Baxi 105e Please help...its cold

nigeng

Hi all
My baxi 105e Combi which has worked faullessly for 4 and a half years has stopped dead. and developed a leak to boot. Having looked at it the fuse in the wall switch and the fuse in the boiler have blown. Replaced the boiler fires up and they blow again... there is an obvious burning under the PCB so its fair to say the Board is shot.... I have ordered another and am braving the cold when I have found also a leak ... this is at the joint between the DHW pressure differential valve and the diverter manifold...the point where the two are held together by two grub screws.....I am quite capable of removing and replacing these or parts of these but could do with an idea of what is likely to be wrong to allow water to leak at this point and if it is possibly the cause of the pcb melt down. I see each of these items has a diaphram in them ??? Please please help me if you can...I am skint and couldnt face xmas in the cold

jos22

Can't help myself but would suggest a post on this forum http://www.diynot.com/forums/index.php?sid=f9f8db02b6b81fda91142983fc943d22

justasskint

nigeng wrote:

Hi all
Having looked at it the fuse in the wall switch and the fuse in the boiler have blown. Replaced the boiler fires up and they blow again... there is an obvious burning under the PCB so its fair to say the Board is shot.... I have ordered another and am braving the cold Please please help me if you can...I am skint and couldnt face xmas in the cold

It's reminding me of what happened last year in the winter :-(

I had the same thing happen with the electric side. Mine failed reasonably harmless though, and just failed to power up the fan - it sat there flashing fan fail. Sure enough the PCB I had was burnt out around the relays going to the fan. All black and crispy on the board, and freezing cold with a few weeks to wait in the cold for an eng to come and fix it.

I fixed the board by putting new traces onto the pcb, but this isn't recommended at all (specially where it's burnt the board as you could have random new circuits which shouldn't be there made by the carbon that's left.

You may have a cooked transformer, by the sounds of the blown fuses. I pray it's not that cos you'll have a job getting a replacement tranny.

It's a nasty little board which sits sweating away inside a sealed plastic box, so it's an accident just waiting to happen. The replacement board has a surface mount CPU (like a postage stamp), and cost me around £130 (you can get em on ebay too). The new board is going fine (installed by a corgi chap who doesn't display his number - odd eh?), and the old repaired one sits in the garage awaiting a failure, cos I know it's still good in a crisis. A spare board is a good thing to have. Make sure you note or put back all the wiring right if you do delve inside.

Lots of luck m8 and a warm christmas for you I hope. It's a lousy time to be cold.

Cheers

Andy