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- 22 Feb 2004
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Potterton Puma 100e "died" yesterday - no lights or response. There was a funny hot electrical smell round the boiler.
Mains fuse (3 amp) ok but internal 2 amp glass fuse blown. Checked inside and found main modultion board badly charred at the edges round the top left corner. I removed the board.
Burning had clearly happened at the soldered pin connectors and 2 of these were completely burnt out. Worst charring at the live and neutral mains connection. Also milder burning on pins connecting fan, air pressure switch, pump and "full sequence control panel" (these are in descending order of severity and also increasing distance from mains connection pins). Silver tracks on the board also burnt but charring concentrated at pin solder points.
Board is obviously beyond repair and must be replaced. However, I don't know if the board burnt out due to bad solder joints - as often discussed on this forum (I resoldered 1 bad 240 volt solder joint about 2 years ago) - OR if a fault elsewhere caused the problem. If a fault elsewhere (eg fan) can I test this with the board out of the boiler, using a meter, and if so how and what should I look for?
Really grateful for any avice. I will call an engineer if necessary but would prefer not to.
TIA
Martin
Mains fuse (3 amp) ok but internal 2 amp glass fuse blown. Checked inside and found main modultion board badly charred at the edges round the top left corner. I removed the board.
Burning had clearly happened at the soldered pin connectors and 2 of these were completely burnt out. Worst charring at the live and neutral mains connection. Also milder burning on pins connecting fan, air pressure switch, pump and "full sequence control panel" (these are in descending order of severity and also increasing distance from mains connection pins). Silver tracks on the board also burnt but charring concentrated at pin solder points.
Board is obviously beyond repair and must be replaced. However, I don't know if the board burnt out due to bad solder joints - as often discussed on this forum (I resoldered 1 bad 240 volt solder joint about 2 years ago) - OR if a fault elsewhere caused the problem. If a fault elsewhere (eg fan) can I test this with the board out of the boiler, using a meter, and if so how and what should I look for?
Really grateful for any avice. I will call an engineer if necessary but would prefer not to.
TIA
Martin