and heard the clicking sounds, we realised our boiler wasnt working.Its a Potterton Profile 5.When we did our kitchenbathroom extension, we had it moved into a new airing cupboard, where it looks like this The problem on this particular day was that the main gas burner wouldnt light.It has an internal fan which would spin for about three seconds, then click to a stop.Then spin up again.Cost To Install Condensing Boiler Diagram' title='Cost To Install Condensing Boiler Diagram' />And stop.And so it repeated, without igniting.We had to go to the shops yesterday, and when we came back, it had come back to life, so we thought phew and didnt worry so much.Then this morning, it didnt come back to life.We had exactly the same symptoms about 3 4 years ago, when the boiler last stopped working.We paid about 1. I took a look at the troubleshooting chart in the installation guide and it pointed towards the gas valve as the culprit, but that looked fairly new, and it seemed unlikely to stop and start again, so I wasnt convinced by that.Then I realised that the chart presumed that you were starting from scratch.Yet the pilot light was already lit on ours.I extinguished the pilot, and tried to relight.This time, nothing.Just the fan cycling.The pilot light stayed out.Based on this, the chart said to replace the electronic control board a 4.PCB apparently. This wasnt good news.Even on e. Bay, they cost over 1.Given this was the second time our boiler had broken down, we were beginning to wonder whether we should bite the bullet and fit a new condensing boiler something like a nice Worcester Bosch Greenstar.The downside would be having to stump up anything from 1,5.And quick. Gulp. Feeling rather glum, I did a bit more optimistic googling, and found a couple of interesting articles.One described the same problem exactly, and confirmed the PCB as the problem.Then I noticed lots more articles on howtomendit.Potterton circuit boards.The phrase design flaw comes to mind.One of these articles struck gold.Again it described the problem, but this time one of the respondents had stripped down his control board, and concluded that the most likely way for it to fail is with three electrolytic capacitors.The thing with electrolytic capacitors is that they contain electrolyte a liquid which slowly evaporates until they fail.Normally this is a slow process many years, but of course, if you heat a liquid it evaporates quicker.Its lucky that boilers are so cold, isnt it Oh, wait.Heres the nub of the article I found.You replace the three capacitors, and see what happens.I did it. It cost me 8.Maplin on a Sunday.Tony Taunton, I salute you.If youre reading this especially because you googled something like Potterton Profile fan problem, or fan cycles, wont light, doesnt ignite etc, Ill describe what I did as a list, with a few pictures, and quote the relevant bit of Tonys original post for the detail.Apparently its the same circuit board in a Potterton Prima too, so this maybe relevant if you have one of those.Obviously, this is only a job for the competent user of a soldering iron, who understands what 2.V mains electricity can do. Download Hack Zing Speed Phien Ban Moi Nhat . I dont encourage anyone to do this.All information published on this site is used entirely at the site visitor or users risk.No warranties are expressed or implied.Do not DIY with gas.It can kill you and others, and incompetent works can invalidate home insurance.Turn off the electricity supply to the boiler before you start.Remove the cover at the bottom it slides forward you may need to remove a screw from the base first Just below the main thermostat at the front is a screw, which you undo to release the bottom panel to access the electrics.The 4. 07. 67. 7 control board is the pcb with a black cover towards the back.Detach the two block connectors at the front.This leaves five wires at the front left which you need to loosen at their far ends.Unclip the green and yellow earth lead, and remove the blue neutral lead from its terminal after unscrewing.Unclip the brown lead from the back of the overheat sensor, and the two white leads from the back of the main thermostat dont worry about which way round those two go.Top tip take a couple of digital photos as you go to remind you where to reconnect later, if youre not sure.Finally, gently release the white electrode wire, sideways from the back left of the board unlike the others it looks like its soldered, but it is a friction fit.Now you can ease the whole board off its four plastic mounts.Youll probably need to squeeze the top of each post with some narrow nosed pliers.After wiping off the grime, this was mine Lift off the black cover you may need to cut off any glue on the underside, and youll see this Oh no, Ive invalidated my warranty.Ive circled the three capacitors which I replaced.Tony wrote The electrolytic capacitors have a marked on the board, and you must observe this.C4 and C7 were 2.F at 6. 3v and C6 was 4.The 6. 3v is important dont get any lower voltage.Get high temperature 1.Use as fine tipped and hot a soldering iron as you can, to minimise heating of the components themselves.Whip out the old ones, and put in shiny new ones.While I was at it, I freshened up some of the other solder joints.Probably not necessary, but I figured I may as well.Reassembly is, as they say, the reverse of disassembly.So, with that, I powered up, turned on the hot water stat, turned up the boiler thermostat and after a few seconds, I had warm, blue, burny goodness, and my bank account karma was much improved.So, this is a public record of how I saved myself some money.Remember that I checked the official Potterton troubleshooting guide first to convince myself that this was the cause of my boiler failure.Please dont explode your house trying to do this.Bear in mind that a faulty repair could invalidate your home insurance.Landlords and employers are legally obliged to use a registered CH engineer for all gas work.If it doesnt work for you, please dont ask me to buy you a new control board.Instead, blame the stupid design which put heat sensitive components next to a very hot place, and consider it a couple of quid worth a punt.On the other hand, if you do try this and it works, Id love you to comment to let me know that it helped.There should be a link nearby.Comments are now closed.Thanks to all who contributed.Edit After about 6 weeks Im delighted this has already saved hundreds of pounds for people.If you have a blog, please mention this link to spread the word If its saved you the cost of a replacement boiler and youd like to express your thanks with a donation secured by Pay.Pal to support my hosting costs, itd be very welcome.Ill donate 5. 0 of your contributions to National Energy Action, the UKs leading fuel poverty charity, campaigning for warmer homes it seems like an appropriate cause.Edit 1. 11. 12. Steve found a completely different PCB with the same number.He took a photo which Im posting with his kind permission in case its useful to others.As usual, click to enlarge Edit 132.John B fixed his Potterton Netaheat boiler suffering similar symptoms.His boiler has a 4.PCB, and hes kindly let me post some pictures of this circuit board, as well as give details of the Maplin part numbers required.Ive posted that separately here.Edit 2. 252. 00. Registered gas engineer Chris points out that faulty gas works, if causing an accident, may mean that your home insurance would not pay out.I agree. Do not DIY with gas.Thats what Gas Safe registered engineers are for note that CORGI registration is not a legal indicator of competence since 1 April 2.I dont believe that repairing a removable PCB constitutes gas works under the Gas Regulations, but you may think differently, in which case, just call a professional.Edit 662. 01. 0 Over 1.Wow Thanks again for all the valuable comments and contributions.Edit 1. 962. 01. Over 2.Honestly not what I expected.Im closing comments today, as this post is three years old now, and most new comments ask for advice with specific problems.I cant give advice, as Im not qualified to do so.As Ive done above and in the comments below, I suggest you look at the troubleshooting chart in the installation guide to help identify the fault.
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